Cross-listings

gr-qc/0511071 [abs, ps, pdf, other] :: Title: The present universe in the Einstein frame, metric-affine R+1/R gravity
Authors: Nikodem J. Poplawski
Comments: 11 pages; changed title, corrected terminology, extended analysis of cosmological parameters

We study the present, flat isotropic universe in 1/R-modified gravity. We use the Palatini (metric-affine) variational principle and the Einstein (metric-compatible connected) conformal frame. We show that the energy density scaling deviates from the usual scaling for nonrelativistic matter, and the largest deviation occurs in the present epoch. We find that the current deceleration parameter derived from the apparent matter density parameter is consistent with observations. There is also a small overlap between the predicted and observed values for the redshift-derivative of the deceleration parameter. The predicted redshift of the deceleration-to-acceleration transition agrees with that in the Lambda-CDM model but it is larger than the value estimated from SNIa observations.
gr-qc/0605021 [abs, ps, pdf, other] :: Title: Parameter estimation of coalescing supermassive black hole binaries with LISA
Authors: K G Arun
Comments: 12 pages, 5 figures (eps) significant revision, accepted for publication in Phys. Rev. D

Laser Interferometer Space Antenna (LISA) will routinely observe coalescences of supermassive black hole (BH) binaries up to very high redshifts. LISA can measure mass parameters of such coalescences to a relative accuracy of $10^{-4}-10^{-6}$, for sources at a distance of 3 Gpc. The problem of parameter estimation of massive nonspinning binary black holes using post-Newtonian (PN) phasing formula is studied in the context of LISA. Specifically, the performance of the 3.5PN templates is contrasted against its 2PN counterpart using a waveform which is averaged over the LISA pattern functions. The improvement due to the higher order corrections to the phasing formula is examined by calculating the errors in the estimation of mass parameters at each order. The estimation of the mass parameters ${\cal M}$ and $\eta$ are significantly enhanced by using the 3.5PN waveform instead of the 2PN one. For an equal mass binary of $2\times10^6M_\odot$ at a luminosity distance of 3 Gpc, the improvement in chirp mass is $\sim 11%$ and that of $\eta$ is $\sim 39%$. Estimation of coalescence time $t_c$ worsens by 43%. The improvement is larger for the unequal mass binary mergers. These results are compared to the ones obtained using a non-pattern averaged waveform. The errors depend very much on the location and orientation of the source and general conclusions cannot be drawn without performing Monte Carlo simulations. Finally the effect of the choice of the lower frequency cut-off for LISA on the parameter estimation is studied.
gr-qc/0606118 [abs, ps, pdf, other] :: Title: Proposed observations of gravity waves from the early Universe via "Millikan oil drops"
Authors: R. Y. Chiao
Comments: 10 pages, 2 figures, NASA "Quantum-to-Cosmos" conference proceedings to be published in IJMPD

Pairs of Planck-mass drops of superfluid helium coated by electrons (i.e., ``Millikan oil drops''), when levitated in a superconducting magnetic trap, can be efficient quantum transducers between electromagnetic (EM) and gravitational (GR) radiation. This leads to the possibility of a Hertz-like experiment, in which EM waves are converted at the source into GR waves, and then back-converted at the receiver from GR waves back into EM waves. Detection of the gravity-wave analog of the cosmic microwave background using these drops can discriminate between various theories of the early Universe.
hep-th/0606274 [abs, ps, pdf, other] :: Title: Conformal symmetry of gravity and the cosmological constant problem
Authors: Mariano Cadoni
Comments: 5 pages, No figures

In absence of matter Einstein gravity with a cosmological constant $\Lambda$ can be formulated as a scale-free theory depending only on the dimensionless coupling constant $G \Lambda$, where $G$ is Newton constant. In regimes where only the dynamics of the conformal factor of the metric is relevant, Einstein gravity can be described by a conformal field theory in four dimensions. In the cosmological framework the model describes the usual Friedmann-Robertson-Walker flat universe. The conformal symmetry of the gravity sector is broken by coupling with matter. The dimensional coupling constants $G$ and $\Lambda$ are introduced by different terms in this coupling. If the vacuum of quantum matter fields respects the symmetry of the gravity sector, the vacuum energy has to be zero and the ``physical'' cosmological constant is generated by the coupling of gravity with matter. This could explain the tiny value of the observed energy density driving the accelerating expansion of the universe.

Replacements

astro-ph/0505478 [abs, ps, pdf, other] :: Title: A new inflaton model beginning near the Planck epoch
Authors: Reuven Opher, Ana Pelinson
Comments: 7 pages, minor changes, improved discussion. To appear in Braz.J.Phys
Note: replaced with revised version Fri, 30 Jun 2006 16:05:58 GMT (6kb)
astro-ph/0506320 [abs, ps, pdf, other] :: Title: Galaxy clustering from COMBO-17: The halo occupation distribution at <z>=0.6
Authors: S. Phleps, J.A. Peacock, K. Meisenheimer, C. Wolf
Comments: 12 pages, 10 figures, accepted for publication by A&A
Note: replaced with revised version Fri, 30 Jun 2006 13:54:51 GMT (256kb)
astro-ph/0512206 [abs, ps, pdf, other] :: Title: UV pumping of hyperfine transitions in the light elements, with application to 21-cm hydrogen and 92-cm deuterium lines from the early universe
Authors: Leonid Chuzhoy, Paul R. Shapiro
Comments: 7 pages, 6 figures, submitted to ApJ
Note: replaced with revised version Fri, 30 Jun 2006 18:08:45 GMT (30kb)
astro-ph/0512336 [abs, ps, pdf, other] :: Title: Inflation without inflatons
Authors: Reuven Opher, Ana Pelinson
Comments: 11 pages, 2 figures. Revised version, accepted for publication in Phys. Rev. D
Note: replaced with revised version Fri, 30 Jun 2006 15:23:43 GMT (44kb)
astro-ph/0601125 [abs, ps, pdf, other] :: Title: The early X-ray emission from GRBs
Authors: P.T. O'Brien, R. Willingale, J. Osborne, M.R. Goad, K.L. Page, S. Vaughan, E. Rol, A. Beardmore, O. Godet, C. Hurkett, A. Wells, B. Zhang, S. Kobayashi, D.N. Burrows, J.A. Nousek, J.A. Kennea, A. Falcone, D. Grupe, N. Gehrels, S. Barthelmy, J. Cannizzo, J. Cummings, J. Hill, H. Krimm, G. Chincarini, G. Tagliaferri, S. Campana, A. Moretti, P. Giommi, M. Perri, V. Mangano, V. LaParola
Comments: Submitted to ApJ on December 16. Revised following referee's comments. Accepted for publication in ApJ. Minor correction to Fig. 14 caption and updated references
Note: replaced with revised version Fri, 30 Jun 2006 09:54:03 GMT (459kb)
astro-ph/0601544 [abs, ps, pdf, other] :: Title: Early Dark Energy Cosmologies
Authors: Michael Doran, Georg Robbers
Comments: 6 pages, 3 figures; references added, matches published version
Journal-ref: JCAP 06(2006) 026
Note: replaced with revised version Fri, 30 Jun 2006 13:04:02 GMT (61kb)
astro-ph/0602417 [abs, ps, pdf, other] :: Title: Corona of Magnetars
Authors: Andrei M. Beloborodov, Christopher Thompson
Comments: 69 pages, 14 figures, submitted to ApJ
Note: replaced with revised version Fri, 30 Jun 2006 00:51:10 GMT (119kb)
astro-ph/0603752 [abs, ps, pdf, other] :: Title: A self-consistent model of isolated neutron stars: the case of the X-ray pulsar RX J0720.4-3125
Authors: J.F.Perez-Azorin, J.A.Pons, J.A.Miralles, G. Miniutti
Comments: Replaced with extended version, 13 pages, 7 figures
Note: replaced with revised version Fri, 30 Jun 2006 09:00:40 GMT (85kb)
astro-ph/0604355 [abs, ps, pdf, other] :: Title: A Faint New Milky Way Satellite in Bootes
Authors: V. Belokurov (1), D. B. Zucker (1), N. W. Evans (1), M. I. Wilkinson (1), M. J. Irwin (1), S. Hodgkin (1), D. M. Bramich (1), J. M. Irwin (1), G. Gilmore (1), B. Willman (2), S. Vidrih (1), H. J. Newberg (3), R. F. G. Wyse (4), M. Fellhauer (1), P. C. Hewett (1), N. Cole (3), E. F. Bell (5), T. C. Beers (6), C. M. Rockosi (7), B. Yanny (8), E. K. Grebel (9), D. P. Schneider (10), R. Lupton (11), J. C. Barentine (12), H. Brewington (12), J. Brinkmann (12), M. Harvanek (12), S. J.Kleinman (12), J. Krzesinski (12,13), D. Long (12), A. Nitta (12), J. A. Smith (14), S. A. Snedden (12) ((1) Cambridge University, (2) New York University, (3) Rensselaer Polytechnical Institute, (4) JHU, (5) MPIA, Heidelberg, (6) Michigan State University, (7) Lick Observatory, UCSC, (8) FNAL, (9) University of Basel, (10) Pennsylvania State University, (11) Princeton University, (12) Apache Point Observatory, (13) Cracow Pedagogical University, (14) LANL)
Comments: ApJ (Letters), in press
Note: replaced with revised version Thu, 29 Jun 2006 21:49:38 GMT (279kb)
astro-ph/0604356 [abs, ps, pdf, other] :: Title: Scalar quantities as detectors of non-Gaussianity on CMB maps
Authors: C. Monteserin, R.B. Barreiro, E. Martinez-Gonzalez, J.L. Sanz
Comments: Accepted for publication in MNRAS. 13 pages, 3 figures
Note: replaced with revised version Fri, 30 Jun 2006 11:18:28 GMT (231kb)
astro-ph/0605463 [abs, ps, pdf, other] :: Title: A 0.8-2.4 microns spectral atlas of Active Galactic Nuclei
Authors: R. Riffel, A. Rodriguez-Ardila, M. G. Pastoriza
Comments: 39 pages, 17 figures, accepted for publication in Astronomy and Astrophysics (15/05/2006)
Note: replaced with revised version Thu, 29 Jun 2006 21:56:09 GMT (416kb)
astro-ph/0606502 [abs, ps, pdf, other] :: Title: Integral Field Spectroscopy of the Extended Emission-Line Region of 3C 249.1
Authors: Hai Fu, Alan Stockton (IfA Hawaii)
Comments: Accepted for publication in ApJ. 8 pages including 7 figures
Note: replaced with revised version Thu, 29 Jun 2006 21:46:52 GMT (863kb)
astro-ph/0606597 [abs, pdf] :: Title: The Integral Field Spectrograph of SPHERE: the Planet Finder for VLT
Authors: R. U. Claudi (1), M. Turatto (1), J. Antichi (1), R. Gratton (1), S. Scuderi (2), E. Cascone (3), D. Mesa (1), S. Desidera (1), A. Baruffolo (1), A. Berton (1,4), P. Bagnara (1), E. Giro (1), P. Bruno (2), D. Fantinel (1), J.-L. Beuzit (5), P. Puget (6), K. Dohlen (7) ((1) INAF/OAPd, (2) INAF/OACt, (3) INAF/OAC, (4) MPIA-Heidelberg, (5) LAOG, (6) LESIA, (7) LAM)
Comments: Proc. SPIE 6269 (2006), 10 pages, 6 figures, PDF file
Note: replaced with revised version Fri, 30 Jun 2006 17:24:22 GMT (327kb)
astro-ph/0606730 [abs, ps, pdf, other] :: Title: Hickson 62.I. Kinematics of NGC4778
Authors: M. Spavone, E. Iodice, G. Longo, M. Paolillo, S. Sodani
Comments: 18 pages, 8 figures, accepted for pubblication in Astronomy and Astrophysics
Note: replaced with revised version Fri, 30 Jun 2006 11:54:00 GMT (389kb)
hep-ph/0405172 [abs, ps, pdf, other] :: Title: Status of global fits to neutrino oscillations
Authors: M. Maltoni, T. Schwetz, M.A. Tortola, J.W.F. Valle
Comments: v5: Appendix C added providing updated results which take into account all developments as of June 2006, namely: new SSM, new SNO salt data, latest K2K and MINOS data
Journal-ref: New J.Phys. 6 (2004) 122
Note: replaced with revised version Fri, 30 Jun 2006 18:03:28 GMT (312kb)
hep-ph/0505017 [abs, ps, pdf, other] :: Title: The intrinsic and oscillated astrophysical neutrino flavor ratios
Authors: H. Athar, C. S. Kim, Jake Lee
Comments: 23 pages, 5 figures, typos corrected, appeared in Mod. Phys. Lett. A
Journal-ref: Mod.Phys.Lett. A21 (2006) 1049-1066
Note: replaced with revised version Fri, 30 Jun 2006 14:35:03 GMT (210kb)
hep-ph/0606137 [abs, ps, pdf, other] :: Title: Elliptic Inflation: Generating the curvature perturbation without slow-roll
Authors: Tomohiro Matsuda
Comments: 26pages, 8figures, added comments on fluctuations along equipotential surface
Note: replaced with revised version Fri, 30 Jun 2006 05:21:41 GMT (57kb)
hep-th/0604164 [abs, ps, pdf, other] :: Title: On the consistency of Lorentz invariance violation in QED induced by fermions in constant axial-vector background
Authors: J. Alfaro, A.A. Andrianov, M. Cambiaso, P. Giacconi, R. Soldati
Comments: 10 pages, minor revision for publication in Phys.Lett. B
Note: replaced with revised version Fri, 30 Jun 2006 18:25:40 GMT (12kb)
hep-th/0606031 [abs, ps, pdf, other] :: Title: Wilson Line Inflation
Authors: A. Avgoustidis, D. Cremades, F. Quevedo
Comments: 33 pages. Contribution to O.Obregon's Festschrift. v2: References added
Note: replaced with revised version Fri, 30 Jun 2006 10:30:50 GMT (33kb)
quant-ph/0511222 [abs, ps, pdf, other] :: Title: Proposal of an experimentally accessible measure of many-fermion entanglement
Authors: M. Kindermann
Comments: 5 pages, 3 figures, published version
Subj-class: Quantum Physics; Mesoscopic Systems and Quantum Hall Effect
Journal-ref: Phys. Rev. Lett. 96, 240403 (2006)
Note: replaced with revised version Thu, 29 Jun 2006 23:00:54 GMT (18kb)

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gr-qc/0606121 [abs, ps, pdf, other] :: Title: Uniform discretizations: a quantization procedure for totally constrained systems including gravity
Authors: Miguel Campiglia, Cayetano Di Bartolo, Rodolfo Gambini, Jorge Pullin
Comments: 4 pages, Revtex

We present a new method for the quantization of totally constrained systems including general relativity. The method consists in constructing discretized theories that have a well defined and controlled continuum limit. The discrete theories are constraint-free and can be readily quantized. This provides a framework where one can introduce a relational notion of time and that nevertheless approximates in a well defined fashion the theory of interest. The method is equivalent to the group averaging procedure for many systems where the latter makes sense and provides a generalization otherwise. In the continuum limit it can be shown to contain, under certain assumptions, the ``master constraint'' of the ``Phoenix project''. It also provides a correspondence principle with the classical theory that does not require to consider the semiclassical limit.
hep-ph/0606256 [abs, ps, pdf, other] :: Title: Nonlinear Inflaton Fragmentation after Preheating
Authors: Gary N. Felder, Lev Kofman
Comments: 9 pages, 6 figs

We consider the nonlinear dynamics of inflaton fragmentation during and after preheating in the simplest model of chaotic inflation. While the earlier regime of parametric resonant particle production and the later turbulent regime of interacting fields evolving towards equilibrium are well identified and understood, the short intermediate stage of violent nonlinear dynamics remains less explored. Lattice simulations of fully nonlinear preheating dynamics show specific features of this intermediate stage: occupation numbers of the scalar particles are peaked, scalar fields become significantly non-gaussian and the field dynamics become chaotic and irreversible. Visualization of the field dynamics in configuration space reveals that nonlinear interactions generate non-gaussian inflaton inhomogeneities with very fast growing amplitudes. The peaks of the inflaton inhomogeneities coincide with the peaks of the scalar field(s) produced by parametric resonance. When the inflaton peaks reach their maxima, they stop growing and begin to expand. The subsequent dynamics is determined by expansion and superposition of the scalar waves originating from the peaks. Multiple wave superposition results in phase mixing and turbulent wave dynamics. Thus, the short intermediate stage is defined by the formation, expansion and collision of bubble-like field inhomogeneities associated with the peaks of the original gaussian field. This process is qualitatively similar to the bubble-like inflaton fragmentation that occurs during tachyonic preheating after hybrid or new inflation.

Replacements

astro-ph/0508580 [abs, ps, pdf, other] :: Title: Optimal Radio Window for the Detection of Ultra-High-Energy Cosmic Rays and Neutrinos off the Moon
Authors: O. Scholten, J. Bacelar, R. Braun, A.G. de Bruyn, H. Falcke, B. Stappers, R.G. Strom
Comments: Submitted to Astroparticle Physics
Note: replaced with revised version Mon, 3 Jul 2006 12:39:37 GMT (86kb)
astro-ph/0510349 [abs, ps, pdf, other] :: Title: Non-Gaussianity detections in the Bianchi VIIh corrected WMAP 1-year data made with directional spherical wavelets
Authors: J. D. McEwen, M. P. Hobson, A. N. Lasenby, D. J. Mortlock
Comments: 11 pages, 8 figures, replaced to match version accepted by MNRAS
Journal-ref: Mon.Not.Roy.Astron.Soc. 369 (2006) 1858-1868
Note: replaced with revised version Sun, 2 Jul 2006 23:46:44 GMT (885kb)
astro-ph/0601145 [abs, ps, pdf, other] :: Title: Novel Methods for Predicting Photometric Redshifts from Broad Band Photometry using Virtual Sensors
Authors: M.J. Way, A.N. Srivastava (NASA/Ames Research Center)
Comments: 32 pages, 26 figures, ApJ in Press, modified to reflect published version
Note: replaced with revised version Sat, 1 Jul 2006 04:37:26 GMT (255kb)
astro-ph/0601171 [abs, ps, pdf, other] :: Title: Is space really expanding? A counterexample
Authors: Michal Chodorowski (Copernicus Center)
Comments: 12 pages, no figures; added Appendix with a calculation of the cosmological redshift in `private space'
Note: replaced with revised version Mon, 3 Jul 2006 10:45:37 GMT (12kb)
astro-ph/0603427 [abs, ps, pdf, other] :: Title: The upstream magnetic field of GRB shocks
Authors: Zhuo Li, Eli Waxman (Weizmann Inst.)
Comments: Minor revisions, accepted to ApJ
Note: replaced with revised version Sun, 2 Jul 2006 07:38:11 GMT (12kb)
astro-ph/0604158 [abs, ps, pdf, other] :: Title: XRF 050406 late time flattening: appearance of an IC component?
Authors: A. Corsi, L. Piro
Comments: 8 pages, 7 figures, 1 table, submitted to A&A Main Journal. Figures 2, 5, 6 added; discussion in section 3.2 expanded; conclusions unchanged
Note: replaced with revised version Mon, 3 Jul 2006 14:22:33 GMT (162kb)
astro-ph/0604356 [abs, ps, pdf, other] :: Title: Scalar quantities as detectors of non-Gaussianity on CMB maps
Authors: C. Monteserin, R.B. Barreiro, E. Martinez-Gonzalez, J.L. Sanz
Comments: Accepted for publication in MNRAS. 13 pages, 3 figures
Note: replaced with revised version Mon, 3 Jul 2006 15:39:09 GMT (33kb)
astro-ph/0605619 [abs, ps, pdf, other] :: Title: Merging of a massive binary due to ejection of bound stars
Authors: Christian Zier
Comments: 6 pages, 2 figures, minor corrections, references added. Accepted by MNRAS Letters
Note: replaced with revised version Sun, 2 Jul 2006 11:53:09 GMT (23kb)
astro-ph/0606341 [abs, ps, pdf, other] :: Title: Remarks on statistical errors in equivalent widths
Authors: Klaus Vollmann, Thomas Eversberg
Comments: 4 pages, 1 figure, accepted by Astronomical Notes
Journal-ref: Astron.Nachr. 88 (2006) 789-792
Note: replaced with revised version Mon, 3 Jul 2006 12:06:25 GMT (60kb)
gr-qc/0511131 [abs, ps, pdf, other] :: Title: Rotating "Black Holes" with Holes in the Horizon
Authors: Alexander Burinskii, Emilio Elizalde, Sergi R. Hildebrandt, Giulio Magli
Comments: Revtex, 6 pages, 3 figures. Corrected version. To appear in Phys Rev D, Rapid Communications
Note: replaced with revised version Mon, 3 Jul 2006 14:05:03 GMT (20kb)
gr-qc/0605144 [abs, ps, pdf, other] :: Title: On the possibility of measuring the PPN parameters beta and gamma in the Earth's gravitational field to a 10^-5-10^-6 accuracy
Authors: Lorenzo Iorio
Comments: LaTex2e, 19 pages, no figures, 3 tables. Improved version with more detailed analysis of the impact of the tides, the inclination and measurement errors
Note: replaced with revised version Sun, 2 Jul 2006 14:51:47 GMT (17kb)
hep-ph/0605091 [abs, ps, pdf, other] :: Title: Moduli/Inflaton Mixing with Supersymmetry Breaking Field
Authors: Motoi Endo, Koichi Hamaguchi, Fuminobu Takahashi
Comments: 29 pages, no figure. v2: with several corrections, to appear in PRD
Note: replaced with revised version Mon, 3 Jul 2006 16:12:25 GMT (24kb)
nucl-th/0605070 [abs, ps, pdf, other] :: Title: A New Family of Simple Solutions of Perfect Fluid Hydrodynamics
Authors: T. Csorgo, M. I. Nagy, M. Csanad
Comments: 10 pages, 4 figures, dedicated to Y. Hama on the occasion of his 70th birthday, includes minor revisions and clarifications
Subj-class: Nuclear Theory; Fluid Dynamics
Note: replaced with revised version Sun, 2 Jul 2006 15:43:38 GMT (25kb)

For subscribe options to combined physics archives,
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E-mail submissions have been discontinued in favor of better support for
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gr-qc/0607007 [abs, ps, pdf, other] :: Title: "Kludge" gravitational waveforms for a test-body orbiting a Kerr black hole
Authors: Stanislav Babak, Hua Fang, Jonathan R. Gair, Kostas Glampedakis, Scott A. Hughes
Comments: 29 pages, 11 figures, requires subeqnarray

One of the most exciting potential sources of gravitational waves for low-frequency, space-based gravitational wave (GW) detectors such as the proposed Laser Interferometer Space Antenna (LISA) is the inspiral of compact objects into massive black holes in the centers of galaxies. The detection of waves from such "extreme mass ratio inspiral" systems (EMRIs) and extraction of information from those waves require template waveforms. The systems' extreme mass ratio means that their waveforms can be determined accurately using black hole perturbation theory. Such calculations are computationally very expensive. There is a pressing need for families of approximate waveforms that may be generated cheaply and quickly but which still capture the main features of true waveforms. In this paper, we introduce a family of such "kludge" waveforms and describe ways to generate them. We assess performance of the introduced approximations by comparing "kludge" waveforms to accurate waveforms obtained by solving the Teukolsky equation in the adiabatic limit (neglecting GW backreaction). We find that the kludge waveforms do extremely well at approximating the true gravitational waveform, having overlaps with the Teukolsky waveforms of 95% or higher over most of the parameter space for which comparisons can currently be made. Indeed, we find these kludges to be of such high quality (despite their ease of calculation) that it is possible they may play some role in the final search of LISA data for EMRIs.
hep-th/0607001 [abs, ps, pdf, other] :: Title: Power Spectrum and Signatures for Cascade Inflation
Authors: Amjad Ashoorioon, Axel Krause
Comments: 14

The power spectrum of M-theory cascade inflation is derived. It possesses three distinctive signatures: a decisive power suppression at small scales, oscillations around the scales that cross the horizon when the inflaton potential jumps and stepwise decrease in the scalar spectral index. All three properties result from features in the inflaton potential. Cascade inflation realizes assisted inflation in heterotic M-theory and is driven by non-perturbative interactions of N M5-branes. The features in the inflaton potential are generated whenever two M5-branes collide with the boundaries. The derived small-scale power suppression serves as a possible explanation for the dearth of observed dwarf galaxies in the Milky Way halo. The oscillations, furthermore, allow to directly probe M-theory by measurements of the spectral index and to distinguish cascade inflation observationally from other string inflation models.
hep-th/0607006 [abs, ps, pdf, other] :: Title: The issue of Dark Energy in String Theory
Authors: Nick E. Mavromatos (King's Coll. London)
Comments: Based on Invited lecture at the ``Third Aegean Summer School on: The Invisible Universe: Dark matter and Dark energy'', Karfas, Chios Island (Greece) September 26-October 1 2005

Recent astrophysical observations, pertaining to either high-redshift supernovae or cosmic microwave background temperature fluctuations, as those measured recently by the WMAP satellite, provide us with data of unprecedented accuracy, pointing towards two (related) facts: (i) our Universe is accelerated at present, and (ii) more than 70 % of its energy content consists of an unknown substance, termed dark energy, which is believed responsible for its current acceleration. Both of these facts are a challenge to String theory. In this review I outline briefly the challenges, the problems and possible avenues for research towards a resolution of the Dark Energy issue in string theory.

Replacements

astro-ph/0003237 [abs, ps, pdf, other] :: Title: Erratum: ASCA Observations of the Absorption-Line Features from the Super-Luminal Jet Source GRS 1915+105
Authors: Taro Kotani, Ken Ebisawa, Tadayasu Dotani, Hajime Inoue, Fumiaki Nagase, Yasuo Tanaka, Yoshihiro Ueda
Comments: Erratum with 1 table and 1 figure submitted to ApJ. Original paper included
Journal-ref: ApJ, 539, 413 (2000)
Note: replaced with revised version Tue, 4 Jul 2006 07:02:50 GMT (79kb)
astro-ph/0504519 [abs, ps, pdf, other] :: Title: Cluster number counts dependence on dark energy inhomogeneities and coupling to dark matter
Authors: M. Manera, D. F. Mota
Comments: 9 pages, 8 figures. Further extensions on section on discriminating models with future surveys. Accepted for publication in Mon. Not. Roy. Astro. Soc
Note: replaced with revised version Tue, 4 Jul 2006 17:35:34 GMT (244kb)
astro-ph/0507021 [abs, ps, pdf, other] :: Title: Fast multilevel radiative transfer
Authors: F. Paletou, L. Leger (Universite Paul Sabatier, Toulouse 3, OMP/LATT)
Comments: 16 pages, 4 figs (1 changed), 2 tables (1 added): to appear in the JQSRT
Note: replaced with revised version Tue, 4 Jul 2006 11:46:14 GMT (74kb)
astro-ph/0510446 [abs, ps, pdf, other] :: Title: Active Cores in Deep Fields
Authors: G. Hasinger (MPE), A. Mueller (MPE)
Comments: 8 pages, 3 figures. published in proceedings of IAUS230: "Populations of High Energy Sources in Galaxies", August 15-19 2005, Dublin, Eds E.J.A. Meurs and G. Fabbiano
Journal-ref: Proceedings IAU Symposium No. 230, 2005, Eds E.J.A. Meurs and G. Fabbiano
Note: replaced with revised version Tue, 4 Jul 2006 12:39:19 GMT (336kb)
astro-ph/0511708 [abs, ps, pdf, other] :: Title: Radiative zone solar magnetic fields and g-modes
Authors: T. I. Rashba, V. B. Semikoz, J. W. F. Valle
Comments: 6 pages, 4 figures; final version to appear in MNRAS
Note: replaced with revised version Tue, 4 Jul 2006 12:42:31 GMT (69kb)
astro-ph/0604227 [abs, ps, pdf, other] :: Title: Colour Dependence of the Distribution of IRAS Galaxies revealed by Multifractal Measures
Authors: Jun Pan (Nottingham, UK; PMO, China)
Comments: minor revision; accepted by A&A
Note: replaced with revised version Tue, 4 Jul 2006 01:36:41 GMT (45kb)
astro-ph/0604486 [abs, ps, pdf, other] :: Title: Ion dynamics and the magnetorotational instability in weakly-ionized discs
Authors: B.P.Pandey, Mark Wardle
Comments: 13 pages, 12 figures
Note: replaced with revised version Mon, 3 Jul 2006 23:44:39 GMT (60kb)
astro-ph/0604609 [abs, pdf] :: Title: Solar ions in the heliosheath: a possible new source of heavy neutral atoms
Authors: S. Grzedzielski, M. Wachowicz, M. Bzowski, V. Izmodenov
Comments: Submitted for IGGP Astrophysics Conference, March 2006; 6 pages
Note: replaced with revised version Tue, 4 Jul 2006 10:24:45 GMT (243kb)
astro-ph/0604611 [abs, ps, pdf, other] :: Title: Non-gaussianity for a Two Component Hybrid Model of Inflation
Authors: Laila Alabidi
Comments: 10 pages and 5 figures. More extensive analysis of model, which shows that observable fnl is possible
Note: replaced with revised version Tue, 4 Jul 2006 15:26:23 GMT (58kb)
astro-ph/0605407 [abs, ps, pdf, other] :: Title: An Optically Dark GRB Observed by HETE-2: GRB 051022
Authors: Yujin E. Nakagawa, Atsumasa Yoshida, Satoshi Sugita, Kaoru Tanaka, Nobuyuki Ishikawa, Toru Tamagawa, Motoko Suzuki, Yuji Shirasaki, Nobuyuki Kawai, Masaru Matsuoka, Jean-Luc Atteia, Alexandre Pelangeon, Roland Vanderspek, Geoff B. Crew, Joel S. Villasenor, Nat Butler, John Doty, George R. Ricker, Graziella Pizzichini, Timothy Q. Donaghy, Donald Q. Lamb, Carlo Graziani, Rie Sato, Makoto Arimoto, Jun'ichi Kotoku, J. Garret Jernigan, Takanori Sakamoto, Jean-Francois Olive, Michel Boer, Edward E. Fenimore, Mark Galassi, Stanford E. Woosley, Makoto Yamauchi, Kunio Takagishi, Isamu Hatsukade
Comments: 6 pages, 2 figures, accepted for publication in PASJ letter
Note: replaced with revised version Tue, 4 Jul 2006 12:42:16 GMT (624kb)
astro-ph/0605607 [abs, ps, pdf, other] :: Title: Supernova constraints on decaying vacuum cosmology
Authors: S. Carneiro, C. Pigozzo, H. A. Borges, J. S. Alcaniz
Comments: Version accepted for publication in Physical Review D
Note: replaced with revised version Tue, 4 Jul 2006 16:13:13 GMT (82kb)
astro-ph/0606633 [abs, ps, pdf, other] :: Title: A Curious New Milky Way Satellite in Ursa Major
Authors: D.B. Zucker (1), V. Belokurov (1), N.W. Evans (1), J.T. Kleyna (2), M.J. Irwin (1), M.I. Wilkinson (1), M. Fellhauer (1), D.M. Bramich (1), G. Gilmore (1), H.J. Newberg (3), B. Yanny (4), J.A. Smith (5,6), P.C. Hewett (1), E.F. Bell (7), H.-W. Rix (7), O.Y. Gnedin (8), S. Vidrih (1), R.F.G. Wyse (9), B. Willman (10), E.K. Grebel (11), D.P. Schneider (12), T.C. Beers (13), A.Y. Kniazev (7,14), J.C. Barentine (15), H. Brewington (15), J. Brinkmann (15), M. Harvanek (15), S.J. Kleinman (16), J. Krzesinski (15,17) D. Long (15), A. Nitta (18), S.A. Snedden (15) ((1) Cambridge, (2) Hawaii, (3) RPI, (4) FNAL, (5) LANL, (6) Austin Peay State University, (7) MPIA, (8) OSU, (9) JHU, (10) NYU, (11) Basel, (12) Penn State University, (13) Michigan State University, (14) SAAO, (15) Apache Point, (16) Subaru Telescope, (17) Cracow, (18) Gemini Observatory)
Comments: 4 pages, 4 figures, submitted to ApJ Letters
Note: replaced with revised version Tue, 4 Jul 2006 17:43:07 GMT (275kb)
hep-ph/0509163 [abs, ps, pdf, other] :: Title: Confronting mass-varying neutrinos with MiniBooNE
Authors: V. Barger, D. Marfatia, K. Whisnant
Comments: 22 pages, 3 figures, 1 table. Comment added about recent MINOS data
Journal-ref: Phys.Rev. D73 (2006) 013005
Note: replaced with revised version Mon, 3 Jul 2006 22:42:21 GMT (34kb)
hep-ph/0601147 [abs, ps, pdf, other] :: Title: Cosmological implication of antisymmetric tensor field on D-brane
Authors: Inyong Cho, Eung Jin Chun, Hang Bae Kim, Yoonbai Kim
Comments: 16 pages, 4 figures. To appear in the proceedings of the 9th Italian-Korean Symposium on Relativistic Astrophysics, Seoul, South Korea, and Mt. Kumgang, North Korea, 19-24 Jul. 2005. Submitted to J. Korean Phys. Soc. Minor corrections have been made. References have been added
Note: replaced with revised version Tue, 4 Jul 2006 12:05:24 GMT (146kb)
cond-mat/0602452 [abs, ps, pdf, other] :: Title: Universal optimal hole-doping concentration in single-layer high-temperature cuprate superconductors
Authors: T. Honma, P. H. Hor
Comments: 8 pages, 4 figures; added references ;accepted for the publication in Supercond. Sci. Technol
Subj-class: Superconductivity; Strongly Correlated Electrons
Note: replaced with revised version Tue, 4 Jul 2006 04:58:18 GMT (236kb)

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cond-mat/0607057 [abs, ps, pdf, other] :: Title: New critical behavior in unconventional ferromagnetic superconductors
Authors: Dimo I. Uzunov
Comments: 4 pages, 3 figures
Subj-class: Superconductivity; Strongly Correlated Electrons; Statistical Mechanics; Chemical Physics

A new critical behavior in unconventional superconductors and superfluids is established and described by the Wilson-Fisher renormalization-group method. For certain symmetries of order a new type of fluctuation-driven first order phase transitions at finite and zero temperature are predicted. The results can be applied to a wide class of ferromagnetic superconductive and superfluid systems, in particular, to itinerant ferromagnets as UGe_2 and URhGe.
hep-th/0606223 [abs, ps, pdf, other] :: Title: Trapped Quintessential Inflation in the context of Flux Compactifications
Authors: J.C. Bueno Sanchez, K. Dimopoulos
Comments: 35 pages, 4 figures, revtex

We present a model for quintessential inflation using a string modulus for the inflaton - quintessence field. The scalar potential of our model is based on generic non-perturbative potentials arising in flux compactifications. We assume an enhanced symmetry point (ESP), which fixes the initial conditions for slow-roll inflation. When crossing the ESP the modulus becomes temporarily trapped, which leads to a brief stage of trapped inflation. This is followed by enough slow roll inflation to solve the flatness and horizon problems. After inflation, the field rolls down the potential and eventually freezes to a certain value because of cosmological friction. The latter is due to the thermal bath of the hot big bang, which is produced by the decay of a curvaton field. The modulus remains frozen until the present, when it becomes quintessence.
physics/0607027 [abs, ps, pdf, other] :: Title: The EEE Project
Authors: R. Antolini, R. Baldini Ferroli, M. Caporaloni, A. Chiavassa, L. Cifarelli, F. Cindolo, E. Coccia, S. De Pasquale, M. Garbini, C. Gustavino, D. Hatzifotiadou, G. Imponente, H. Menghetti, G. Piragino, G. Sartorelli, M. Selvi, C. Williams, A. Zichichi
Comments: 4 pages, 29th ICRC 2005, Pune, India
Subj-class: Instrumentation and Detectors
Journal-ref: 29th International Cosmic Ray Conference Pune (2005) 8, 279-282

The new experiment ``Extreme Energy Events'' (EEE) to detect extensive air showers through muon detection is starting in Italy. The use of particle detectors based on Multigap Resistive Plate Chambers (MRPC) will allow to determine with a very high accuracy the direction of the axis of cosmic ray showers initiated by primaries of ultra-high energy, together with a high temporal resolution. The installation of many of such 'telescopes' in numerous High Schools scattered all over the Italian territory will also allow to investigate coincidences between multiple primaries producing distant showers. Here we present the experimental apparatus and its tasks.

Replacements

astro-ph/0509881 [abs, ps, pdf, other] :: Title: AGB stars in the Magellanic Clouds. II. The rate of star formation across the LMC
Authors: M.-R.L. Cioni, L. Girardi, P. Marigo, H.J. Habing
Comments: 17 pages, 13 figures. Note: replaced with published version. A separate Erratum contains the correct Fig. 14
Journal-ref: A&A 448. 77-91 (2006)
Note: replaced with revised version Wed, 5 Jul 2006 09:51:53 GMT (820kb)
astro-ph/0603354 [abs, ps, pdf, other] :: Title: High-resolution mapping of interstellar clouds with near-infrared scattered light
Authors: M. Juvela (1), V.-M. Pelkonen (1), P. Padoan (2), K. Mattila (1) ((1) Helsinki University Observatory, (2) CASS/UCSD)
Comments: 20 pages, accepted to A&A; this version contains some structural changes and two new figures
Note: replaced with revised version Wed, 5 Jul 2006 15:33:15 GMT (822kb)
astro-ph/0606598 [abs, ps, pdf, other] :: Title: Radio Spectrum and Distance of the SNR HB9
Authors: D.A. Leahy, W.W. Tian
Comments: 7 pages, 5 figures, 1 table, submitted to A&A
Note: replaced with revised version Tue, 4 Jul 2006 22:09:28 GMT (942kb)
astro-ph/0606613 [abs, ps, pdf, other] :: Title: Structure of pair winds from compact objects with application to emission from bare strange stars
Authors: A.G. Aksenov, M. Milgrom, V.V. Usov
Comments: 4 pages, 6 figures, 1 table, added references, to appear in the proceedings of the conference "Isolated Neutron Stars: from the Surface to the Interior", London, UK, 24-28 April 2006
Note: replaced with revised version Wed, 5 Jul 2006 12:46:47 GMT (103kb)
astro-ph/0606703 [abs, ps, pdf, other] :: Title: Nonlinear Structure Formation and "Apparent" Acceleration: an Investigation
Authors: Tirthabir Biswas (McGill U.), Reza Mansouri (Sharif U.), Alessio Notari (McGill U.)
Comments: 57 pages, 13 figures. Formatting errors fixed
Note: replaced with revised version Wed, 5 Jul 2006 16:58:21 GMT (539kb)
hep-ph/0604063 [abs, ps, pdf, other] :: Title: Leptogenesis in a model of Dark Energy and Dark Matter
Authors: P. Q. Hung
Comments: 10 double-column pages, 3 figures. Updated reference
Note: replaced with revised version Wed, 5 Jul 2006 09:58:54 GMT (43kb)

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gr-qc/0607015 [abs, ps, pdf, other] :: Title: Detecting a stochastic background of gravitational waves in the presence of non-Gaussian noise: A performance of generalized cross-correlation statistic
Authors: Yoshiaki Himemoto, Atsushi Taruya, Hideaki Kudoh, Takashi Hiramatsu
Comments: 15 pages, 8 figures

We discuss the robust data analysis method to detect a stochastic background of gravitational waves in the presence of non-Gaussian noise. Fundamental methodology to detect weak stochastic signals is to use the cross-correlation statistic which combines the outputs of two gravitational detectors. Usually, the so-called standard cross-correlation (SCC) statistic is used for the data analysis of gravitational-wave background search, which is optimal only if the detector noise obeys a stationary Gaussian process. Here, we consider a {\it generalized cross-correlation} (GCC) statistic, which is nearly optimal even in the presence of non-Gaussian noise. The detection efficiency and the general tendency of the GCC statistic are investigated analytically, particularly focusing on the statistical quantities of the false-alarm and the false-dismissal probabilities and the minimum detectable amplitude of gravitational-wave signals. We find that the GCC statistics is robust against the non-Gaussian tail of detector noises. The detection efficiency of the GCC statistic roughly corresponds to the one of the SCC statistics neglecting the contribution of non-Gaussian tails. These remarkable properties are also checked and confirmed by performing the Monte Carlo simulations.
hep-ph/0601016 [abs, ps, pdf, other] :: Title: Particle Physics Approach to Dark Matter
Authors: George Lazarides (Aristotle U., Thessaloniki)
Comments: 32 pages including 6 figures, uses svmult.cls, some clarifications added, lectures given at the Third Aegean Summer School "The Invisible Universe: Dark Matter and Dark Energy", 26 September-1 October 2005, Karfas, Island of Chios, Greece (to appear in the proceedings)

We review the main proposals of particle physics for the composition of the cold dark matter in the universe. Strong axion contribution to cold dark matter is not favored if the Peccei-Quinn field emerges with non-zero value at the end of inflation and the inflationary scale is superheavy since, under these circumstances, it leads to unacceptably large isocurvature perturbations. The lightest neutralino is the most popular candidate constituent of cold dark matter. Its relic abundance in the constrained minimal supersymmetric standard model can be reduced to acceptable values by pole annihilation of neutralinos or neutralino-stau coannihilation. Axinos can also contribute to cold dark matter provided that the reheat temperature is adequately low. Gravitinos can constitute the cold dark matter only in limited regions of the parameter space. We present a supersymmetric grand unified model leading to violation of Yukawa unification and, thus, allowing an acceptable b-quark mass within the constrained minimal supersymmetric standard model with mu>0. The model possesses a wide range of parameters consistent with the data on the cold dark matter abundance as well as other phenomenological constraints. Also, it leads to a new version of shifted hybrid inflation.
hep-ph/0606311 [abs, ps, pdf, other] :: Title: Ultra high energy neutrino-nucleon cross section from cosmic ray experiments and neutrino telescopes
Authors: V. Barger, Patrick Huber, Danny Marfatia
Comments: 20 pages, 6 figures, 2 tables

We deduce the cosmogenic neutrino flux by jointly analysing ultra high energy cosmic ray data from HiRes-I and II, AGASA and the Pierre Auger Observatory. We make two determinations of the neutrino flux by using a model-dependent method and a model-independent method. The former is well-known, and involves the use of a power-law injection spectrum. The latter is a regularized unfolding procedure. We then use neutrino flux bounds obtained by the RICE experiment to constrain the neutrino-nucleon inelastic cross section at energies inaccessible at colliders. The cross section bounds obtained using the cosmogenic fluxes derived by unfolding are the most model-independent bounds to date.
hep-ph/0607032 [abs, ps, pdf, other] :: Title: Basics of inflationary cosmology
Authors: George Lazarides (Aristotle U., Thessaloniki)
Comments: 23 pages, uses jpconf.cls, lecture given at Corfu Summer Institute on Elementary Particle Physics (CORFU2005), Corfu, Greece, 4-26 September 2005 (to appear in the proceedings)

The early stages of the universe evolution are discussed according to the hot big bang model and the grand unified theories. The shortcomings of big bang are summarized and their resolution by inflationary cosmology is sketched. Cosmological inflation, the subsequent oscillation and decay of the inflaton field, and the resulting reheating of the universe are studied in some detail. The density perturbations produced by inflation and the temperature fluctuations of the cosmic microwave background radiation are introduced. The hybrid inflationary model is described. Two natural variants of the supersymmetric version of this model which avoid the disaster encountered in its standard realization from the overproduction of magnetic monopoles are presented.

Replacements

astro-ph/0601145 [abs, ps, pdf, other] :: Title: Novel Methods for Predicting Photometric Redshifts from Broad Band Photometry using Virtual Sensors
Authors: M.J. Way, A.N. Srivastava (NASA/Ames Research Center)
Comments: 36 pages, 12 figures, ApJ in Press, modified to reflect published version and color figures
Note: replaced with revised version Thu, 6 Jul 2006 00:41:49 GMT (138kb)
astro-ph/0602549 [abs, ps, pdf, other] :: Title: The relation between accretion rate and jet power in X-ray luminous elliptical galaxies
Authors: S.W. Allen (KIPAC, Stanford), R.J.H. Dunn, A.C. Fabian (IoA, Cambridge), G.B. Taylor (UNM), C.S. Reynolds (UMD)
Comments: Accepted for publication in MNRAS. 10 pages, 4 figures. Includes an enhanced statistical analysis and some additional data. Conclusions unchanged
Note: replaced with revised version Thu, 6 Jul 2006 19:29:01 GMT (564kb)
astro-ph/0604198 [abs, ps, pdf, other] :: Title: Barium even-to-odd isotope abundance ratios in thick disk and thin disk stars
Authors: L. Mashonkina, G. Zhao
Comments: 10 pages, 7 figures, accepted for publication in Astronomy and Astrophysics
Note: replaced with revised version Thu, 6 Jul 2006 12:27:44 GMT (47kb)
astro-ph/0604292 [abs, ps, pdf, other] :: Title: Quantum noise and a low cosmic microwave background quadrupole
Authors: Chun-Hsien Wu, Kin-Wang Ng, Wolung Lee, Da-Shin Lee, Yeo-Yie Charng
Comments: 4 pages, revised Fig.2, augmented with inflaton quantum fluctuations and new discussions
Note: replaced with revised version Thu, 6 Jul 2006 13:35:34 GMT (39kb)
astro-ph/0604472 [abs, ps, pdf, other] :: Title: Exploring the spectroscopic diversity of Type Ia Supernovae
Authors: S. Hachinger, P. A. Mazzali, S. Benetti
Comments: 24 pages, 22 figures, updated (typo and style corrections). MNRAS, in press
Note: replaced with revised version Thu, 6 Jul 2006 12:58:58 GMT (205kb)
astro-ph/0605396 [abs, ps, pdf, other] :: Title: Detection of a 60 Degree-Long Dwarf Galaxy Debris Stream
Authors: C. J. Grillmair
Comments: Modified to conform to published version
Note: replaced with revised version Thu, 6 Jul 2006 17:05:45 GMT (628kb)
astro-ph/0605604 [abs, ps, pdf, other] :: Title: Nflation: multi-field inflationary dynamics and perturbations
Authors: Soo A Kim, Andrew R Liddle
Comments: 6 pages RevTeX4, 4 figures included. Updated to match PRD accepted version. Analysis and conclusions unchanged. New references, especially astro-ph/0510441 which was first to give the general r=8/N result
Note: replaced with revised version Thu, 6 Jul 2006 09:57:11 GMT (36kb)
astro-ph/0606265 [abs, ps, pdf, other] :: Title: The mean electro-motive force, current- and cross-helicity under the influence of rotation, magnetic field and shear
Authors: V.V.Pipin
Comments: 26 pages, 8 figures, submitted to GAFD
Note: replaced with revised version Thu, 6 Jul 2006 06:39:26 GMT (64kb)
astro-ph/0606642 [abs, ps, pdf, other] :: Title: Line Strengths in Early-Type Cluster Galaxies at z=0.33: Implications for alpha/Fe, Nitrogen and the Histories of E/S0s
Authors: Daniel D. Kelson (1), Garth D. Illingworth (2), Marijn Franx (3), P.G. van Dokkum (4) ((1) Carnegie Observatories, (2) UCO/Lick Observatory, (3) Leiden Observatory, (4) Yale University)
Comments: Accepted for publication in ApJ. 15 figures. (the new version has had some very minor changes, and some more typographical errors fixed)
Note: replaced with revised version Wed, 5 Jul 2006 20:09:58 GMT (371kb)
astro-ph/0607057 [abs, ps, pdf, other] :: Title: Evidences on secular dynamical evolution of detached active binary orbits and contact binary formation
Authors: Z. Eker, O. Demircan, S. Bilir, Y. Karatas
Comments: 14 pages, 7 figures and 1 table, to appear in the proceedings of the conference, Invited talk, "Solar and Stellar Physics Through Eclipses", 27-29 March 2006, Side, Antalya-Turkey. Three figures were changed
Note: replaced with revised version Thu, 6 Jul 2006 07:01:01 GMT (515kb)
gr-qc/0512085 [abs, ps, pdf, other] :: Title: Tilt and phantom cosmology
Authors: A.A. Coley, S. Hervik, W.C. Lim
Comments: 9 pages, v2: more discussion, added references
Journal-ref: Phys.Lett. B638 (2006) 310-313
Note: replaced with revised version Thu, 6 Jul 2006 15:45:58 GMT (9kb)

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