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id stringlengths 9 9	authors stringlengths 5 763	title stringlengths 15 188	abstract stringlengths 44 1.87k	text stringlengths 243 333
0704.0002	Ileana Streinu and Louis Theran	Sparsity-certifying Graph Decompositions	We describe a new algorithm, the $(k,\ell)$-pebble game with colors, and use it obtain a characterization of the family of $(k,\ell)$-sparse graphs and algorithmic solutions to a family of problems concerning tree decompositions of graphs. Special instances of sparse graphs appear in rigidity theory and have received increased attention in recent years. In particular, our colored pebbles generalize and strengthen the previous results of Lee and Streinu and give a new proof of the Tutte-Nash-Williams characterization of arboricity. We also present a new decomposition that certifies sparsity based on the $(k,\ell)$-pebble game with colors. Our work also exposes connections between pebble game algorithms and previous sparse graph algorithms by Gabow, Gabow and Westermann and Hendrickson.	What is the title of this paper? Sparsity-certifying Graph Decompositions Ileana Streinu1, Louis Theran2 1Department of Computer Science, Smith College, Northampton, MA. e-mail: streinu@cs.smith.edu 2Department of Computer Science, University of Massachusetts Amherst. e-mail: theran@cs.umass.edu Abstract. We describe a new algorit
0704.0003	Hongjun Pan	The evolution of the Earth-Moon system based on the dark matter field fluid model	The evolution of Earth-Moon system is described by the dark matter field fluid model proposed in the Meeting of Division of Particle and Field 2004, American Physical Society. The current behavior of the Earth-Moon system agrees with this model very well and the general pattern of the evolution of the Moon-Earth system described by this model agrees with geological and fossil evidence. The closest distance of the Moon to Earth was about 259000 km at 4.5 billion years ago, which is far beyond the Roche's limit. The result suggests that the tidal friction may not be the primary cause for the evolution of the Earth-Moon system. The average dark matter field fluid constant derived from Earth-Moon system data is 4.39 x 10^(-22) s^(-1)m^(-1). This model predicts that the Mars's rotation is also slowing with the angular acceleration rate about -4.38 x 10^(-22) rad s^(-2).	What is the title of this paper? The evolution of the Ear th-Moon system based on the dark matter field fluid model Hongjun Pan Department of Chemistry University of North Texas, Denton, Texas 76203, U. S. A. Abstract The evolution of Earth-Moon system is described by the dark matter field fluid model with a non-Newto
0704.0004	David Callan	A determinant of Stirling cycle numbers counts unlabeled acyclic single-source automata	We show that a determinant of Stirling cycle numbers counts unlabeled acyclic single-source automata. The proof involves a bijection from these automata to certain marked lattice paths and a sign-reversing involution to evaluate the determinant.	What is the title of this paper? arXiv:0704.0004v1 [math.CO] 31 Mar 2007A Determinant of Stirling Cycle Numbers Counts Unlabeled Acyclic Single-Source Automata DAVID CALLAN Department of Statistics University of Wisconsin-Madison 1300 University Ave Madison, WI 53706-1532 callan@stat.wisc.edu March 30, 2007 Abstract We show that
0704.0005	Wael Abu-Shammala and Alberto Torchinsky	From dyadic $\Lambda_{\alpha}$ to $\Lambda_{\alpha}$	In this paper we show how to compute the $\Lambda_{\alpha}$ norm, $\alpha\ge 0$, using the dyadic grid. This result is a consequence of the description of the Hardy spaces $H^p(R^N)$ in terms of dyadic and special atoms.	What is the title of this paper? arXiv:0704.0005v1 [math.CA] 2 Apr 2007FROM DYADIC ΛαTOΛα WAEL ABU-SHAMMALA AND ALBERTO TORCHINSKY Abstract. In this paper we show how to compute the Λ αnorm ,α≥0, using the dyadic grid. This result is a consequence of the des cription of the Hardy spaces Hp(RN) in terms of dyadic and special atoms
0704.0006	Y. H. Pong and C. K. Law	Bosonic characters of atomic Cooper pairs across resonance	We study the two-particle wave function of paired atoms in a Fermi gas with tunable interaction strengths controlled by Feshbach resonance. The Cooper pair wave function is examined for its bosonic characters, which is quantified by the correction of Bose enhancement factor associated with the creation and annihilation composite particle operators. An example is given for a three-dimensional uniform gas. Two definitions of Cooper pair wave function are examined. One of which is chosen to reflect the off-diagonal long range order (ODLRO). Another one corresponds to a pair projection of a BCS state. On the side with negative scattering length, we found that paired atoms described by ODLRO are more bosonic than the pair projected definition. It is also found that at $(k_F a)^{-1} \ge 1$, both definitions give similar results, where more than 90% of the atoms occupy the corresponding molecular condensates.	What is the title of this paper? arXiv:0704.0006v1 [cond-mat.mes-hall] 31 Mar 2007Bosonic characters of atomic Cooper pairs across resonance Y. H. Pong and C. K. Law Department of Physics and Institute of Theoretical Physics , The Chinese university of Hong Kong, Shatin, Hong Kong SAR, C hina (Dated: November 4, 2018) We study th
0704.0007	Alejandro Corichi, Tatjana Vukasinac and Jose A. Zapata	Polymer Quantum Mechanics and its Continuum Limit	A rather non-standard quantum representation of the canonical commutation relations of quantum mechanics systems, known as the polymer representation has gained some attention in recent years, due to its possible relation with Planck scale physics. In particular, this approach has been followed in a symmetric sector of loop quantum gravity known as loop quantum cosmology. Here we explore different aspects of the relation between the ordinary Schroedinger theory and the polymer description. The paper has two parts. In the first one, we derive the polymer quantum mechanics starting from the ordinary Schroedinger theory and show that the polymer description arises as an appropriate limit. In the second part we consider the continuum limit of this theory, namely, the reverse process in which one starts from the discrete theory and tries to recover back the ordinary Schroedinger quantum mechanics. We consider several examples of interest, including the harmonic oscillator, the free particle and a simple cosmological model.	What is the title of this paper? arXiv:0704.0007v2 [gr-qc] 22 Aug 2007Polymer Quantum Mechanics and its Continuum Limit Alejandro Corichi,1,2, 3,∗Tatjana Vukaˇ sinac,4,†and Jos´ e A. Zapata1,‡ 1Instituto de Matem´ aticas, Unidad Morelia, Universidad Na cional Aut´ onoma de M´ exico, UNAM-Campus Morelia, A. Postal 61-3, Morelia, M
0704.0008	Damian C. Swift	Numerical solution of shock and ramp compression for general material properties	A general formulation was developed to represent material models for applications in dynamic loading. Numerical methods were devised to calculate response to shock and ramp compression, and ramp decompression, generalizing previous solutions for scalar equations of state. The numerical methods were found to be flexible and robust, and matched analytic results to a high accuracy. The basic ramp and shock solution methods were coupled to solve for composite deformation paths, such as shock-induced impacts, and shock interactions with a planar interface between different materials. These calculations capture much of the physics of typical material dynamics experiments, without requiring spatially-resolving simulations. Example calculations were made of loading histories in metals, illustrating the effects of plastic work on the temperatures induced in quasi-isentropic and shock-release experiments, and the effect of a phase transition.	What is the title of this paper? arXiv:0704.0008v3 [cond-mat.mtrl-sci] 1 Jul 2008Numerical solution of shock and ramp compression for general material properties Damian C. Swift∗ Materials Science and Technology Division, Lawrence Livermore National Laboratory, 7000, East Avenue, Livermore, CA 94550, U.S.A. (Dated: March 7, 2007;
0704.0009	Paul Harvey, Bruno Merin, Tracy L. Huard, Luisa M. Rebull, Nicholas Chapman, Neal J. Evans II, Philip C. Myers	The Spitzer c2d Survey of Large, Nearby, Insterstellar Clouds. IX. The Serpens YSO Population As Observed With IRAC and MIPS	We discuss the results from the combined IRAC and MIPS c2d Spitzer Legacy observations of the Serpens star-forming region. In particular we present a set of criteria for isolating bona fide young stellar objects, YSO's, from the extensive background contamination by extra-galactic objects. We then discuss the properties of the resulting high confidence set of YSO's. We find 235 such objects in the 0.85 deg^2 field that was covered with both IRAC and MIPS. An additional set of 51 lower confidence YSO's outside this area is identified from the MIPS data combined with 2MASS photometry. We describe two sets of results, color-color diagrams to compare our observed source properties with those of theoretical models for star/disk/envelope systems and our own modeling of the subset of our objects that appear to be star+disks. These objects exhibit a very wide range of disk properties, from many that can be fit with actively accreting disks to some with both passive disks and even possibly debris disks. We find that the luminosity function of YSO's in Serpens extends down to at least a few x .001 Lsun or lower for an assumed distance of 260 pc. The lower limit may be set by our inability to distinguish YSO's from extra-galactic sources more than by the lack of YSO's at very low luminosities. A spatial clustering analysis shows that the nominally less-evolved YSO's are more highly clustered than the later stages and that the background extra-galactic population can be fit by the same two-point correlation function as seen in other extra-galactic studies. We also present a table of matches between several previous infrared and X-ray studies of the Serpens YSO population and our Spitzer data set.	What is the title of this paper? arXiv:0704.0009v1 [astro-ph] 2 Apr 2007The Spitzer c2d Survey of Large, Nearby, Insterstellar Clou ds. IX. The Serpens YSO Population As Observed With IRAC and MIPS Paul Harvey1, Bruno Mer´ ın2, Tracy L. Huard3, Luisa M. Rebull4, Nicholas Chapman5, Neal J. Evans II1, Philip C. Myers3 ABSTRACT Wedi
0704.0010	Sergei Ovchinnikov	Partial cubes: structures, characterizations, and constructions	Partial cubes are isometric subgraphs of hypercubes. Structures on a graph defined by means of semicubes, and Djokovi\'{c}'s and Winkler's relations play an important role in the theory of partial cubes. These structures are employed in the paper to characterize bipartite graphs and partial cubes of arbitrary dimension. New characterizations are established and new proofs of some known results are given. The operations of Cartesian product and pasting, and expansion and contraction processes are utilized in the paper to construct new partial cubes from old ones. In particular, the isometric and lattice dimensions of finite partial cubes obtained by means of these operations are calculated.	What is the title of this paper? arXiv:0704.0010v1 [math.CO] 31 Mar 2007Partial cubes: structures, characterizations, and constructions Sergei Ovchinnikov Mathematics Department San Francisco State University San Francisco, CA 94132 sergei@sfsu.edu May 8, 2006 Abstract Partial cubes are isometric subgraphs of hypercubes. Struc tu
0704.0011	Clifton Cunningham and Lassina Dembele	Computing genus 2 Hilbert-Siegel modular forms over $\Q(\sqrt{5})$ via the Jacquet-Langlands correspondence	In this paper we present an algorithm for computing Hecke eigensystems of Hilbert-Siegel cusp forms over real quadratic fields of narrow class number one. We give some illustrative examples using the quadratic field $\Q(\sqrt{5})$. In those examples, we identify Hilbert-Siegel eigenforms that are possible lifts from Hilbert eigenforms.	What is the title of this paper? arXiv:0704.0011v3 [math.NT] 20 Aug 2008COMPUTING GENUS 2HILBERT-SIEGEL MODULAR FORMS OVER Q(√ 5)VIA THE JACQUET-LANGLANDS CORRESPONDENCE CLIFTON CUNNINGHAM AND LASSINA DEMB ´EL´E Abstract. In this paper we present an algorithm for computing Hecke eigensystems of Hilbert-Siegel cusp forms over real
0704.0012	Dohoon Choi	Distribution of integral Fourier Coefficients of a Modular Form of Half Integral Weight Modulo Primes	Recently, Bruinier and Ono classified cusp forms $f(z) := \sum_{n=0}^{\infty} a_f(n)q ^n \in S_{\lambda+1/2}(\Gamma_0(N),\chi)\cap \mathbb{Z}[[q]]$ that does not satisfy a certain distribution property for modulo odd primes $p$. In this paper, using Rankin-Cohen Bracket, we extend this result to modular forms of half integral weight for primes $p \geq 5$. As applications of our main theorem we derive distribution properties, for modulo primes $p\geq5$, of traces of singular moduli and Hurwitz class number. We also study an analogue of Newman's conjecture for overpartitions.	What is the title of this paper? arXiv:0704.0012v1 [math.NT] 31 Mar 2007DISTRIBUTION OF INTEGRAL FOURIER COEFFICIENTS OF A MODULAR FORM OF HALF INTEGRAL WEIGHT MODULO PRIMES D. CHOI Abstract. Recently, Bruinier and Ono classiﬁed cusp forms f(z) :=/summationtext∞ n=0af(n)qn∈ Sλ+1 2(Γ0(N),χ)∩Z[[q]] that does not satisfy a certain d
0704.0013	Dohoon Choi and YoungJu Choie	$p$-adic Limit of Weakly Holomorphic Modular Forms of Half Integral Weight	Serre obtained the p-adic limit of the integral Fourier coefficient of modular forms on $SL_2(\mathbb{Z})$ for $p=2,3,5,7$. In this paper, we extend the result of Serre to weakly holomorphic modular forms of half integral weight on $\Gamma_{0}(4N)$ for $N=1,2,4$. A proof is based on linear relations among Fourier coefficients of modular forms of half integral weight. As applications we obtain congruences of Borcherds exponents, congruences of quotient of Eisentein series and congruences of values of $L$-functions at a certain point are also studied. Furthermore, the congruences of the Fourier coefficients of Siegel modular forms on Maass Space are obtained using Ikeda lifting.	What is the title of this paper? arXiv:0704.0013v2 [math.NT] 26 May 2008p-ADIC LIMIT OF THE FOURIER COEFFICIENTS OF WEAKLY HOLOMORPHIC MODULAR FORMS OF HALF INTEGRAL WEIGHT D. CHOI AND Y. CHOIE Abstract. Serreobtained the p-adiclimit ofthe integralFouriercoeﬃcientsof modular forms on SL2(Z) forp= 2,3,5,7. In this paper, we extend
0704.0014	Koichi Fujii	Iterated integral and the loop product	In this article we discuss a relation between the string topology and differential forms based on the theory of Chen's iterated integrals and the cyclic bar complex.	What is the title of this paper? arXiv:0704.0014v1 [math.CA] 1 Apr 2007Iterated integrals and the loop product Koichi Fujii 1 Introduction The purpose of this paper is to describe string topology from the vie wpoint of Chen’s iterated integrals. Let Mbe a compact closed oriented d-manifold and LMbe the free loop space of M, the s
0704.0015	Christian Stahn	Fermionic superstring loop amplitudes in the pure spinor formalism	The pure spinor formulation of the ten-dimensional superstring leads to manifestly supersymmetric loop amplitudes, expressed as integrals in pure spinor superspace. This paper explores different methods to evaluate these integrals and then uses them to calculate the kinematic factors of the one-loop and two-loop massless four-point amplitudes involving two and four Ramond states.	What is the title of this paper? arXiv:0704.0015v2 [hep-th] 10 Mar 2008Preprint typeset in JHEP style - HYPER VERSION Fermionic superstring loop amplitudes in the pure spinor formalism Christian Stahn Department of Physics, University of North Carolina Chapel Hill, NC 27599–3255, USA E-mail:stahn@physics.unc.edu Abstract: The pur
0704.0016	Chao-Hsi Chang, Tong Li, Xue-Qian Li and Yu-Ming Wang	Lifetime of doubly charmed baryons	In this work, we evaluate the lifetimes of the doubly charmed baryons $\Xi_{cc}^{+}$, $\Xi_{cc}^{++}$ and $\Omega_{cc}^{+}$. We carefully calculate the non-spectator contributions at the quark level where the Cabibbo-suppressed diagrams are also included. The hadronic matrix elements are evaluated in the simple non-relativistic harmonic oscillator model. Our numerical results are generally consistent with that obtained by other authors who used the diquark model. However, all the theoretical predictions on the lifetimes are one order larger than the upper limit set by the recent SELEX measurement. This discrepancy would be clarified by the future experiment, if more accurate experiment still confirms the value of the SELEX collaboration, there must be some unknown mechanism to be explored.	What is the title of this paper? arXiv:0704.0016v1 [hep-ph] 31 Mar 2007Lifetime of doubly charmed baryons Chao-Hsi Chang1,2∗, Tong Li3†, Xue-Qian Li3‡and Yu-Ming Wang4§ 1CCAST (World Laboratory), P.O.Box 8730, Beijing 100080, P. R. China 2Institute of Theoretical Physics, Chinese Academy of Scien ces, P.O.Box 2735, Beijing 100080
0704.0017	Nceba Mhlahlo, David H. Buckley, Vikram S. Dhillon, Steven B. Potter, Brian Warner and Patric A. Woudt	Spectroscopic Observations of the Intermediate Polar EX Hydrae in Quiescence	Results from spectroscopic observations of the Intermediate Polar (IP) EX Hya in quiescence during 1991 and 2001 are presented. Spin-modulated radial velocities consistent with an outer disc origin were detected for the first time in an IP. The spin pulsation was modulated with velocities near ~500-600 km/s. These velocities are consistent with those of material circulating at the outer edge of the accretion disc, suggesting corotation of the accretion curtain with material near the Roche lobe radius. Furthermore, spin Doppler tomograms have revealed evidence of the accretion curtain emission extending from velocities of ~500 km/s to ~1000 km/s. These findings have confirmed the theoretical model predictions of King & Wynn (1999), Belle et al. (2002) and Norton et al. (2004) for EX Hya, which predict large accretion curtains that extend to a distance close to the Roche lobe radius in this system. Evidence for overflow stream of material falling onto the magnetosphere was observed, confirming the result of Belle et al. (2005) that disc overflow in EX Hya is present during quiescence as well as outburst. It appears that the hbeta and hgamma spin radial velocities originated from the rotation of the funnel at the outer disc edge, while those of halpha were produced due to the flow of material along the field lines far from the white dwarf (narrow component) and close to the white dwarf (broad-base component), in agreement with the accretion curtain model.	What is the title of this paper? arXiv:0704.0017v1 [astro-ph] 31 Mar 2007Mon. Not.R. Astron. Soc. 000, 000–000 (0000) Printed 30 October 2018 (MN L ATEX style ﬁlev2.2) SpectroscopicObservationsoftheIntermediatePolarEXHy draein Quiescence N. Mhlahlo1,2⋆, D.A.H. Buckley2,V.S. Dhillon3, S.B. Potter2, B.Warner1and P.A. Woudt1 1Astron
0704.0018	Andreas Gustavsson	In quest of a generalized Callias index theorem	We give a prescription for how to compute the Callias index, using as regulator an exponential function. We find agreement with old results in all odd dimensions. We show that the problem of computing the dimension of the moduli space of self-dual strings can be formulated as an index problem in even-dimensional (loop-)space. We think that the regulator used in this Letter can be applied to this index problem.	What is the title of this paper? arXiv:0704.0018v2 [hep-th] 21 Apr 2007In quest of a generalized Callias index theorem Andreas Gustavsson1 F¨ orstamajgatan 24, S-415 10 G¨ oteborg, Sweden Abstract We give a prescription for how to compute the Callias index, u sing as regulator an exponential function. We ﬁnd agreement with old re
0704.0019	Norio Konno	Approximation for extinction probability of the contact process based on the Gr\"obner basis	In this note we give a new method for getting a series of approximations for the extinction probability of the one-dimensional contact process by using the Gr\"obner basis.	What is the title of this paper? arXiv:0704.0019v2 [math.PR] 23 Jun 2007Approximation for extinction probability of the contact process based on the Gr¨ obner basis Norio Konno Department of Applied Mathematics Yokohama National University Abstract . In this note we give a new method for getting a series of appro xi- mations for
0704.0020	The BABAR Collaboration, B. Aubert, et al	Measurement of the Hadronic Form Factor in D0 --> K- e+ nue Decays	The shape of the hadronic form factor f+(q2) in the decay D0 --> K- e+ nue has been measured in a model independent analysis and compared with theoretical calculations. We use 75 fb(-1) of data recorded by the BABAR detector at the PEPII electron-positron collider. The corresponding decay branching fraction, relative to the decay D0 --> K- pi+, has also been measured to be RD = BR(D0 --> K- e+ nue)/BR(D0 --> K- pi+) = 0.927 +/- 0.007 +/- 0.012. From these results, and using the present world average value for BR(D0 --> K- pi+), the normalization of the form factor at q2=0 is determined to be f+(0)=0.727 +/- 0.007 +/- 0.005 +/- 0.007 where the uncertainties are statistical, systematic, and from external inputs, respectively.	What is the title of this paper? arXiv:0704.0020v1 [hep-ex] 31 Mar 2007BABAR-PUB-07/015 SLAC-PUB-12417 Measurement of the Hadronic Form Factor in D0→K−e+νeDecays. B. Aubert, M. Bona, D. Boutigny, Y. Karyotakis, J. P. Lees, V. Po ireau, X. Prudent, V. Tisserand, and A. Zghiche Laboratoire de Physique des Particules, IN2P3/CNRS et
0704.0021	Vanessa Casagrande, Yuichi Togashi, Alexander S. Mikhailov	Molecular Synchronization Waves in Arrays of Allosterically Regulated Enzymes	Spatiotemporal pattern formation in a product-activated enzymic reaction at high enzyme concentrations is investigated. Stochastic simulations show that catalytic turnover cycles of individual enzymes can become coherent and that complex wave patterns of molecular synchronization can develop. The analysis based on the mean-field approximation indicates that the observed patterns result from the presence of Hopf and wave bifurcations in the considered system.	What is the title of this paper? arXiv:0704.0021v2 [nlin.PS] 24 Jul 2007Molecular Synchronization Waves in Arrays of Allosterical ly Regulated Enzymes Vanessa Casagrande,1Yuichi Togashi,2,∗and Alexander S. Mikhailov2,† 1Hahn-Meitner-Institut, Glienicker Straße 100, 14109 Berl in, Germany 2Fritz-Haber-Institut der Max-Planck-Gesel
0704.0022	Simon J.A. Malham and Anke Wiese	Stochastic Lie group integrators	We present Lie group integrators for nonlinear stochastic differential equations with non-commutative vector fields whose solution evolves on a smooth finite dimensional manifold. Given a Lie group action that generates transport along the manifold, we pull back the stochastic flow on the manifold to the Lie group via the action, and subsequently pull back the flow to the corresponding Lie algebra via the exponential map. We construct an approximation to the stochastic flow in the Lie algebra via closed operations and then push back to the Lie group and then to the manifold, thus ensuring our approximation lies in the manifold. We call such schemes stochastic Munthe-Kaas methods after their deterministic counterparts. We also present stochastic Lie group integration schemes based on Castell--Gaines methods. These involve using an underlying ordinary differential integrator to approximate the flow generated by a truncated stochastic exponential Lie series. They become stochastic Lie group integrator schemes if we use Munthe-Kaas methods as the underlying ordinary differential integrator. Further, we show that some Castell--Gaines methods are uniformly more accurate than the corresponding stochastic Taylor schemes. Lastly we demonstrate our methods by simulating the dynamics of a free rigid body such as a satellite and an autonomous underwater vehicle both perturbed by two independent multiplicative stochastic noise processes.	What is the title of this paper? arXiv:0704.0022v2 [math.NA] 16 Oct 2007STOCHASTIC LIE GROUP INTEGRATORS SIMON J.A. MALHAM∗ANDANKE WIESE∗ Abstract. We present Lie group integrators for nonlinear stochastic d iﬀerential equations with non-commutative vector ﬁelds whose solution evolves on a sm ooth ﬁnite dimensional manifold. Give
0704.0023	M. A. Loukitcheva, S. K. Solanki and S. White	ALMA as the ideal probe of the solar chromosphere	The very nature of the solar chromosphere, its structuring and dynamics, remains far from being properly understood, in spite of intensive research. Here we point out the potential of chromospheric observations at millimeter wavelengths to resolve this long-standing problem. Computations carried out with a sophisticated dynamic model of the solar chromosphere due to Carlsson and Stein demonstrate that millimeter emission is extremely sensitive to dynamic processes in the chromosphere and the appropriate wavelengths to look for dynamic signatures are in the range 0.8-5.0 mm. The model also suggests that high resolution observations at mm wavelengths, as will be provided by ALMA, will have the unique property of reacting to both the hot and the cool gas, and thus will have the potential of distinguishing between rival models of the solar atmosphere. Thus, initial results obtained from the observations of the quiet Sun at 3.5 mm with the BIMA array (resolution of 12 arcsec) reveal significant oscillations with amplitudes of 50-150 K and frequencies of 1.5-8 mHz with a tendency toward short-period oscillations in internetwork and longer periods in network regions. However higher spatial resolution, such as that provided by ALMA, is required for a clean separation between the features within the solar atmosphere and for an adequate comparison with the output of the comprehensive dynamic simulations.	What is the title of this paper? arXiv:0704.0023v1 [astro-ph] 31 Mar 2007Astrophysics and Space Science manuscript No. (will be inserted by the editor) ALMA as the ideal probe of the solar chromosphere Maria A. Loukitcheva ·Sami K. Solanki ·Stephen White Received: date / Accepted: date Abstract The very nature of the solar chromo
0704.0024	A.A. Serga, M. Kostylev, and B. Hillebrands	Formation of quasi-solitons in transverse confined ferromagnetic film media	The formation of quasi-2D spin-wave waveforms in longitudinally magnetized stripes of ferrimagnetic film was observed by using time- and space-resolved Brillouin light scattering technique. In the linear regime it was found that the confinement decreases the amplitude of dynamic magnetization near the lateral stripe edges. Thus, the so-called effective dipolar pinning of dynamic magnetization takes place at the edges. In the nonlinear regime a new stable spin wave packet propagating along a waveguide structure, for which both transversal instability and interaction with the side walls of the waveguide are important was observed. The experiments and a numerical simulation of the pulse evolution show that the shape of the formed waveforms and their behavior are strongly influenced by the confinement.	What is the title of this paper? Formation of quasi-solitons in transverse conned ferromagnetic lm media A.A. Serga1 Technische Universit at Kaiserslautern, Department of Physics and Forschungsschwerpunkt MINAS, D - 67663 Kaiserslautern, Germany M. Kostylev2 School of Physics, The University of Western Australia, 35 Stirling Hig
0704.0025	A. S. Mishchenko (1 and 2) and N. Nagaosa (1 and 3) ((1) CREST, Japan Science and Technology Agency, (2) Russian Research Centre ``Kurchatov Institute'', (3) The University of Tokyo)	Spectroscopic Properties of Polarons in Strongly Correlated Systems by Exact Diagrammatic Monte Carlo Method	We present recent advances in understanding of the ground and excited states of the electron-phonon coupled systems obtained by novel methods of Diagrammatic Monte Carlo and Stochastic Optimization, which enable the approximation-free calculation of Matsubara Green function in imaginary times and perform unbiased analytic continuation to real frequencies. We present exact numeric results on the ground state properties, Lehmann spectral function and optical conductivity of different strongly correlated systems: Frohlich polaron, Rashba-Pekar exciton-polaron, pseudo Jahn-Teller polaron, exciton, and interacting with phonons hole in the t-J model.	What is the title of this paper? arXiv:0704.0025v1 [cond-mat.str-el] 2 Apr 2007Spectroscopic Properties of Polarons in Strongly Correlated Systems by Exact Diagrammatic Monte Carlo Method A. S. Mishchenko1,2and N. Nagaosa3 1CREST, Japan Science and Technology Agency (JST), AIST, 1-1 -1, Higashi, Tsukuba 305-8562, Japan. 2Russian
0704.0026	Robert P. C. de Marrais	Placeholder Substructures II: Meta-Fractals, Made of Box-Kites, Fill Infinite-Dimensional Skies	Zero-divisors (ZDs) derived by Cayley-Dickson Process (CDP) from N-dimensional hypercomplex numbers (N a power of 2, at least 4) can represent singularities and, as N approaches infinite, fractals -- and thereby,scale-free networks. Any integer greater than 8 and not a power of 2 generates a meta-fractal or "Sky" when it is interpreted as the "strut constant" (S) of an ensemble of octahedral vertex figures called "Box-Kites" (the fundamental building blocks of ZDs). Remarkably simple bit-manipulation rules or "recipes" provide tools for transforming one fractal genus into others within the context of Wolfram's Class 4 complexity.	What is the title of this paper? arXiv:0704.0026v3 [math.RA] 22 Nov 2007Placeholder Substructures II: Meta-Fractals, Made of Box-Kites, FillInﬁnite-Dimensional Skies RobertP. C.de Marrais∗ Thothic Technology Partners,P.O.Box 3083,Plymouth MA023 61 March 2, 2022 Abstract Zero-divisors (ZDs)derivedbyCayley-Dickson Process(CD P)from
0704.0027	M. O. Goerbig, J.-N. Fuchs, K. Kechedzhi, Vladimir I. Fal'ko	Filling-Factor-Dependent Magnetophonon Resonance in Graphene	We describe a peculiar fine structure acquired by the in-plane optical phonon at the Gamma-point in graphene when it is brought into resonance with one of the inter-Landau-level transitions in this material. The effect is most pronounced when this lattice mode (associated with the G-band in graphene Raman spectrum) is in resonance with inter-Landau-level transitions 0 -> (+,1) and (-,1) -> 0, at a magnetic field B_0 ~ 30 T. It can be used to measure the strength of the electron-phonon coupling directly, and its filling-factor dependence can be used experimentally to detect circularly polarized lattice modes.	What is the title of this paper? arXiv:0704.0027v4 [cond-mat.mes-hall] 24 Sep 2009Filling-Factor-Dependent Magnetophonon Resonance in Gra phene M. O. Goerbig,1J.-N. Fuchs,1K. Kechedzhi,2and Vladimir I. Fal’ko2 1Laboratoire de Physique des Solides, Univ. Paris-Sud, CNRS UMR 8502, F-91405 Orsay, France and 2Department of Physics, L
0704.0028	P\'eter E. Frenkel	Pfaffians, hafnians and products of real linear functionals	We prove pfaffian and hafnian versions of Lieb's inequalities on determinants and permanents of positive semi-definite matrices. We use the hafnian inequality to improve the lower bound of R\'ev\'esz and Sarantopoulos on the norm of a product of linear functionals on a real Euclidean space (this subject is sometimes called the `real linear polarization constant' problem).	What is the title of this paper? arXiv:0704.0028v2 [math.CA] 26 Feb 2008 /C8/CU/CPꜶ/CP/D2/D7/B8 /CW/CP/CU/D2/CX/CP/D2/D7 /CP/D2/CS /D4/D6/D3 /CS/D9 /D8/D7 /D3/CU /D6/CT/CP/D0 /D0/CX/D2/CT/CP/D6/CU/D9/D2 /D8/CX/D3/D2/CP/D0/D7/C8 /GH/D8/CT/D6 /BX/BA /BY /D6/CT/D2/CZ /CT/D0∗/BT/D0/CU/D6/GH/CS /CA/GH/D2 /DD/CX /C1/D2/D7/D8/CX/D8/D9/D
0704.0029	Zhan Shu, Xiao-Lin Chen and Wei-Zhen Deng	Understanding the Flavor Symmetry Breaking and Nucleon Flavor-Spin Structure within Chiral Quark Model	In $\XQM$, a quark can emit Goldstone bosons. The flavor symmetry breaking in the Goldstone boson emission process is used to intepret the nucleon flavor-spin structure. In this paper, we study the inner structure of constituent quarks implied in $\XQM$ caused by the Goldstone boson emission process in nucleon. From a simplified model Hamiltonian derived from $\XQM$, the intrinsic wave functions of constituent quarks are determined. Then the obtained transition probabilities of the emission of Goldstone boson from a quark can give a reasonable interpretation to the flavor symmetry breaking in nucleon flavor-spin structure.	What is the title of this paper? arXiv:0704.0029v2 [hep-ph] 26 Apr 2007Understanding the Flavor Symmetry Breaking and Nucleon Flavor-Spin Structure within Chiral Quark Model Zhan Shu, Xiao-Lin Chen, and Wei-Zhen Deng∗ Department of Physics, Peking University, Beijing 100871, China Abstract InχQM, a quark can emit Goldstone bosons
0704.0030	J.P.Hague and N.d'Ambrumenil	Tuning correlation effects with electron-phonon interactions	We investigate the effect of tuning the phonon energy on the correlation effects in models of electron-phonon interactions using DMFT. In the regime where itinerant electrons, instantaneous electron-phonon driven correlations and static distortions compete on similar energy scales, we find several interesting results including (1) A crossover from band to Mott behavior in the spectral function, leading to hybrid band/Mott features in the spectral function for phonon frequencies slightly larger than the band width. (2) Since the optical conductivity depends sensitively on the form of the spectral function, we show that such a regime should be observable through the low frequency form of the optical conductivity. (3) The resistivity has a double kondo peak arrangement	What is the title of this paper? arXiv:0704.0030v1 [cond-mat.str-el] 31 Mar 2007Tuning correlation eﬀects with electron-phonon interactions J.P.Hague and N.d’Ambrumenil Department of Physics, University of Warwick, CV4 7AL, U.K. We investigate the eﬀect of tuning the phonon energy on the co rrelation ef- fects in models of electr
0704.0031	V. M. Biryukov (Serpukhov, IHEP)	Crystal channeling of LHC forward protons with preserved distribution in phase space	We show that crystal can trap a broad (x, x', y, y', E) distribution of particles and channel it preserved with a high precision. This sampled-and-hold distribution can be steered by a bent crystal for analysis downstream. In simulations for the 7 TeV Large Hadron Collider, a crystal adapted to the accelerator lattice traps 90% of diffractively scattered protons emerging from the interaction point with a divergence 100 times the critical angle. We set the criterion for crystal adaptation improving efficiency ~100-fold. Proton angles are preserved in crystal transmission with accuracy down to 0.1 microrad. This makes feasible a crystal application for measuring very forward protons at the LHC.	What is the title of this paper? Crystal channeling of LHC forward protons with preserved distribution in phase space V .M. Biryukov♦ Institute for High Energy Physics, Protvino, 142281, Russia Abstract We show that crystal can trap a broad ( x, x', y, y', E ) distribution of particles and channel it preserved with a high precision
0704.0032	A. Esteban-Pretel, R. Tom\`as and J. W. F. Valle	Probing non-standard neutrino interactions with supernova neutrinos	We analyze the possibility of probing non-standard neutrino interactions (NSI, for short) through the detection of neutrinos produced in a future galactic supernova (SN).We consider the effect of NSI on the neutrino propagation through the SN envelope within a three-neutrino framework, paying special attention to the inclusion of NSI-induced resonant conversions, which may take place in the most deleptonised inner layers. We study the possibility of detecting NSI effects in a Megaton water Cherenkov detector, either through modulation effects in the $\bar\nu_e$ spectrum due to (i) the passage of shock waves through the SN envelope, (ii) the time dependence of the electron fraction and (iii) the Earth matter effects; or, finally, through the possible detectability of the neutronization $\nu_e$ burst. We find that the $\bar\nu_e$ spectrum can exhibit dramatic features due to the internal NSI-induced resonant conversion. This occurs for non-universal NSI strengths of a few %, and for very small flavor-changing NSI above a few$\times 10^{-5}$.	What is the title of this paper? arXiv:0704.0032v1 [hep-ph] 2 Apr 2007IFIC/07-03 Probing non-standard neutrino interactions with supernov a neutrinos A. Esteban-Pretel, R. Tom` as and J. W. F. Valle1 1AHEP Group, Institut de F´ ısica Corpuscular - C.S.I.C/Univ ersitat de Val` encia Ediﬁci Instituts d’Investigaci´ o, Apt. 22085, E
0704.0033	Maxim A. Yurkin, Valeri P. Maltsev, Alfons G. Hoekstra	Convergence of the discrete dipole approximation. I. Theoretical analysis	We performed a rigorous theoretical convergence analysis of the discrete dipole approximation (DDA). We prove that errors in any measured quantity are bounded by a sum of a linear and quadratic term in the size of a dipole d, when the latter is in the range of DDA applicability. Moreover, the linear term is significantly smaller for cubically than for non-cubically shaped scatterers. Therefore, for small d errors for cubically shaped particles are much smaller than for non-cubically shaped. The relative importance of the linear term decreases with increasing size, hence convergence of DDA for large enough scatterers is quadratic in the common range of d. Extensive numerical simulations were carried out for a wide range of d. Finally we discuss a number of new developments in DDA and their consequences for convergence.	What is the title of this paper? 1 Convergence of the Discrete Dipole Approximatio n. Part 1: Theoretical Analysis . Maxim A. Yurkin Faculty of Science, Section Computational Science, of the University of Amsterdam, Kruislaan 403, 1098 SJ, Amsterdam, The Netherlands and Institute of Chemical Kinetics and Combustion, Siber
0704.0034	Vasily Ogryzko	Origin of adaptive mutants: a quantum measurement?	This is a supplement to the paper arXiv:q-bio/0701050, containing the text of correspondence sent to Nature in 1990.	What is the title of this paper? Sent to Nature in 1990 Abstract This is a supplement to the paper arXiv:q-bio/0701050, containing the text of correspondence sent to Nature in 1990. Origin of adaptive mutants: a quantum measurement? Sir, - Several recent works described non -random induction of adaptive mutation
0704.0035	Maxim A. Yurkin, Valeri P. Maltsev, Alfons G. Hoekstra	Convergence of the discrete dipole approximation. II. An extrapolation technique to increase the accuracy	We propose an extrapolation technique that allows accuracy improvement of the discrete dipole approximation computations. The performance of this technique was studied empirically based on extensive simulations for 5 test cases using many different discretizations. The quality of the extrapolation improves with refining discretization reaching extraordinary performance especially for cubically shaped particles. A two order of magnitude decrease of error was demonstrated. We also propose estimates of the extrapolation error, which were proven to be reliable. Finally we propose a simple method to directly separate shape and discretization errors and illustrated this for one test case.	What is the title of this paper? 1Convergence of the discrete dipole approximation. II. An extrapolation technique to increase the accuracy. Maxim A. Yurkin Faculty of Science, Section Computational Sc ience, of the University of Amsterdam, Kruislaan 403, 1098 SJ, Amsterdam, The Netherlands and Institute of Chemical Kinetic
0704.0036	Liming Wang and Eduardo D. Sontag	A remark on the number of steady states in a multiple futile cycle	The multisite phosphorylation-dephosphorylation cycle is a motif repeatedly used in cell signaling. This motif itself can generate a variety of dynamic behaviors like bistability and ultrasensitivity without direct positive feedbacks. In this paper, we study the number of positive steady states of a general multisite phosphorylation-dephosphorylation cycle, and how the number of positive steady states varies by changing the biological parameters. We show analytically that (1) for some parameter ranges, there are at least n+1 (if n is even) or n (if n is odd) steady states; (2) there never are more than 2n-1 steady states (in particular, this implies that for n=2, including single levels of MAPK cascades, there are at most three steady states); (3) for parameters near the standard Michaelis-Menten quasi-steady state conditions, there are at most n+1 steady states; and (4) for parameters far from the standard Michaelis-Menten quasi-steady state conditions, there is at most one steady state.	What is the title of this paper? arXiv:0704.0036v2 [q-bio.QM] 20 Jul 2007A remark on the number of steady states in a multiple futile cy cle Liming Wang and Eduardo D. Sontag Department of Mathematics Rutgers University, New Brunswick, NJ, USA Abstract The multisite phosphorylation-dephosphorylation cycle is a motif rep eatedly u
0704.0037	Maxim A. Yurkin, Valeri P. Maltsev, Alfons G. Hoekstra	The discrete dipole approximation for simulation of light scattering by particles much larger than the wavelength	In this manuscript we investigate the capabilities of the Discrete Dipole Approximation (DDA) to simulate scattering from particles that are much larger than the wavelength of the incident light, and describe an optimized publicly available DDA computer program that processes the large number of dipoles required for such simulations. Numerical simulations of light scattering by spheres with size parameters x up to 160 and 40 for refractive index m=1.05 and 2 respectively are presented and compared with exact results of the Mie theory. Errors of both integral and angle-resolved scattering quantities generally increase with m and show no systematic dependence on x. Computational times increase steeply with both x and m, reaching values of more than 2 weeks on a cluster of 64 processors. The main distinctive feature of the computer program is the ability to parallelize a single DDA simulation over a cluster of computers, which allows it to simulate light scattering by very large particles, like the ones that are considered in this manuscript. Current limitations and possible ways for improvement are discussed.	What is the title of this paper? The discrete dipole approximation for simulation of light scattering by particles much larg er than the wavelength M.A. Yurkina,b∗, V.P. Maltsevb,c, and A.G. Hoekstraa∗ a Section Computational Science, Faculty of Sc ience, University of Amsterdam, Kruislaan 403, 1098 SJ, Amsterdam, The Nether
0704.0038	Maxim A. Yurkin, Alfons G. Hoekstra	The discrete dipole approximation: an overview and recent developments	We present a review of the discrete dipole approximation (DDA), which is a general method to simulate light scattering by arbitrarily shaped particles. We put the method in historical context and discuss recent developments, taking the viewpoint of a general framework based on the integral equations for the electric field. We review both the theory of the DDA and its numerical aspects, the latter being of critical importance for any practical application of the method. Finally, the position of the DDA among other methods of light scattering simulation is shown and possible future developments are discussed.	What is the title of this paper? The discrete dipole approximation : an overview and recent developments M.A. Yurkina,b and A.G. Hoekstraa a Section Computational Science , Faculty of Science , University of Amsterdam, Kruislaan 403, 1098 SJ, Amsterdam, T he Netherlands b Institut e of Chemical Kinetics and Combustion,
0704.0039	Jose A. Oller and Luis Roca	Scalar radius of the pion and zeros in the form factor	The quadratic pion scalar radius, \la r^2\ra^\pi_s, plays an important role for present precise determinations of \pi\pi scattering. Recently, Yndur\'ain, using an Omn\`es representation of the null isospin(I) non-strange pion scalar form factor, obtains \la r^2\ra^\pi_s=0.75\pm 0.07 fm^2. This value is larger than the one calculated by solving the corresponding Muskhelishvili-Omn\`es equations, \la r^2\ra^\pi_s=0.61\pm 0.04 fm^2. A large discrepancy between both values, given the precision, then results. We reanalyze Yndur\'ain's method and show that by imposing continuity of the resulting pion scalar form factor under tiny changes in the input \pi\pi phase shifts, a zero in the form factor for some S-wave I=0 T-matrices is then required. Once this is accounted for, the resulting value is \la r^2\ra_s^\pi=0.65\pm 0.05 fm^2. The main source of error in our determination is present experimental uncertainties in low energy S-wave I=0 \pi\pi phase shifts. Another important contribution to our error is the not yet settled asymptotic behaviour of the phase of the scalar form factor from QCD.	What is the title of this paper? arXiv:0704.0039v2 [hep-ph] 25 Apr 2007Scalar radius of the pion and zeros in the form factor Jos´ e A. Oller and Luis Roca Departamento de F´ ısica. Universidad de Murcia. E-30071, Murcia. Spain. oller@um.es , luisroca@um.es Abstract The quadratic pion scalar radius, /angbracketleftr2/angbracketri
0704.0040	Mihai Popa	Multilinear function series in conditionally free probability with amalgamation	As in the cases of freeness and monotonic independence, the notion of conditional freeness is meaningful when complex-valued states are replaced by positive conditional expectations. In this framework, the paper presents several positivity results, a version of the central limit theorem and an analogue of the conditionally free R-transform constructed by means of multilinear function series.	What is the title of this paper? arXiv:0704.0040v3 [math.OA] 5 Sep 2008MULTILINEAR FUNCTION SERIES IN CONDITIONALLY FREE PROBABILITY WITH AMALGAMATION MIHAI POPA Abstract. As in the cases of freeness and monotonic independence, the notion of conditional freeness is meaningful when complex- valued states are replaced by positive c
0704.0041	Debashish Goswami	Quantum Group of Isometries in Classical and Noncommutative Geometry	We formulate a quantum generalization of the notion of the group of Riemannian isometries for a compact Riemannian manifold, by introducing a natural notion of smooth and isometric action by a compact quantum group on a classical or noncommutative manifold described by spectral triples, and then proving the existence of a universal object (called the quantum isometry group) in the category of compact quantum groups acting smoothly and isometrically on a given (possibly noncommutative) manifold satisfying certain regularity assumptions. In fact, we identify the quantum isometry group with the universal object in a bigger category, namely the category of `quantum families of smooth isometries', defined along the line of Woronowicz and Soltan. We also construct a spectral triple on the Hilbert space of forms on a noncommutative manifold which is equivariant with respect to a natural unitary representation of the quantum isometry group. We give explicit description of quantum isometry groups of commutative and noncommutative tori, and in this context, obtain the quantum double torus defined in \cite{hajac} as the universal quantum group of holomorphic isometries of the noncommutative torus.	What is the title of this paper? arXiv:0704.0041v4 [math.QA] 26 Oct 2007Quantum Group of Isometries in Classical and Noncommutative Geometry by Debashish Goswami1 Stat-Math Unit, Kolkata Centre, Indian Statistical Institute 203, B. T. Road, Kolkata 700 108, India Abstract Weformulateaquantumgeneralizationofthenotionofthegroupof R