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0704.0203	August A. Muench, Charles J. Lada, K. L. Luhman, James Muzerolle and Erick Young	A Spitzer census of the IC 348 nebula	We present a Spitzer based census of the IC 348 nebula and embedded star cluster. Our Spitzer census supplemented by ground based spectra has added 42 class II T-Tauri sources to the cluster membership and identified ~20 class 0/I protostars. The population of IC 348 likely exceeds 400 sources after accounting statistically for unidentified diskless members. Our Spitzer census of IC 348 reveals a population of protostars that is anti-correlated spatially with the T-Tauri members, which comprise the centrally condensed cluster around a B star. The protostars are instead found mostly at the cluster periphery about 1 pc from the B star and spread out along a filamentary ridge. We find that the star formation rate in this protostellar ridge is consistent with that rate which built the exposed cluster while the presence of fifteen cold, starless, millimeter cores intermingled with this protostellar population indicates that the IC 348 nebula has yet to finish forming stars. We show that the IC 348 cluster is of order 3-5 crossing times old, and, as evidenced by its smooth radial profile and confirmed mass segregation, is likely relaxed. While it seems apparent that the current cluster configuration is the result of dynamical evolution and its primordial structure has been erased, our findings support a model where embedded clusters are built up from numerous smaller sub-clusters. Finally, the results of our Spitzer census indicate that the supposition that star formation must progress rapidly in a dark cloud should not preclude these observations that show it can be relatively long lived.	What is the title of this paper? TO APPEAR IN THE ASTRONOMICAL JOURNAL Preprint typeset using L ATEX style emulateapj v. 08/22/09 A SPITZER CENSUS OF THE IC 348 NEBULA AUGUST A. M UENCH1, CHARLES J. L ADA1, K. L. L UHMAN2,3, JAMES MUZEROLLE4& E RICK YOUNG4 Submitted November 20, 2006; Accepted March 30, 2007; Version October 25, 20
0704.0204	Marco G. Pala, Michele Governale, J\"urgen K\"onig	Non-Equilibrium Josephson and Andreev Current through Interacting Quantum Dots	We present a theory of transport through interacting quantum dots coupled to normal and superconducting leads in the limit of weak tunnel coupling. A Josephson current between two superconducting leads, carried by first-order tunnel processes, can be established by non-equilibrium proximity effect. Both Andreev and Josephson current is suppressed for bias voltages below a threshold set by the Coulomb charging energy. A $\pi$-transition of the supercurrent can be driven by tuning gate or bias voltages.	What is the title of this paper? arXiv:0704.0204v2 [cond-mat.supr-con] 29 Aug 2007Non-Equilibrium Josephson and Andreev Current through Interacting Quantum Dots Marco G. Pala1, Michele Governale2, J¨ urgen K¨ onig2 1IMEP-MINATEC (UMR CNRS/INPG/UJF 5130), 38016 Grenoble, Fra nce 2Institut f¨ ur Theoretische Physik III, Ruhr-Univer
0704.0205	P. Esposito, A. Tiengo, A. De Luca, F. Mattana	Discovery of X-ray emission from the young radio pulsar PSR J1357-6429	We present the first X-ray detection of the very young pulsar PSR J1357-6429 (characteristic age of 7.3 kyr) using data from the XMM-Newton and Chandra satellites. We find that the spectrum is well described by a power-law plus blackbody model, with photon index Gamma=1.4 and blackbody temperature kT=160 eV. For the estimated distance of 2.5 kpc, this corresponds to a 2-10 keV luminosity of about 1.2E+32 erg/s, thus the fraction of the spin-down energy channeled by PSR J1357-6429 into X-ray emission is one of the lowest observed. The Chandra data confirm the positional coincidence with the radio pulsar and allow to set an upper limit of 3E+31 erg/s on the 2-10 keV luminosity of a compact pulsar wind nebula. We do not detect any pulsed emission from the source and determine an upper limit of 30% for the modulation amplitude of the X-ray emission at the radio frequency of the pulsar.	What is the title of this paper? arXiv:0704.0205v2 [astro-ph] 11 Apr 2007Astronomy& Astrophysics manuscriptno.7480 October24,2018 (DOI:will beinsertedbyhandlater) Discovery of X-ray emissionfrom the youngradiopulsar PSRJ1357−6429 P.Esposito1,2, A.Tiengo2, A.DeLuca2,and F.Mattana2,3 1Universit` a degli Studi di Pavia, Dipartimento
0704.0206	Stefano Lepri, Giovanni Giacomelli	Resonant activation in bistable semiconductor lasers	We theoretically investigate the possibility of observing resonant activation in the hopping dynamics of two-mode semiconductor lasers. We present a series of simulations of a rate-equations model under random and periodic modulation of the bias current. In both cases, for an optimal choice of the modulation time-scale, the hopping times between the stable lasing modes attain a minimum. The simulation data are understood by means of an effective one-dimensional Langevin equation with multiplicative fluctuations. Our conclusions apply to both Edge Emitting and Vertical Cavity Lasers, thus opening the way to several experimental tests in such optical systems.	What is the title of this paper? arXiv:0704.0206v1 [physics.optics] 2 Apr 2007Resonant activation in bistable semiconductor lasers Stefano Lepri1,∗and Giovanni Giacomelli1 1Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy (Dated: November 4, 2018) We the
0704.0207	M Prakash	Quark matter and the astrophysics of neutron stars	Some of the means through which the possible presence of nearly deconfined quarks in neutron stars can be detected by astrophysical observations of neutron stars from their birth to old age are highlighted.	What is the title of this paper? arXiv:0704.0207v1 [astro-ph] 2 Apr 2007Quark matter and the astrophysics of neutron stars M Prakash Department of Physics & Astronomy, Ohio University, Athens, OH 4 5701, USA E-mail:prakash@harsha.phy.ohiou.edu Abstract. Some of the means through which the possible presence of nearly deconﬁned qua
0704.0208	Tobias J. Hagge and Seung-Moon Hong	Some non-braided fusion categories of rank 3	We classify all fusion categories for a given set of fusion rules with three simple object types. If a conjecture of Ostrik is true, our classification completes the classification of fusion categories with three simple object types. To facilitate the discussion we describe a convenient, concrete and useful variation of graphical calculus for fusion categories, discuss pivotality and sphericity in this framework, and give a short and elementary re-proof of the fact that the quadruple dual functor is naturally isomorphic to the identity.	What is the title of this paper? arXiv:0704.0208v2 [math.GT] 24 Sep 2007SOME NON-BRAIDED FUSION CATEGORIES OF RANK 3 TOBIAS J. HAGGE AND SEUNG-MOON HONG Abstract. We classify all fusion categories for a given set of fusion ru les with three simple object types. If a conjecture of Ostrik is true, our classiﬁcation completes the cl
0704.0209	Sangwook Park, David N. Burrows, Gordon P. Garmire (Penn State), Richard McCray (Colorado), Judith L. Racusin (Penn State), Svetozar A. Zhekov (Space Res Inst)	Chandra Observations of Supernova 1987A	We have been monitoring Supernova (SN) 1987A with {\it Chandra X-Ray Observatory} since 1999. We present a review of previous results from our {\it Chandra} observations, and some preliminary results from new {\it Chandra} data obtained in 2006 and 2007. High resolution imaging and spectroscopic studies of SN 1987A with {\it Chandra} reveal that X-ray emission of SN 1987A originates from the hot gas heated by interaction of the blast wave with the ring-like dense circumstellar medium (CSM) that was produced by the massive progenitor's equatorial stellar winds before the SN explosion. The blast wave is now sweeping through dense CSM all around the inner ring, and thus SN 1987A is rapidly brightening in soft X-rays. At the age of 20 yr (as of 2007 January), X-ray luminosity of SN 1987A is $L_{\rm X}$ $\sim$ 2.4 $\times$ 10$^{36}$ ergs s$^{-1}$ in the 0.5$-$10 keV band. X-ray emission is described by two-component plane shock model with electron temperatures of $kT$ $\sim$ 0.3 and 2 keV. As the shock front interacts with dense CSM all around the inner ring, the X-ray remnant is now expanding at a much slower rate of $v$ $\sim$ 1400 km s$^{-1}$ than it was until 2004 ($v$ $\sim$ 6000 km s$^{-1}$).	What is the title of this paper? arXiv:0704.0209v1 [astro-ph] 2 Apr 2007Chandra Observations of Supernova 1987A SangwookPark∗,DavidN.Burrows∗,GordonP.Garmire∗,Richard McCray†, Judith L.Racusin∗andSvetozarA.Zhekov∗∗ ∗DepartmentofAstronomyandAstrophysics,525DaveyLab.,P ennsylvaniaStateUniversity, University Park,PA16802,USA †JILA,U
0704.0210	Andrew Dancer, Mckenzie Wang	Classification of superpotentials	We extend our previous classification of superpotentials of ``scalar curvature type" for the cohomogeneity one Ricci-flat equations. We now consider the case not covered in our previous paper, i.e., when some weight vector of the superpotential lies outside (a scaled translate of) the convex hull of the weight vectors associated with the scalar curvature function of the principal orbit. In this situation we show that either the isotropy representation has at most 3 irreducible summands or the first order subsystem associated to the superpotential is of the same form as the Calabi-Yau condition for submersion type metrics on complex line bundles over a Fano K\"ahler-Einstein product.	What is the title of this paper? arXiv:0704.0210v1 [math.DG] 2 Apr 2007CLASSIFICATION OF SUPERPOTENTIALS A. DANCER AND M. WANG Abstract. We extend our previous classiﬁcation [DW4] of superpotenti als of “scalar curvature type” for the cohomogeneity one Ricci-ﬂat equations. We now consider the case not covered in [DW4], i.e., when
0704.0211	Daniela K\"uhn and Deryk Osthus	Linkedness and ordered cycles in digraphs	The minimum semi-degree of a digraph D is the minimum of its minimum outdegree and its minimum indegree. We show that every sufficiently large digraph D with minimum semi-degree at least n/2 +k-1 is k-linked. The bound on the minimum semi-degree is best possible and confirms a conjecture of Manoussakis from 1990. We also determine the smallest minimum semi-degree which ensures that a sufficiently large digraph D is k-ordered, i.e. that for every ordered sequence of k distinct vertices of D there is a directed cycle which encounters these vertices in this order.	What is the title of this paper? arXiv:0704.0211v1 [math.CO] 2 Apr 2007LINKEDNESS AND ORDERED CYCLES IN DIGRAPHS DANIELA K ¨UHN AND DERYK OSTHUS Abstract. Given a digraph D, letδ(D) := min {δ+(D),δ−(D)}be the min- imum degree of D. We show that every suﬃciently large digraph Dwith δ(D)≥n/2 +ℓ−1 isℓ-linked. The bound on the minimu
0704.0212	Z. Lalak, D. Langlois, S. Pokorski, K. Turzynski	Curvature and isocurvature perturbations in two-field inflation	We study cosmological perturbations in two-field inflation, allowing for non-standard kinetic terms. We calculate analytically the spectra of curvature and isocurvature modes at Hubble crossing, up to first order in the slow-roll parameters. We also compute numerically the evolution of the curvature and isocurvature modes from well within the Hubble radius until the end of inflation. We show explicitly for a few examples, including the recently proposed model of `roulette' inflation, how isocurvature perturbations affect significantly the curvature perturbation between Hubble crossing and the end of inflation.	What is the title of this paper? arXiv:0704.0212v2 [hep-th] 13 Jul 2007 /BV/D9/D6/DA /CP/D8/D9/D6/CT /CP/D2/CS /CX/D7/D3 /D9/D6/DA /CP/D8/D9/D6/CT /D4 /CT/D6/D8/D9/D6/CQ/CP/D8/CX/D3/D2/D7/CX/D2 /D8 /DB /D3/B9/AS/CT/D0/CS /CX/D2/AT/CP/D8/CX/D3/D2/CI/BA /C4/CP/D0/CP/CZ1/B8 /BW/BA /C4/CP/D2/CV/D0/D3/CX/D72,3/B8 /CB/BA /C8 /D3/CZ /D
0704.0214	Miloslav Znojil	A schematic model of scattering in PT-symmetric Quantum Mechanics	One-dimensional scattering problem admitting a complex, PT-symmetric short-range potential V(x) is considered. Using a Runge-Kutta-discretized version of Schroedinger equation we derive the formulae for the reflection and transmission coefficients and emphasize that the only innovation emerges in fact via a complexification of one of the potential-characterizing parameters.	What is the title of this paper? arXiv:0704.0214v1 [quant-ph] 2 Apr 2007A schematic model of scattering inPT −symmetric Quantum Mechanics Miloslav Znojil ´Ustav jadern´ e fyziky AV ˇCR, 250 68 ˇReˇ z, Czech Republic e-mail: znojil@ujf.cas.cz Abstract One-dimensional scattering problem admitting a complex, PT −symmetric short- ran
0704.0215	Zbigniew Pucha{\l}a and Tomasz Rolski	The exact asymptotic of the collision time tail distribution for independent Brownian particles with different drifts	In this note we consider the time of the collision $\tau$ for $n$ independent Brownian motions $X^1_t,...,X_t^n$ with drifts $a_1,...,a_n$, each starting from $x=(x_1,...,x_n)$, where $x_1<...<x_n$. We show the exact asymptotics of $P_x(\tau>t) = C h(x)t^{-\alpha}e^{-\gamma t}(1 + o(1))$ as $t\to\infty$ and identify $C,h(x),\alpha,\gamma$ in terms of the drifts.	What is the title of this paper? arXiv:0704.0215v1 [math.PR] 2 Apr 2007The exact asymptotic of the collision time tail distributio n for independent Brownian particles with diﬀerent drifts. Zbigniew Pucha/suppress la1,2,3and Tomasz Rolski1,2 November 4, 2018 Abstract In this note we consider the time of the collision τfornindepen
0704.0216	Alexander Mattausch and Oleg Pankratov	Ab initio Study of Graphene on SiC	Employing density-functional calculations we study single and double graphene layers on Si- and C-terminated 1x1-6H-SiC surfaces. We show that, in contrast to earlier assumptions, the first carbon layer is covalently bonded to the substrate, and cannot be responsible for the graphene-type electronic spectrum observed experimentally. The characteristic spectrum of free-standing graphene appears with the second carbon layer, which exhibits a weak van der Waals bonding to the underlying structure. For Si-terminated substrate, the interface is metallic, whereas on C-face it is semiconducting or semimetallic for single or double graphene coverage, respectively.	What is the title of this paper? arXiv:0704.0216v2 [cond-mat.mtrl-sci] 16 Apr 2007Ab initio Study of Graphene on SiC Alexander Mattausch∗and Oleg Pankratov Theoretische Festk¨ orperphysik, Universit¨ at Erlangen- N¨ urnberg, Staudtstr. 7, 91058 Erlangen, Germany (Dated: October 30, 2018) Employing density-functional calculations
0704.0217	Wiroonsak Santipach and Michael L. Honig	Capacity of a Multiple-Antenna Fading Channel with a Quantized Precoding Matrix	Given a multiple-input multiple-output (MIMO) channel, feedback from the receiver can be used to specify a transmit precoding matrix, which selectively activates the strongest channel modes. Here we analyze the performance of Random Vector Quantization (RVQ), in which the precoding matrix is selected from a random codebook containing independent, isotropically distributed entries. We assume that channel elements are i.i.d. and known to the receiver, which relays the optimal (rate-maximizing) precoder codebook index to the transmitter using B bits. We first derive the large system capacity of beamforming (rank-one precoding matrix) as a function of B, where large system refers to the limit as B and the number of transmit and receive antennas all go to infinity with fixed ratios. With beamforming RVQ is asymptotically optimal, i.e., no other quantization scheme can achieve a larger asymptotic rate. The performance of RVQ is also compared with that of a simpler reduced-rank scalar quantization scheme in which the beamformer is constrained to lie in a random subspace. We subsequently consider a precoding matrix with arbitrary rank, and approximate the asymptotic RVQ performance with optimal and linear receivers (matched filter and Minimum Mean Squared Error (MMSE)). Numerical examples show that these approximations accurately predict the performance of finite-size systems of interest. Given a target spectral efficiency, numerical examples show that the amount of feedback required by the linear MMSE receiver is only slightly more than that required by the optimal receiver, whereas the matched filter can require significantly more feedback.	What is the title of this paper? arXiv:0704.0217v2 [cs.IT] 17 Feb 2009IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 55, NO. 3, MAR CH 2009 1 Capacity of a Multiple-Antenna Fading Channel With a Quantized Precoding Matrix Wiroonsak Santipach, Member, IEEE, and Michael L. Honig, Fellow, IEEE Abstract—Given a multiple-input multiple
0704.0218	Yuri Pritykin	On Almost Periodicity Criteria for Morphic Sequences in Some Particular Cases	In some particular cases we give criteria for morphic sequences to be almost periodic (=uniformly recurrent). Namely, we deal with fixed points of non-erasing morphisms and with automatic sequences. In both cases a polynomial-time algorithm solving the problem is found. A result more or less supporting the conjecture of decidability of the general problem is given.	What is the title of this paper? arXiv:0704.0218v1 [cs.DM] 2 Apr 2007On Almost Periodicity Criteria for Morphic Sequences in Some Particular Cases Yuri Pritykin∗ November 4, 2018 Abstract In some particular cases we give criteria for morphic sequences to b e almost periodic (=uni- formly recurrent). Namely, we deal with ﬁxed poin
0704.0219	Joseph D. Gelfand, B. M. Gaensler, Patrick O. Slane, Daniel J. Patnaude, John P. Hughes, Fernando Camilo	The Radio Emission, X-ray Emission, and Hydrodynamics of G328.4+0.2: A Comprehensive Analysis of a Luminous Pulsar Wind Nebula, its Neutron Star, and the Progenitor Supernova Explosion	We present new observational results obtained for the Galactic non-thermal radio source G328.4+0.2 to determine both if this source is a pulsar wind nebula or supernova remnant, and in either case, the physical properties of this source. Using X-ray data obtained by XMM, we confirm that the X-ray emission from this source is heavily absorbed and has a spectrum best fit by a power law model of photon index=2 with no evidence for a thermal component, the X-ray emission from G328.4+0.2 comes from a region significantly smaller than the radio emission, and that the X-ray and radio emission are significantly offset from each other. We also present the results of a new high resolution (7 arcseconds) 1.4 GHz image of G328.4+0.2 obtained using the Australia Telescope Compact Array, and a deep search for radio pulsations using the Parkes Radio Telescope. We find that the radio emission has a flat spectrum, though some areas along the eastern edge of G328.4+0.2 have a steeper radio spectral index of ~-0.3. Additionally, we obtain a luminosity limit of the central pulsar of L_{1400} < 30 mJy kpc^2, assuming a distance of 17 kpc. In light of these observational results, we test if G328.4+0.2 is a pulsar wind nebula (PWN) or a large PWN inside a supernova remnant (SNR) using a simple hydrodynamic model for the evolution of a PWN inside a SNR. As a result of this analysis, we conclude that G328.4+0.2 is a young (< 10000 years old) pulsar wind nebula formed by a low magnetic field (<10^12 G) neutron star born spinning rapidly (<10 ms) expanding into an undetected SNR formed by an energetic (>10^51 ergs), low ejecta mass (M < 5 Solar Masses) supernova explosion which occurred in a low density (n~0.03 cm^{-3}) environment.	What is the title of this paper? arXiv:0704.0219v1 [astro-ph] 2 Apr 2007Draft version November 4, 2018 Preprint typeset using L ATEX style emulateapj v. 3/25/03 THE RADIO EMISSION, X-RAY EMISSION, AND HYDRODYNAMICS OF G3 28.4+0.2: A COMPREHENSIVE ANALYSIS OF A LUMINOUS PULSAR WIND NEBULA, ITS NEUTRON STAR, AND THE PROGENITOR SUPE
0704.0220	Jason Glyndwr Ulery (for the STAR Collaboration)	Three Particle Correlations from STAR	Two-particle correlations have shown modification to the away-side shape in central Au+Au collisions relative to $pp$, d+Au and peripheral Au+Au collisions. Different scenarios can explain this modification including: large angle gluon radiation, jets deflected by transverse flow, path length dependent energy loss, Cerenkov gluon radiation of fast moving particles, and conical flow generated by hydrodynamic Mach-cone shock-waves. Three-particle correlations have the power to distinguish the scenarios with conical emission, conical flow and Cerenkov radiation, from other scenarios. In addition, the dependence of the observed shapes on the $p_T$ of the associated particles can be used to distinguish conical emission from a sonic boom (Mach-cone) and from QCD-Cerenkov radiation. We present results from STAR on 3-particle azimuthal correlations for a high $p_T$ trigger particle with two softer particles. Results are shown for $pp$, d+Au and high statistics Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV. An important aspect of the analysis is the subtraction of combinatorial backgrounds. Systematic uncertainties due to this subtraction and the flow harmonics v2 and v4 are investigated in detail. The implications of the results for the presence or absence of conical flow from Mach-cones are discussed.	What is the title of this paper? arXiv:0704.0220v1 [nucl-ex] 2 Apr 2007November 4, 2018 14:16 WSPC/INSTRUCTION FILE IWCF˙v3 International Journal of Modern Physics E c/circleco√yrtWorld Scientiﬁc Publishing Company THREE PARTICLE CORRELATIONS FROM STAR Jason Glyndwr Ulery Department of Physics, Purdue University, 525 Northwester
0704.0221	Lawrence M. Krauss (1,2) and Robert J. Scherrer (2) ((1) Case Western Reserve University, (2) Vanderbilt University)	The Return of a Static Universe and the End of Cosmology	We demonstrate that as we extrapolate the current $\Lambda$CDM universe forward in time, all evidence of the Hubble expansion will disappear, so that observers in our "island universe" will be fundamentally incapable of determining the true nature of the universe, including the existence of the highly dominant vacuum energy, the existence of the CMB, and the primordial origin of light elements. With these pillars of the modern Big Bang gone, this epoch will mark the end of cosmology and the return of a static universe. In this sense, the coordinate system appropriate for future observers will perhaps fittingly resemble the static coordinate system in which the de Sitter universe was first presented.	What is the title of this paper? arXiv:0704.0221v3 [astro-ph] 27 Jun 2007The Return of a Static Universe and the End of Cosmology Lawrence M. Krauss1,2and Robert J. Scherrer2 1Department of Physics, Case Western Reserve University, Cleveland, OH 44106; email: krauss@cwru.edu and 2Department of Physics & Astronomy, Vanderbilt Univ
0704.0222	Miguel A. Sanchez-Conde	Dark Matter annihilation in Draco: new considerations on the expected gamma flux	A new estimation of the gamma-ray flux that we expect to detect from SUSY dark matter annihilation from the Draco dSph is presented using the DM density profiles compatible with the latest observations. This calculation takes also into account the important effect of the Point Spread Function (PSF) of the telescope. We show that this effect is crucial in the way we will observe and interpret a possible signal detection. Finally, we discuss the prospects to detect a possible gamma signal from Draco for MAGIC and GLAST.	What is the title of this paper? arXiv:0704.0222v1 [astro-ph] 2 Apr 2007DarkMatter annihilationinDraco:new considerationsof theexpected gammaﬂux1 Miguel A.Sánchez-Conde InstitutodeAstroﬁsicadeAndalucia(CSIC),E-18008,Gran ada,Spain Abstract. A new estimation of the γ-ray ﬂux that we expect to detect from SUSY dark matter annihi la
0704.0223	Yu-Qing Lou (1,2,3) and Wei-Gang Wang (1), ((1) Tsinghua Center For astrophysics, Tsinghua University, (2)The University of Chicago, (3) National Astronomical Observatories, Chinese Academy of Science.)	Magnetohydrodynamic Rebound Shocks of Supernovae	We construct magnetohydrodynamic (MHD) similarity rebound shocks joining `quasi-static' asymptotic solutions around the central degenerate core to explore an MHD model for the evolution of random magnetic field in supernova explosions. This provides a theoretical basis for further studying synchrotron diagnostics, MHD shock acceleration of cosmic rays, and the nature of intense magnetic field in compact objects. The magnetic field strength in space approaches a limiting ratio, that is comparable to the ratio of the ejecta mass driven out versus the progenitor mass, during this self-similar rebound MHD shock evolution. The intense magnetic field of the remnant compact star as compared to that of the progenitor star is mainly attributed to both the gravitational core collapse and the radial distribution of magnetic field.	What is the title of this paper? arXiv:0704.0223v1 [astro-ph] 2 Apr 2007Mon. Not. R. Astron. Soc. 000, 000–000 (0000) Printed 4 November 2018 (MN L ATEX style ﬁle v2.2) Magnetohydrodynamic Rebound Shocks of Supernovae Yu-Qing Lou1,2,3⋆and Wei-Gang Wang1 1Physics Department and Tsinghua Centre for Astrophysics (T HCA), Tsinghua Un
0704.0224	Jason Glyndwr Ulery (for the STAR Collaboration)	Are There Mach Cones in Heavy Ion Collisions? Three-Particle Correlations from STAR	We present results from STAR on 3-particle azimuthal correlations for a $3<p_T<4$ GeV/c trigger particle with two softer $1<p_T<2$ GeV/c particles. Results are shown for pp, d+Au and high statistics Au+Au collisions at $\sqrt{s_{NN}}=200 GeV$. We observe a 3-particle correlation in central Au+Au collisions which may indicate the presence of conical emission. In addition, the dependence of the observed signal angular position on the $p_T$ of the associated particles can be used to distinguish conical flow from simple QCD-\v{C}erenkov radiation. An important aspect of the analysis is the subtraction of combinatorial backgrounds. Systematic uncertainties due to this subtraction and the flow harmonics $v_2$ and $v_4$ are investigated in detail.	What is the title of this paper? arXiv:0704.0224v1 [nucl-ex] 2 Apr 2007November 4, 2018 14:16 WSPC/INSTRUCTION FILE QM2006PosterProceedings˙V4 International Journal of Modern Physics E c/circleco√yrtWorld Scientiﬁc Publishing Company ARE THERE MACH CONES IN HEAVY ION COLLISIONS? THREE-PARTICLE CORRELATIONS FROM STAR JASON GLYNDWR
0704.0225	A. Kashlinsky and D. Band	Exploring First Stars Era with GLAST	Cosmic infrared background (CIB) includes emissions from objects inaccessible to current telescopic studies, such as the putative Population III, the first stars. Recently, strong direct evidence for significant CIB levels produced by the first stars came from CIB fluctuations discovered in deep Spitzer images. Such CIB levels should have left a unique absorption feature in the spectra of high-z GRBs and blazars as suggested in [4]. This is observable with GLAST sources at z>2 and measuring this absorption will give important information on energetics and constituents of the first stars era.	What is the title of this paper? Exploring First Stars Era with GLAST A. Kashlinsky1,2 and D. Band1,3,4 1 Observational Cosmology Lab, Goddard Space Flight Center, Greenbelt MD 20771, 2SSAI, 3UMBC, 4CRESST Abstract. Cosmic infrared background (CIB) includes emissions from objects inaccessible to current telescopic studies, such
0704.0226	F. Tombesi (1,2), B. De Marco (3), K. Iwasawa (4), M. Cappi (1), M. Dadina (1), G. Ponti (1,2), G. Miniutti (5) and G.G.C. Palumbo (2) ((1) INAF-IASF Bologna, (2) UNIBO, (3) SISSA, (4) MPE, (5) Institute of Astronomy, Cambridge)	Correlated modulation between the redshifted Fe K alpha line and the continuum emission in NGC 3783	It has been suggested that X-ray observations of rapidly variable Seyfert galaxies may hold the key to probe the gas orbital motions in the innermost regions of accretion discs around black holes and, thus, trace flow patterns under the effect of the hole strong gravitational field. We explore this possibility analizing XMM-Newton observations of the seyfert 1 galaxy NGC 3783. A detiled time-resolved spectral analysis is performed down to the shortest possible time-scales (few ks) using "excess maps" and cross-correlating light curves in different energy bands. In addition to a constant core of the Fe K alpha line, we detected a variable and redshifted Fe K alpha emission feature between 5.3-6.1 keV. The line exhibits a modulation on a time-scale of 27 ks that is similar to and in phase with a modulation of the 0.3-10 keV source continuum. The time-scale of the correlated variability of the redshifted Fe line and continuum agrees with the local dynamical time-scale of the accretion disc at 10 r_g around a black hole of 10^7 M_sun. Given the shape of the redshfted line emission and the overall X-ray variability pattern, the line is likely to arise from the relativistic region near the black hole.	What is the title of this paper? arXiv:0704.0226v1 [astro-ph] 2 Apr 2007Astronomy& Astrophysics manuscriptno.6713 c/circlecopyrtESO 2018 October31,2018 Correlatedmodulation betweenthe redshifted Fe K αline and the continuum emissioninNGC3783 F.Tombesi1,2,B.DeMarco3,K.Iwasawa4,M.Cappi1,M. Dadina1, G.Ponti1,2, G.Miniutti5, and G.G.
0704.0227	C.Sfienti, M. De Napoli, S. Bianchin, A.S. Botvina, J. Brzychczyk, A. Le Fevre, J. Lukasik, P. Pawlowski, W. Trautmann and the ALADiN2000 Collaboration	Isotopic Effects in Nuclear Reactions at Relativistic Energies	A systematic study of isotopic effects in the break-up of projectile spectators at relativistic energies has been performed at the GSI laboratory with the ALADiN spectrometer coupled to the LAND neutron detector. Besides a primary beam of 124Sn, also secondary beams of 124La and 107Sn produced at the FRS fragment separator have been used in order to extend the range of isotopic compositions. The gross properties of projectile fragmentation are very similar for all the studied systems but specific isotopic effects have been observed in both neutron and charged particle production. The breakup temperatures obtained from the double ratios of isotopic yields have been extracted and compared with the limiting-temperature expectation.	What is the title of this paper? ISOTOPIC EFFECTS IN NUCLEAR REACTIONS AT RELATIVISTIC ENERGIES C.Sfienti(1), M. De Napoli(2), S. Bianchin(1), A.S. Botvina(1)(6), J. Brzychczyk(4), A. Le Fèvre(1), J. Lukasik(1)(9), P. Pawlowski(4), W. Trautmann(1), P. Adrich(1), T. Aumann(1), C.O. Bacri(3), T. Barczyk(4), R. Bassini(5), C.
0704.0228	Theo M. Nieuwenhuizen	Einstein vs Maxwell: Is gravitation a curvature of space, a field in flat space, or both?	Starting with a field theoretic approach in Minkowski space, the gravitational energy momentum tensor is derived from the Einstein equations in a straightforward manner. This allows to present them as {\it acceleration tensor} = const. $\times$ {\it total energy momentum tensor}. For flat space cosmology the gravitational energy is negative and cancels the material energy. In the relativistic theory of gravitation a bimetric coupling between the Riemann and Minkowski metrics breaks general coordinate invariance. The case of a positive cosmological constant is considered. A singularity free version of the Schwarzschild black hole is solved analytically. In the interior the components of the metric tensor quickly die out, but do not change sign, leaving the role of time as usual. For cosmology the $\Lambda$CDM model is covered, while there appears a form of inflation at early times. Here both the total energy and the zero point energy vanish.	What is the title of this paper? arXiv:0704.0228v1 [gr-qc] 2 Apr 2007epl draft Einstein vs Maxwell: Is gravitation a curvature of space, a ﬁeld in ﬂat space, or both? Theo M. Nieuwenhuizen Institutefor Theoretical Physics, University of Amsterda m, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands PACS04.20.Cv – Fundamental
0704.0229	Ketan D. Mulmuley	Geometric Complexity Theory VI: the flip via saturated and positive integer programming in representation theory and algebraic geometry	This article belongs to a series on geometric complexity theory (GCT), an approach to the P vs. NP and related problems through algebraic geometry and representation theory. The basic principle behind this approach is called the flip. In essence, it reduces the negative hypothesis in complexity theory (the lower bound problems), such as the P vs. NP problem in characteristic zero, to the positive hypothesis in complexity theory (the upper bound problems): specifically, to showing that the problems of deciding nonvanishing of the fundamental structural constants in representation theory and algebraic geometry, such as the well known plethysm constants--or rather certain relaxed forms of these decision probelms--belong to the complexity class P. In this article, we suggest a plan for implementing the flip, i.e., for showing that these relaxed decision problems belong to P. This is based on the reduction of the preceding complexity-theoretic positive hypotheses to mathematical positivity hypotheses: specifically, to showing that there exist positive formulae--i.e. formulae with nonnegative coefficients--for the structural constants under consideration and certain functions associated with them. These turn out be intimately related to the similar positivity properties of the Kazhdan-Lusztig polynomials and the multiplicative structural constants of the canonical (global crystal) bases in the theory of Drinfeld-Jimbo quantum groups. The known proofs of these positivity properties depend on the Riemann hypothesis over finite fields and the related results. Thus the reduction here, in conjunction with the flip, in essence, says that the validity of the P vs. NP conjecture in characteristic zero is intimately linked to the Riemann hypothesis over finite fields and related problems.	What is the title of this paper? arXiv:0704.0229v4 [cs.CC] 22 Jan 2009Geometric Complexity Theory VI: the ﬂip via saturated and positive integer programming in representation theory and algebraic geometry Dedicated to Sri Ramakrishna Ketan D. Mulmuley The University of Chicago http://ramakrishnadas.cs.uchicago.edu (Technical repo
0704.0230	R. Duffard and F. Roig	Two new basaltic asteroids in the Outer Main Belt?	The identification of basaltic asteroids in the asteroid Main Belt and the description of their surface mineralogy is necessary to understand the diversity in the collection of basaltic meteorites. Basaltic asteroids can be identified from their visible reflectance spectra and are classified as V-type in the usual taxonomies. In this work, we report visible spectroscopic observations of two candidate V-type asteroids, (7472) Kumakiri and (10537) 1991 RY16, located in the outer Main Belt (a > 2.85 UA). These candidate have been previously identified by Roig and Gil-Hutton (2006, Icarus 183, 411) using the Sloan Digital Sky Survey colors. The spectroscopic observations have been obtained at the Calar Alto Observatory, Spain, during observational runs in November and December 2006. The spectra of these two asteroids show the steep slope shortwards of 0.70 microns and the deep absorption feature longwards of 0.75 microns that are characteristic of V-type asteroids. However, the presence of a shallow but conspicuous absorption band around 0.65 microns opens some questions about the actual mineralogy of these two asteroids. Such band has never been observed before in basaltic asteroids with the intensity we detected it. We discuss the possibility for this shallow absorption feature to be caused by the presence of chromium on the asteroid surface. Our results indicate that, together with (1459) Magnya, asteroids (7472) Kumakiri and (10537) 1991 RY16 may be the only traces of basaltic material found up to now in the outer Main Belt.	What is the title of this paper? T w o new V-t yp e asteroids in the outer Main Belt?1 R. Duard2 Instituto de Astr ofísic a de A ndalucía, C/ Bajo de Huetor, 50. 18008. Gr anada, Sp ain, and Max Planck Institute for Solar System R ese ar ch, Max Planck Str. 2, Katlenbur g-Lindau, Germany duffard@iaa.es and F. Roig Observatório Na
0704.0231	Joaquim Ortega-Cerda	Interpolating and sampling sequences in finite Riemann surfaces	We provide a description of the interpolating and sampling sequences on a space of holomorphic functions with a uniform growth restriction defined on finite Riemann surfaces.	What is the title of this paper? arXiv:0704.0231v1 [math.CV] 2 Apr 2007INTERPOLATING AND SAMPLING SEQUENCES IN FINITE RIEMANN SURFACES JOAQUIM ORTEGA-CERD `A Abstract. We provide a description of the interpolating and sampling sequences on a spaceofholomorphicfunctionswithauniformgrowthrestrictionde ﬁnedonﬁniteRiemann surfaces. 1
0704.0232	Christoph Bergbauer, Dirk Kreimer	New algebraic aspects of perturbative and non-perturbative Quantum Field Theory	In this expository article we review recent advances in our understanding of the combinatorial and algebraic structure of perturbation theory in terms of Feynman graphs, and Dyson-Schwinger equations. Starting from Lie and Hopf algebras of Feynman graphs, perturbative renormalization is rephrased algebraically. The Hochschild cohomology of these Hopf algebras leads the way to Slavnov-Taylor identities and Dyson-Schwinger equations. We discuss recent progress in solving simple Dyson-Schwinger equations in the high energy sector using the algebraic machinery. Finally there is a short account on a relation to algebraic geometry and number theory: understanding Feynman integrals as periods of mixed (Tate) motives.	What is the title of this paper? arXiv:0704.0232v2 [hep-th] 4 Nov 2009New algebraic aspects of perturbative and non-perturbative Quantum Field Theory Christoph Bergbauer1,4and Dirk Kreimer2,3 1Freie Universit¨ at Berlin, Institut f¨ ur Mathematik II Arnimallee 3, 14195 Berlin, Germany 2CNRS at Institut des Hautes Etudes Scientiﬁq
0704.0233	Andrea Tomadin, Riccardo Mannella, and Sandro Wimberger	Many-body interband tunneling as a witness for complex dynamics in the Bose-Hubbard model	A perturbative model is studied for the tunneling of many-particle states from the ground band to the first excited energy band, mimicking Landau-Zener decay for ultracold, spinless atoms in quasi-one dimensional optical lattices subjected to a tunable tilting force. The distributions of the computed tunneling rates provide an independent and experimentally accessible signature of the regular-chaotic transition in the strongly correlated many-body dynamics of the ground band.	What is the title of this paper? arXiv:0704.0233v1 [cond-mat.other] 2 Apr 2007Many-body interband tunneling as a witness for complex dyna mics in the Bose-Hubbard model Andrea Tomadin,1Riccardo Mannella,1and Sandro Wimberger1,2 1Dipartimento di Fisica, Unversit` a degli Studi di Pisa, Lar go Pontecorvo 3, 56127 Pisa, Italy 2CNISM
0704.0234	G. Ghirlanda (1), L. Nava (1,2), G. Ghisellini (1), C. Firmani (1,3) ((1) Osserv. Astr. di Brera, (2) Univ. degli Studi dell'Insubria, (3) U.N.A.M.)	Comments on ``Are Swift Gamma-Ray Bursts consistent with the Ghirlanda relation?", by Campana et al.(astro--ph/0703676)	In their recent paper, Campana et al. (2007) found that 5 bursts, among those detected by Swift, are outliers with respect to the E_peak-E_gamma ("Ghirlanda") correlation. We instead argue that they are not.	What is the title of this paper? arXiv:0704.0234v1 [astro-ph] 2 Apr 2007Comments on “Are Swift Gamma-Ray Bursts consistent with the Ghirlanda relation?”, by Campana et al.(astro–ph/0703 676) G. Ghirlandaa, L. Navaa b, G. Ghisellinia, C. Firmania c aOsservatorio Astronomico di Brera, via Bianchi 46, I–20387, Mer ate, Italy bUniv.
0704.0235	Thomas G. Rizzo	The Determination of the Helicity of $W'$ Boson Couplings at the LHC	Apart from its mass and width, the most important property of a new charged gauge boson, $W'$, is the helicity of its couplings to the SM fermions. Such particles are expected to exist in many extensions of the Standard Model. In this paper we explore the capability of the LHC to determine the $W'$ coupling helicity at low integrated luminosities in the $\ell +E_T^{miss}$ discovery channel. We find that measurements of the transverse mass distribution, reconstructed from this final state in the $W-W'$ interference region, provides the best determination of this quantity. To make such measurements requires integrated luminosities of $\sim 10(60) fb^{-1}$ assuming $M_{W'}=1.5(2.5)$ TeV and provided that the $W'$ couplings have Standard Model magnitude. This helicity determination can be further strengthened by the use of various discovery channel leptonic asymmetries, also measured in the same interference regime, but with higher integrated luminosities.	What is the title of this paper? arXiv:0704.0235v4 [hep-ph] 7 May 2007SLAC-PUB-12392 The Determination of the Helicity of W′Boson Couplings at the LHC∗ † Thomas G. Rizzoa Stanford Linear Accelerator Center, 2575 Sand Hill Rd., Menlo Park, CA, 94025 Abstract Apart from its mass and width, the most important property of a ne w char
0704.0236	Claus Gerhardt	Curvature flows in semi-Riemannian manifolds	We prove that the limit hypersurfaces of converging curvature flows are stable, if the initial velocity has a weak sign, and give a survey of the existence and regularity results.	What is the title of this paper? arXiv:0704.0236v4 [math.DG] 6 Apr 2008CURVATURE FLOWS IN SEMI-RIEMANNIAN MANIFOLDS CLAUS GERHARDT Abstract. We prove that the limit hypersurfaces of converging curva- ture ﬂows are stable, if the initial velocity has a weak sign, and give a survey of the existence and regularity results. Contents
0704.0237	Christopher W. Mauche, Duane A. Liedahl, Shizuka Akiyama (Lawrence Livermore Nat'l Lab.), Tomasz Plewa (University of Chicago)	Hydrodynamic and Spectral Simulations of HMXB Winds	We describe preliminary results of a global model of the radiatively-driven photoionized wind and accretion flow of the high-mass X-ray binary Vela X-1. The full model combines FLASH hydrodynamic calculations, XSTAR photoionization calculations, HULLAC atomic data, and Monte Carlo radiation transport. We present maps of the density, temperature, velocity, and ionization parameter from a FLASH two-dimensional time-dependent simulation of Vela X-1, as well as maps of the emissivity distributions of the X-ray emission lines.	What is the title of this paper? arXiv:0704.0237v1 [astro-ph] 2 Apr 20071 Hydrodynamic and Spectral Simulations of HMXB Winds Christopher W. Mauche1,∗), Duane A. Liedahl1,∗∗), Shizuka Akiyama1,∗∗∗), and TomekPlewa2,†) 1Lawrence Livermore National Laboratory, Livermore, CA 94550, USA 2University of Chicago, 5640 South Ellis Avenue
0704.0238	Geoffrey C. Bower (Berkeley), Alberto Bolatto (Berkeley), Eric Ford (CfA, Florida), Paul Kalas (Berkeley), Jim Ulvestad (NRAO)	Radio Astrometric Detection and Characterization of Extra-Solar Planets: A White Paper Submitted to the NSF ExoPlanet Task Force	The extraordinary astrometric accuracy of radio interferometry creates an important and unique opportunity for the discovery and characterization of exo-planets. Currently, the Very Long Baseline Array can routinely achieve better than 100 microarcsecond accuracy, and can approach 10 microarcsecond with careful calibration. We describe here RIPL, the Radio Interferometric PLanet search, a new program with the VLBA and the Green Bank 100 m telescope that will survey 29 low-mass, active stars over 3 years with sub-Jovian planet mass sensitivity at 1 AU. An upgrade of the VLBA bandwidth will increase astrometric accuracy by an order of magnitude. Ultimately, the colossal collecting area of the Square Kilometer Array could push astrometric accuracy to 1 microarcsecond, making detection and characterizaiton of Earth mass planets possible. RIPL and other future radio astrometric planet searches occupy a unique volume in planet discovery and characterization parameter space. The parameter space of astrometric searches gives greater sensitivity to planets at large radii than radial velocity searches. For the VLBA and the expanded VLBA, the targets of radio astrometric surveys are by necessity nearby, low-mass, active stars, which cannot be studied efficiently through the radial velocity method, coronagraphy, or optical interferometry. For the SKA, detection sensitivity will extend to solar-type stars. Planets discovered through radio astrometric methods will be suitable for characterization through extreme adaptive optics. The complementarity of radio astrometric techniques with other methods demonstrates that radio astrometry can play an important role in the roadmap for exoplanet discovery and characterization.	What is the title of this paper? arXiv:0704.0238v1 [astro-ph] 2 Apr 2007Radio Astrometric Detection and Characterization of Extra -Solar Planets: A White Paper Submitted to the NSF ExoPlanet Task Force Geoﬀrey C. Bower1, Alberto Bolatto1, Eric Ford2, Paul Kalas1, Jim Ulvestad3 ABSTRACT The extraordinary astrometric accuracy of ra
0704.0239	Joachim Dzubiella	Interface dynamics of microscopic cavities in water	An analytical description of the interface motion of a collapsing nanometer-sized spherical cavity in water is presented by a modification of the Rayleigh-Plesset equation in conjunction with explicit solvent molecular dynamics simulations. Quantitative agreement is found between the two approaches for the time-dependent cavity radius $R(t)$ at different solvent conditions while in the continuum picture the solvent viscosity has to be corrected for curvature effects. The typical magnitude of the interface or collapse velocity is found to be given by the ratio of surface tension and fluid viscosity, $v\simeq\gamma/\eta$, while the curvature correction accelerates collapse dynamics on length scales below the equilibrium crossover scales ($\sim$1nm). The study offers a starting point for an efficient implicit modeling of water dynamics in aqueous nanoassembly and protein systems in nonequilibrium.	What is the title of this paper? arXiv:0704.0239v1 [cond-mat.soft] 2 Apr 2007Interface dynamics of microscopic cavities in water Joachim Dzubiella1,∗ 1Physics Department, Technical University Munich, 85748 Ga rching, Germany (Dated: November 4, 2018) An analytical description of the interface motion of a colla psing nanometer-siz
0704.0240	D. T. Son, A. O. Starinets	Viscosity, Black Holes, and Quantum Field Theory	We review recent progress in applying the AdS/CFT correspondence to finite-temperature field theory. In particular, we show how the hydrodynamic behavior of field theory is reflected in the low-momentum limit of correlation functions computed through a real-time AdS/CFT prescription, which we formulate. We also show how the hydrodynamic modes in field theory correspond to the low-lying quasinormal modes of the AdS black p-brane metric. We provide a proof of the universality of the viscosity/entropy ratio within a class of theories with gravity duals and formulate a viscosity bound conjecture. Possible implications for real systems are mentioned.	What is the title of this paper? arXiv:0704.0240v2 [hep-th] 11 Jul 2007INT PUB 07-02 Viscosity, Black Holes, and Quantum Field Theory Dam T. Son Institute for Nuclear Theory, University of Washington, Se attle, Washington 98195-1550, USA Andrei O. Starinets Perimeter Institute for Theoretical Physics, Waterloo, On tario N2L 2Y5,
0704.0241	J.P.Hague	Superconducting states of the quasi-2D Holstein model: Effects of vertex and non-local corrections	I investigate superconducting states in a quasi-2D Holstein model using the dynamical cluster approximation (DCA). The effects of spatial fluctuations (non-local corrections) are examined and approximations neglecting and incorporating lowest-order vertex corrections are computed. The approximation is expected to be valid for electron-phonon couplings of less than the bandwidth. The phase diagram and superconducting order parameter are calculated. Effects which can only be attributed to theories beyond Migdal--Eliashberg theory are present. In particular, the order parameter shows momentum dependence on the Fermi-surface with a modulated form and s-wave order is suppressed at half-filling. The results are discussed in relation to Hohenberg's theorem and the BCS approximation.	What is the title of this paper? arXiv:0704.0241v1 [cond-mat.supr-con] 2 Apr 2007Superconducting states of the quasi-2D Holstein model: Eﬀects of vertex and non-local corrections J.P.Hague Dept. of Physics and Astronomy, University of Leicester, Le icester, LE1 7RH Abstract. I investigate superconducting states in a quasi-2D Hols
0704.0242	Vincent L. Fish (NRAO)	Masers and star formation	Recent observational and theoretical advances concerning astronomical masers in star forming regions are reviewed. Major masing species are considered individually and in combination. Key results are summarized with emphasis on present science and future prospects.	What is the title of this paper? arXiv:0704.0242v1 [astro-ph] 2 Apr 2007Astrophysical masers and their environments Proceedings IAU Symposium No. 242, 2007 J. Chapman & W. Baan, eds.c/circlecopyrt2007 International Astronomical Union DOI: 00.0000/X000000000000000X Masers and star formation Vincent L. Fish Jansky Fellow, National
0704.0243	J. Bauer and A.C. Hewson	Renormalized quasiparticles in antiferromagnetic states of the Hubbard model	We analyze the properties of the quasiparticle excitations of metallic antiferromagnetic states in a strongly correlated electron system. The study is based on dynamical mean field theory (DMFT) for the infinite dimensional Hubbard model with antiferromagnetic symmetry breaking. Self-consistent solutions of the DMFT equations are calculated using the numerical renormalization group (NRG). The low energy behavior in these results is then analyzed in terms of renormalized quasiparticles. The parameters for these quasiparticles are calculated directly from the NRG derived self-energy, and also from the low energy fixed point of the effective impurity. They are found to be in good agreement. We show that the main low energy features of the $\bf k$-resolved spectral density can be understood in terms of the quasiparticle picture. We also find that Luttinger's theorem is satisfied for the total electron number in the doped antiferromagnetic state.	What is the title of this paper? arXiv:0704.0243v2 [cond-mat.str-el] 22 Jun 2007EPJ manuscript No. (will be inserted by the editor) Renormalized quasiparticles in antiferromagnetic states of the Hubbard model J. Bauer and A.C. Hewson Department of Mathematics, Imperial College, London SW7 2A Z, United Kingdom November 4, 2018 Abs