2007

Physical Review Letters

Constraints on Braneworld Gravity Models from a Kinematic Limit on the
Age of the Black Hole XTE J1118+480
Dimitrios Psaltis
Published 2 May 2007
181101   Abstract    Full Text: [ PDF (138 kB)  GZipped PS   ]    Order

Cosmological Neutrino Mass Detection: The Best Probe of Neutrino Lifetime
Pasquale
D. Serpico
Published 23 April 2007
171301   Abstract    Full Text: [ PDF (124 kB)  GZipped PS   ]    Order

A New Force in the Dark Sector?
Glennys R. Farrar and Rachel A. Rosen
Published 24 April 2007
171302   Abstract    Full Text: [ PDF (92 kB)  GZipped PS   ]    Order

Unified TeV Scale Picture of Baryogenesis and Dark Matter
K. S. Babu, R. N. Mohapatra, and Salah Nasri
Published 16 April 2007
161301   Abstract    Full Text: [ PDF (101 kB)  GZipped PS   ]    Order

Complex Hybrid Inflation and Baryogenesis
David Delepine, Carlos Martínez, and L. Arturo Ureña-López <<<<<<<<<<<<IAC>
Published 17 April 2007
161302   Abstract    Full Text: [ PDF (106 kB)  GZipped PS   ]    Order

Cancellations Beyond Finiteness in [IMAGE]=8 Supergravity at Three Loops
Z. Bern, J. J. Carrasco, L. J. Dixon, H. Johansson, D. A. Kosower, and R.
Roiban
Published 19 April 2007
161303   Abstract    Full Text: [ PDF (201 kB)  GZipped PS   ]    Order

Axino Dark Matter from Q-Balls in Affleck-Dine Baryogenesis and
the [IMAGE]b-[IMAGE]DM Coincidence Problem
Leszek Roszkowski and Osamu Seto
Published 19 April 2007
161304   Abstract    Full Text: [ PDF (115 kB)  GZipped PS   ]    Order

Physical Review Letters (Junio)

Tensor Modes from a Primordial Hagedorn Phase of String Cosmology
Robert H. Brandenberger, Ali Nayeri, Subodh P. Patil, and Cumrun Vafa
Published 7 June 2007
231302   Abstract    Full Text: [ PDF (99 kB)  GZipped PS   ]   
Order

Measuring Deviations from a Cosmological Constant: A Field-Space
Parametrization
Robert Crittenden, Elisabetta Majerotto, and Federico Piazza
Published 21 June 2007
251301   Abstract    Full Text: [ PDF (239 kB)  GZipped PS   ]   
Order

Physical Review Letters -- (September)

Nonlocal Cosmology
S. Deser and R. P. Woodard
Volume 99, Issue 11 , Articles 
Published 14 September 2007
111301   Abstract    Full Text: [ PDF (87 kB)  GZipped PS   ]   
Order

Volume 99, Issue 12 ,
Compatibility of the Chameleon-Field Model with Fifth-Force
Experiments, Cosmology, and PVLAS and CAST Results
Philippe Brax, Carsten van de Bruck, and Anne-Christine Davis
Published 21 September 2007
121103   Abstract    Full Text: [ PDF (98 kB)  GZipped PS   ]   
Order

Decaying Warm Dark Matter and Neutrino Masses
M. Lattanzi and J. W. F. Valle
Published 20 September 2007
121301   Abstract    Full Text: [ PDF (292 kB)  GZipped PS   ]   
Order

Physical Review Letters -- October 5, 2007

Volume 99, Issue 14 , 
Constraining Unparticle Physics with Cosmology and Astrophysics
Hooman Davoudiasl
Published 1 October 2007
141301   Abstract    Full Text: [ PDF (134 kB)  GZipped PS   ]   
Order

Probing Gravity at Cosmological Scales by Measurements which Test the
Relationship between Gravitational Lensing and Matter Overdensity
Pengjie Zhang, Michele Liguori, Rachel Bean, and Scott Dodelson
Published 4 October 2007
141302   Abstract    Full Text: [ PDF (176 kB)  GZipped PS   ]   
Order

Elementary Particles and Fields 
[ Previous / Next Subject | Issue Index | Top / Bottom of Page]

A Delicate Universe: Compactification Obstacles to D-brane Inflation
Daniel Baumann, Anatoly Dymarsky, Igor R. Klebanov, Liam McAllister,
and Paul J. Steinhardt
Published 1 October 2007
141601   Abstract    Full Text: [ PDF (139 kB)  GZipped PS   ]   
Order

Abril 2007

Unified TeV Scale Picture of Baryogenesis and Dark Matter
K. S. Babu, R. N. Mohapatra, and Salah Nasri
Published 16 April 2007
161301   Abstract    Full Text: [ PDF (101 kB)  GZipped PS   ]   
Order
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Complex Hybrid Inflation and Baryogenesis
David Delepine, Carlos Martínez, and L. Arturo Ureña-López <<<<<<<<<<<<< IAC
Published 17 April 2007
161302   Abstract    Full Text: [ PDF (106 kB)  GZipped PS   ]   
Order

[IMAGE]Cancellations Beyond Finiteness in [IMAGE]=8 Supergravity at
Three Loops Z. Bern, J. J. Carrasco, L. J. Dixon, H. Johansson, D. A.
Kosower, and R. Roiban
Published 19 April 2007
161303   Abstract    Full Text: [ PDF (201 kB)  GZipped PS   ]   
Order
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Axino Dark Matter from Q-Balls in Affleck-Dine Baryogenesis and
the [IMAGE]b-[IMAGE]DM Coincidence Problem
Leszek Roszkowski and Osamu Seto
Published 19 April 2007
161304   Abstract    Full Text: [ PDF (115 kB)  GZipped PS   ]   
Order

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Cosmological Neutrino Mass Detection: The Best Probe of Neutrino
Lifetime
Pasquale D. Serpico
Published 23 April 2007
171301   Abstract    Full Text: [ PDF (124 kB)  GZipped PS   ]   
Order
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A New Force in the Dark Sector?
Glennys R. Farrar and Rachel A. Rosen
Published 24 April 2007
171302   Abstract    Full Text: [ PDF (92 kB)  GZipped PS   ]   

Order
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Mayo 2007

Constraints on Braneworld Gravity Models from a Kinematic Limit on
the Age of the Black Hole XTE J1118+480
Dimitrios Psaltis
Published 2 May 2007
181101   Abstract    Full Text: [ PDF (138 kB)  GZipped PS   ]   
Order
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Black Hole Entropy Quantization
Alejandro Corichi, Jacobo Díaz-Polo, and Enrique Fernández-Borja
Published 4 May 2007
181301   Abstract    Full Text: [ PDF (754 kB)  GZipped PS   ]   
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Null Test of Newtonian Inverse-Square Law at Submillimeter Range with
a Dual-Modulation Torsion Pendulum
Liang-Cheng Tu, Sheng-Guo Guan, Jun Luo, Cheng-Gang Shao, and Lin-Xia
Liu
Published 14 May 2007
201101   Abstract    Full Text: [ PDF (535 kB)  GZipped PS   ]   
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Choreographic Solution to the General-Relativistic Three-Body Problem
Tatsunori Imai, Takamasa Chiba, and Hideki Asada
Published 17 May 2007
201102   Abstract    Full Text: [ PDF (355 kB)  GZipped PS   ]   
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[IMAGE]Unparticle Physics Howard Georgi
Published 29 May 2007
221601   Abstract    Full Text: [ PDF (121 kB)  GZipped PS   ]   
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Junio 2007

Supermassive Recoil Velocities for Binary Black-Hole Mergers with
Antialigned Spins
José A. González, Mark Hannam, Ulrich Sperhake, Bernd Brügmann, and
Sascha Husa
Published 7 June 2007
231101   Abstract    Full Text: [ PDF (237 kB)  GZipped PS   ]   
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Maximum Gravitational Recoil
Manuela Campanelli, Carlos O. Lousto, Yosef Zlochower, and David
Merritt
Published 7 June 2007
231102   Abstract    Full Text: [ PDF (213 kB)  GZipped PS   ]   
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Particle Physics Catalysis of Thermal Big Bang Nucleosynthesis
Maxim Pospelov
Published 4 June 2007
231301   Abstract    Full Text: [ PDF (181 kB)  GZipped PS   ]   
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Tensor Modes from a Primordial Hagedorn Phase of String Cosmology
Robert H. Brandenberger, Ali Nayeri, Subodh P. Patil, and Cumrun Vafa
Published 7 June 2007
231302   Abstract    Full Text: [ PDF (99 kB)  GZipped PS   ]   
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Conformally Coupled Scalars, Instantons, and Vacuum Instability in 4D
Anti-de Sitter Space
Sebastian de Haro, Ioannis Papadimitriou, and Anastasios C. Petkou
Published 8 June 2007
231601   Abstract    Full Text: [ PDF (128 kB)  GZipped PS   ]   
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Generic Gravitational-Wave Signals from the Collapse of Rotating
Stellar Cores
H. Dimmelmeier, C. D. Ott, H.-T. Janka, A. Marek, and E. Müller
Published 18 June 2007
251101   Abstract    Full Text: [ PDF (258 kB)  GZipped PS   ]   
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Measuring Deviations from a Cosmological Constant: A Field-Space
Parametrization
Robert Crittenden, Elisabetta Majerotto, and Federico Piazza
Published 21 June 2007
251301   Abstract    Full Text: [ PDF (239 kB)  GZipped PS   ]   
Order

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Evolution of Magnetic Fields in Freely Decaying Magnetohydrodynamic
Turbulence
Leonardo Campanelli
Published 22 June 2007
251302   Abstract    Full Text: [ PDF (175 kB)  GZipped PS   ]   
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Hawking-Moss Bounces and Vacuum Decay Rates
Erick J. Weinberg
Published 22 June 2007
251303   Abstract    Full Text: [ PDF (125 kB)  GZipped PS   ]   
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3D Collapse of Rotating Stellar Iron Cores in General Relativity
Including Deleptonization and a Nuclear Equation of State
C. D. Ott, H. Dimmelmeier, A. Marek, H.-T. Janka, I. Hawke, B. Zink,
and E. Schnetter
Published 29 June 2007
261101   Abstract    Full Text: [ PDF (331 kB)  GZipped PS   ]   
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Spacetime Emergence of the Robertson-Walker Universe from a Matrix
Model
Johanna Erdmenger, René Meyer, and Jeong-Hyuck Park
Published 25 June 2007
261301   Abstract    Full Text: [ PDF (119 kB)  GZipped PS   ]   
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Algebraic Classification of Weyl Anomalies in Arbitrary Dimensions
Nicolas Boulanger
Published 29 June 2007
261302   Abstract    Full Text: [ PDF (108 kB)  GZipped PS   ]   
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Julio 2007

Lorentz-Violating Electrodynamics and the Cosmic Microwave Background
V. Alan Kostelecký and Matthew Mewes
Published 3 July 2007
011601   Abstract    Full Text: [ PDF (296 kB)  GZipped PS   ]   
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Black Hole Thermodynamics from Euclidean Horizon Constraints
S. Carlip
Published 10 July 2007
021301   Abstract    Full Text: [ PDF (105 kB)  GZipped PS   ]   
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Elementary Particles and Fields 
[ Previous / Next Subject | Issue Index | Top / Bottom of Page]

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Seesaw Neutrinos from the Heterotic String
Wilfried Buchmüller, Koichi Hamaguchi, Oleg Lebedev, Saúl
Ramos-Sánchez, and Michael Ratz
Published 9 July 2007
021601   Abstract    Full Text: [ PDF (135 kB)  GZipped PS   ]   
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Is There a ~SMost Perfect Fluid~T Consistent with Quantum Field
Theory?
Thomas D. Cohen
Published 9 July 2007
021602   Abstract    Full Text: [ PDF (95 kB)  GZipped PS   ]   
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Seesaw Mechanism for Scalar Fields as Possible Basis for Dark Energy
Kari Enqvist, Steen Hannestad, and Martin S. Sloth
Published 20 July 2007
031301   Abstract    Full Text: [ PDF (100 kB)  GZipped PS   ]   
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Waves in Interplanetary Shocks: A Wind/WAVES Study
L. B. Wilson III, C. Cattell, P. J. Kellogg, K. Goetz, K. Kersten, L.
Hanson, R. MacGregor, and J. C. Kasper
Published 26 July 2007
041101   Abstract    Full Text: [ PDF (499 kB)  GZipped PS   ]   
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Recoil Velocities from Equal-Mass Binary-Black-Hole Mergers
Michael Koppitz, Denis Pollney, Christian Reisswig, Luciano Rezzolla,
Jonathan Thornburg, Peter Diener, and Erik Schnetter
Published 27 July 2007
041102   Abstract    Full Text: [ PDF (220 kB)  GZipped PS   ]   
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[IMAGE]Observable Signatures of a Black Hole Ejected by
Gravitational-Radiation Recoil in a Galaxy Merger Abraham Loeb
Published 27 July 2007
041103   Abstract    Full Text: [ PDF (101 kB)  GZipped PS   ]   

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Significant Gamma Lines from Inert Higgs Dark Matter
Michael Gustafsson, Erik Lundström, Lars Bergström, and Joakim Edsjö
Published 27 July 2007
041301   Abstract    Full Text: [ PDF (222 kB)  GZipped PS   ]   
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Nondecoupling of Maximal Supergravity from the Superstring
Michael B. Green, Hirosi Ooguri, and John H. Schwarz
Published 25 July 2007
041601   Abstract    Full Text: [ PDF (90 kB)  GZipped PS   ]   
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Agosto 2007

Black Hole Constraints on Varying Fundamental Constants
Jane H. MacGibbon
Published 10 August 2007
061301   Abstract    Full Text: [ PDF (107 kB)  GZipped PS   ]   
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Why There is Something Rather than Nothing: Cosmological Constant
from Summing over Everything in Lorentzian Quantum Gravity
A. O. Barvinsky
Published 16 August 2007
071301   Abstract    Full Text: [ PDF (112 kB)  GZipped PS   ]   
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Quantum Gravity Boundary Terms from the Spectral Action of
Noncommutative Space
Ali H. Chamseddine and Alain Connes
Published 17 August 2007
071302   Abstract    Full Text: [ PDF (99 kB)  GZipped PS   ]   
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Dynamical Casimir Effect in Braneworlds
Ruth Durrer and Marcus Ruser
Published 15 August 2007
071601   Abstract    Full Text: [ PDF (106 kB)  GZipped PS   ]   
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Cosmological Constraints from Type Ia Supernovae Peculiar Velocity
Measurements
C. Gordon, K. Land, and A. Slosar
Published 20 August 2007
081301   Abstract    Full Text: [ PDF (190 kB)  GZipped PS   ]   
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Imprints of Spherical Nontrivial Topologies on the Cosmic Microwave
Background
Anastasia Niarchou and Andrew Jaffe
Published 24 August 2007
081302   Abstract    Full Text: [ PDF (499 kB)  GZipped PS   ]   
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Molecular Magnetic Dichroism in Spectra of White Dwarfs
S. V. Berdyugina, A. V. Berdyugin, and V. Piirola
Published 28 August 2007
091101   Abstract    Full Text: [ PDF (946 kB)  GZipped PS   ]   
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Limits on Interactions between Weakly Interacting Massive Particles
and Nucleons Obtained with CsI(Tl) Crystal Detectors
H. S. Lee et al. (KIMS Collaboration)
Published 28 August 2007
091301   Abstract    Full Text: [ PDF (290 kB)  GZipped PS   ]   
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Septiembre 2007

Nonlocal Cosmology
S. Deser and R. P. Woodard
Published 14 September 2007
111301   Abstract    Full Text: [ PDF (87 kB)  GZipped PS   ]   
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Measuring a Parity-Violation Signature in the Early Universe via
Ground-Based Laser Interferometers
Naoki Seto and Atsushi Taruya
Published 17 September 2007
121101   Abstract    Full Text: [ PDF (241 kB)  GZipped PS   ]   
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Gravitational Waves from Relativistic Neutron-Star Mergers with
Microphysical Equations of State
R. Oechslin and H.-T. Janka
Published 19 September 2007
121102   Abstract    Full Text: [ PDF (261 kB)  GZipped PS   ]   
Order

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Compatibility of the Chameleon-Field Model with Fifth-Force
Experiments, Cosmology, and PVLAS and CAST Results
Philippe Brax, Carsten van de Bruck, and Anne-Christine Davis
Published 21 September 2007
121103   Abstract    Full Text: [ PDF (98 kB)  GZipped PS   ]   
Order

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Decaying Warm Dark Matter and Neutrino Masses
M. Lattanzi and J. W. F. Valle
Published 20 September 2007
121301   Abstract    Full Text: [ PDF (292 kB)  GZipped PS   ]   
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Spontaneous Lorentz Breaking and Massive Gravity
Z. Berezhiani, D. Comelli, F. Nesti, and L. Pilo
Published 28 September 2007
131101   Abstract    Full Text: [ PDF (113 kB)  GZipped PS   ]   
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Searching for Decaying Axionlike Dark Matter from Clusters of
Galaxies
Signe Riemer-Sørensen, Konstantin Zioutas, Steen H. Hansen, Kristian
Pedersen, Håkon Dahle, and Anastasios Liolios
Published 28 September 2007
131301   Abstract    Full Text: [ PDF (625 kB)  GZipped PS   ]   
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Octubre 2007

Constraining Unparticle Physics with Cosmology and Astrophysics
Hooman Davoudiasl
Published 1 October 2007
141301   Abstract    Full Text: [ PDF (134 kB)  GZipped PS   ]   
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Probing Gravity at Cosmological Scales by Measurements which Test the
Relationship between Gravitational Lensing and Matter Overdensity
Pengjie Zhang, Michele Liguori, Rachel Bean, and Scott Dodelson
Published 4 October 2007
141302   Abstract    Full Text: [ PDF (176 kB)  GZipped PS   ]   
Order

Elementary Particles and Fields 
[ Previous / Next Subject | Issue Index | Top / Bottom of Page]

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A Delicate Universe: Compactification Obstacles to D-brane Inflation
Daniel Baumann, Anatoly Dymarsky, Igor R. Klebanov, Liam McAllister,
and Paul J. Steinhardt
Published 1 October 2007
141601   Abstract    Full Text: [ PDF (139 kB)  GZipped PS   ]   
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Identification of Weakly Interacting Massive Particles Through a
Combined Measurement of Axial and Scalar Couplings
G. Bertone, D. G. Cerdeño, J. I. Collar, and B. Odom
Published 8 October 2007
151301   Abstract    Full Text: [ PDF (389 kB)  GZipped PS   ]   
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Loop-Quantum-Gravity Vertex Amplitude
Jonathan Engle, Roberto Pereira, and Carlo Rovelli
Published 16 October 2007
161301   Abstract    Full Text: [ PDF (122 kB)  GZipped PS   ]   
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Vacuum Sampling in the Landscape during Inflation
Hooman Davoudiasl, Saswat Sarangi, and Gary Shiu
Published 18 October 2007
161302   Abstract    Full Text: [ PDF (93 kB)  GZipped PS   ]   
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Enhanced Brane Tunneling and Instanton Wrinkles
Adam R. Brown, Saswat Sarangi, Benjamin Shlaer, and Amanda Weltman
Published 17 October 2007
161601   Abstract    Full Text: [ PDF (137 kB)  GZipped PS   ]   
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Observations of the Askaryan Effect in Ice
P. W. Gorham et al. (ANITA Collaboration)
Published 25 October 2007
171101   Abstract    Full Text: [ PDF (1641 kB)  GZipped PS   ]   
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Charting the Landscape of Supercritical String Theory
Simeon Hellerman and Ian Swanson
Published 24 October 2007
171601   Abstract    Full Text: [ PDF (149 kB)  GZipped PS   ]   
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Consistency of Post-Newtonian Waveforms with Numerical Relativity
John G. Baker, James R. van Meter, Sean T. McWilliams, Joan
Centrella, and Bernard J. Kelly
Published 29 October 2007
181101   Abstract    Full Text: [ PDF (272 kB)  GZipped PS   ]   
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Noviembre 2007

Overspinning a Nearly Extreme Charged Black Hole via a Quantum
Tunneling Process
George E. A. Matsas and André R. R. da Silva
Published 1 November 2007
181301   Abstract    Full Text: [ PDF (189 kB)  GZipped PS   ]   
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Resolving Cosmic Gamma Ray Anomalies with Dark Matter Decaying Now
Jose A. R. Cembranos, Jonathan L. Feng, and Louis E. Strigari
Published 8 November 2007
191301   Abstract    Full Text: [ PDF (241 kB)  GZipped PS   ]   
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Gravitational Particle Production in Braneworld Cosmology
C. Bambi and F. R. Urban
Published 9 November 2007
191302   Abstract    Full Text: [ PDF (101 kB)  GZipped PS   ]   
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Conceptual Explanation for the Algebra in the Noncommutative Approach
to the Standard Model
Ali H. Chamseddine and Alain Connes
Published 8 November 2007
191601   Abstract    Full Text: [ PDF (92 kB)  GZipped PS   ]   
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Black-Hole No-Hair Theorems for a Positive Cosmological Constant
Sourav Bhattacharya and Amitabha Lahiri
Published 16 November 2007
201101   Abstract    Full Text: [ PDF (99 kB)  GZipped PS   ]   
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Prospects for Detection of Gravitational Waves from
Intermediate-Mass-Ratio Inspirals
Duncan A. Brown, Jeandrew Brink, Hua Fang, Jonathan R. Gair, Chao Li,
Geoffrey Lovelace, Ilya Mandel, and Kip S. Thorne
Published 16 November 2007
201102   Abstract    Full Text: [ PDF (106 kB)  GZipped PS   ]   
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[IMAGE]Analogue of Cosmological Particle Creation in an Ion Trap Ralf
Schützhold, Michael Uhlmann, Lutz Petersen, Hector Schmitz, Axel
Friedenauer, and Tobias Schätz
Published 12 November 2007
201301   Abstract    Full Text: [ PDF (193 kB)  GZipped PS   ]   
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Friedmann Equations and Thermodynamics of Apparent Horizons
Yungui Gong and Anzhong Wang
Published 20 November 2007
211301   Abstract    Full Text: [ PDF (104 kB)  GZipped PS   ]   
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Gravitational Wave Production at the End of Inflation
Richard Easther, John T. Giblin, Jr., and Eugene A. Lim
Published 26 November 2007
221301   Abstract    Full Text: [ PDF (130 kB)  GZipped PS   ]   
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[IMAGE]Counting the Microstates of a Kerr Black Hole in M Theory Gary
T. Horowitz and Matthew M. Roberts
Published 30 November 2007
221601   Abstract    Full Text: [ PDF (122 kB)  GZipped PS   ]   
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Diciembre 2007

Are Neutron Stars with Crystalline Color-Superconducting Cores
Relevant for the LIGO Experiment?
B. Haskell, N. Andersson, D. I. Jones, and L. Samuelsson
Published 4 December 2007
231101   Abstract    Full Text: [ PDF (223 kB)  GZipped PS   ]   
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Detecting Axionlike Particles with Gamma Ray Telescopes
Dan Hooper and Pasquale D. Serpico
Published 6 December 2007
231102   Abstract    Full Text: [ PDF (175 kB)  GZipped PS   ]   
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Upper Bound on the Dark Matter Total Annihilation Cross Section
John F. Beacom, Nicole F. Bell, and Gregory D. Mack
Published 5 December 2007
231301   Abstract    Full Text: [ PDF (191 kB)  GZipped PS   ]   
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Plasma Suppression of Large Scale Structure Formation in the Universe
Pisin Chen and Kwang-Chang Lai
Published 4 December 2007
231302   Abstract    Full Text: [ PDF (139 kB)  GZipped PS   ]   
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New Post-Newtonian Parameter to Test Chern-Simons Gravity
Stephon Alexander and Nicolas Yunes
Published 10 December 2007
241101   Abstract    Full Text: [ PDF (106 kB)  GZipped PS   ]   
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Geometry and Regularity of Moving Punctures
Mark Hannam, Sascha Husa, Denis Pollney, Bernd Brügmann, and Niall Ó
Murchadha
Published 12 December 2007
241102   Abstract    Full Text: [ PDF (148 kB)  GZipped PS   ]   
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Testing for Lorentz Violation: Constraints on
Standard-Model-Extension Parameters via Lunar Laser Ranging
James B. R. Battat, John F. Chandler, and Christopher W. Stubbs
Published 13 December 2007
241103   Abstract    Full Text: [ PDF (164 kB)  GZipped PS   ]   
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Exact Solution to the Averaging Problem in Cosmology
David L. Wiltshire
Published 20 December 2007
251101   Abstract    Full Text: [ PDF (109 kB)  GZipped PS   ]   
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Self-Regulation of Solar Coronal Heating Process via the
Collisionless Reconnection Condition
Dmitri A. Uzdensky
Published 26 December 2007
261101   Abstract    Full Text: [ PDF (90 kB)  GZipped PS   ]   
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Unifying Inflation and Dark Matter with Neutrino Masses
Rouzbeh Allahverdi, Bhaskar Dutta, and Anupam Mazumdar
Published 28 December 2007
261301   Abstract    Full Text: [ PDF (217 kB)  GZipped PS   ]   
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http://xxx.lanl.gov/abs/0712.0486

Halos of Unified Dark Matter Scalar Field

Authors: Daniele Bertacca, Nicola Bartolo, Sabino Matarrese (Physics Dept. and INFN, Padova, ITALY)
(Submitted on 4 Dec 2007)
Abstract: We investigate the static and spherically symmetric solutions of Einstein's equations for a scalar field with non-canonical kinetic term, assumed to provide both the dark matter and dark energy components of the Universe. In particular, we give a prescription to obtain solutions (dark halos) whose rotation curve v_c(r) is in good agreement with observational data. We show that there exist suitable scalar field Lagrangians that allow to describe the cosmological background evolution and the static solutions with a single dark fluid.
Comments: 19 pages LaTeX file
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0712.0486v1 [astro-ph]

Submission history
From: Sabino Matarrese [view email]

Astrophysics, abstract
astro-ph/0702015
From: Zong-Kuan Guo [view email]
Date (v1): Thu, 1 Feb 2007 03:17:17 GMT (136kb)
Date (revised v2): Tue, 6 Feb 2007 13:24:20 GMT (136kb)

Probing the Coupling between Dark Components of the Universe

Authors: Zong-Kuan Guo, Nobuyoshi Ohta, Shinji Tsujikawa

Comments: 8 pages, 7 figures, RevTeX, references added
Report-no: KU-TP 012

We place observational constraints on a coupling between dark energy and dark matter by using 71 Type Ia supernovae (SNe Ia) from the first year of the five-year Supernova Legacy Survey (SNLS), the cosmic microwave background (CMB) shift parameter from the three-year Wilkinson Microwave Anisotropy Probe (WMAP), and the baryon acoustic oscillation (BAO) peak found in the Sloan Digital Sky Survey (SDSS). The interactions we study are (i) constant coupling delta and (ii) varying coupling delta(z) that depends on a redshift z, both of which have simple parametrizations of the Hubble parameter to confront with observational data. We find that the combination of the three databases marginalized over a present dark energy density gives stringent constraints on the coupling, -0.08 < delta < 0.03 (95% CL) in the constant coupling model and -0.4 < delta_0 < 0.1 (95% CL) in the varying coupling model, where delta_0 is a present value. The uncoupled LambdaCDM model (w_X = -1 and delta = 0) still remains a good fit to the data, but the negative coupling (delta < 0) with a phantom equation of state of dark energy (w_X < -1) is slightly favoured over the LambdaCDM model.