Gamma Rays from Ultracompact Primordial Dark Matter Minihalos
Pat Scott and Sofia Sivertsson
Ultracompact minihalos have been proposed as a new class of dark matter structure. They would be produced by phase transitions in the early Universe or features in the inflaton potential, and constitute nonbaryonic massive compact halo objects today. We examine the prospects of detecting these minih ... [Phys. Rev. Lett. 103, 211301 (2009)] published Fri Nov 20, 2009.
Cosmology with unparticles
Bohdan Grzadkowski and Jose Wudka
We discuss cosmological consequences of the existence of physics beyond the standard model that exhibits Banks-Zaks and unparticle behavior in the UV and IR, respectively. We first derive the equation of state for unparticles and use it to obtain the temperature dependence of the corresponding energ ... [Phys. Rev. D 80, 103518 (2009)] published Fri Nov 20, 2009.
Impact of a strongly first-order phase transition on the abundance of thermal relics
Carroll Wainwright and Stefano Profumo
We study the impact of a strongly first-order electroweak phase transition on the thermal relic abundance of particle species that could constitute the dark matter and that decoupled before the phase transition occurred. We define a dilution factor induced by generic first-order phase transitions, a ... [Phys. Rev. D 80, 103517 (2009)] published Thu Nov 19, 2009.
CMB lensing constraints on dark energy and modified gravity scenarios
Erminia Calabrese, Asantha Cooray, Matteo Martinelli, Alessandro Melchiorri, Luca Pagano et al.
Weak gravitational lensing leaves a characteristic imprint on the cosmic microwave background temperature and polarization angular power spectra. Here, we investigate the possible constraints on the integrated lensing potential from future cosmic microwave background angular spectra measurements exp ... [Phys. Rev. D 80, 103516 (2009)] published Thu Nov 19, 2009.
Lucky interferometry for displacement measurement
Bogdan Ionita, Petre Catalin Logofatu, and Dan Apostol
We extrapolated the lucky imaging technique, mostly used in astronomy, to the field of interferometry for displacement measurement. From the batch of interferograms generated by a TwymanGreen-type interferometer and acquired by a CCD camera, those with high overall contrast were selected and fitted ... [Opt. Eng. 48, 115602 (2009)] published Wed Nov 18, 2009.
Holes in the static Einstein universe and a model of the cosmological voids
Andrzej Odrzywolek
A spherically symmetric, static model of the cosmological voids is constructed in the framework of the Tolman-Oppenheimer-Volkov equation with the cosmological constant. Extension of the Tooper result (dimensionless form of the TOV equation) is provided for nonzero Lambda. Then, the equation is simp ... [Phys. Rev. D 80, 103515 (2009)] published Tue Nov 17, 2009.
Cosmic steps in modeling dark energy
Tower Wang
Past and recent data analyses gave some hints of steps in dark energy. Considering dark energy as a dynamical scalar field, we investigate several models with various steps: a step in the scalar potential, a step in the kinetic term, a step in the energy density, and a step in the equation-of-state ... [Phys. Rev. D 80, 101302 (2009)] published Tue Nov 17, 2009.
Assisted dark energy
Junko Ohashi and Shinji Tsujikawa
Cosmological scaling solutions, which give rise to a scalar-field density proportional to a background fluid density during radiation and matter eras, are attractive to alleviate the energy scale problem of dark energy. In the presence of multiple scalar fields, the scaling solution can exit to the ... [Phys. Rev. D 80, 103513 (2009)] published Mon Nov 16, 2009.
Sensitivity of cosmic-ray experiments to ultrahigh-energy photons: Reconstruction of the spectrum and limits on the superheavy dark matter
O. E. Kalashev, G. I. Rubtsov, and S. V. Troitsky
We estimate the sensitivity of various experiments detecting ultrahigh-energy cosmic rays to primary photons with energies above 10 eV. We demonstrate that the energy of a primary photon may be significantly (up to a factor of ~10) underestimated or overestimated for particular primary energies and ... [Phys. Rev. D 80, 103006 (2009)] published Mon Nov 16, 2009.
Constraint on coupled dark energy models from observations
Jun-Qing Xia
The coupled dark energy models, in which the quintessence scalar field nontrivially couples to the cold dark matter, have been proposed to explain the coincidence problem. In this paper we study the perturbations of coupled dark energy models and the effects of this interaction on the current observ ... [Phys. Rev. D 80, 103514 (2009)] published Mon Nov 16, 2009.
Magnetic Fluctuation Power Near Proton Temperature Anisotropy Instability Thresholds in the Solar Wind
S. D. Bale, J. C. Kasper, G. G. Howes, E. Quataert, C. Salem et al.
The proton temperature anisotropy in the solar wind is known to be constrained by the theoretical thresholds for pressure-anisotropy-driven instabilities. Here, we use approximately 1 x 10 independent measurements of gyroscale magnetic fluctuations in the solar wind to show for the first time that t ... [Phys. Rev. Lett. 103, 211101 (2009)] published Mon Nov 16, 2009.
Inflaton two-point correlation in the presence of a cosmic string
Chien-Yao Tseng and Mark B. Wise
Precise measurements of the microwave background anisotropy have confirmed the inflationary picture of approximately scale invariant, Gaussian primordial adiabatic density perturbations. However, there are some anomalies that suggest a small violation of rotational and/or translational invariance in ... [Phys. Rev. D 80, 103512 (2009)] published Fri Nov 13, 2009.
Sterile neutrinos produced near the electroweak scale: Mixing angles, MSW resonances, and production rates
Jun Wu, Chiu Man Ho, and Daniel Boyanovsky
We study the production of sterile neutrinos in the region T~M in an extension beyond the standard model with the seesaw mass matrix originating in Yukawa couplings to Higgs-like scalars with masses and vev's of the order of the electroweak scale. Sterile neutrinos are produced by the decay of scala ... [Phys. Rev. D 80, 103511 (2009)] published Fri Nov 13, 2009.
Multimessenger constraints on the annihilating dark matter interpretation of the positron excess
Miguel Pato, Lidia Pieri, and Gianfranco Bertone
The rise in the energy spectrum of the positron ratio, observed by the PAMELA satellite above 10 GeV, and other cosmic-ray measurements, have been interpreted as a possible signature of dark matter annihilation in the Galaxy. However, the large number of free parameters, and the large astrophysical ... [Phys. Rev. D 80, 103510 (2009)] published Fri Nov 13, 2009.
A Possible Interpretation of Dark Energy and Matter of the Expanding Universe
B. Lehnert
At present the expanding universe is observed to be dominated by the not fully understood concepts of dark energy and matter, in a conceived almost flat Euclidian geometry. As one of the possible efforts to understand its global behaviour, the present paper attempts to explain these concepts in term ... [AIP Conf. Proc. 1188, 345 (2009)] published Thu Nov 12, 2009.
A New Approach to the Coronal Heating Problem
J. Vranjes and S. Poedts
The heating of the solar corona is discussed within both frameworks of kinetic and fluid drift wave theory. It is shown that the basic ingredient necessary for the heating is the presence of the background density gradients in the direction perpendicular to the magnetic field vector. These gradients ... [AIP Conf. Proc. 1188, 153 (2009)] published Thu Nov 12, 2009.
Dust Destruction in a Nonradiative Shock in the Cygnus Loop Supernova Remnant
Ravi Sankrit, Brian J. Williams, Kazimierz J. Borkowski, John C. Raymond, Terrance J. Gaetz et al.
We present 24 [mu]m and 70 [mu]m images of a non-radiative shock in the Cygnus Loop supernova remnant, obtained with the Multiband Imaging Photometer on board the Spitzer Space Telescope. The observed emission is from dust grains heated in the post-shock region. The 70 [mu]m to 24 [mu]m flux ratio d ... [AIP Conf. Proc. 1183, 95 (2009)] published Thu Nov 12, 2009.
Drift Kinetic Theory and Cosmic Rays
G. M. Webb, J. A. le Roux, and G. P. Zank
Starting from the Vlasov or Boltzmann equation for cosmic rays in a random and regular magnetic field, we introduce guiding center coordinates and transform the velocity to a frame moving at the electric field drift velocity. The resultant equation is written in terms of the parallel and perpendicul ... [AIP Conf. Proc. 1183, 85 (2009)] published Thu Nov 12, 2009.
Particle Acceleration at Relativistic Shocks in Extragalactic Systems
Matthew G. Baring and Errol J. Summerlin
Diffusive shock acceleration (DSA) at relativistic shocks is expected to be an important acceleration mechanism in a variety of astrophysical objects including extragalactic jets in active galactic nuclei and gamma ray bursts. These sources remain strong and interesting candidate sites for the gener ... [AIP Conf. Proc. 1183, 74 (2009)] published Thu Nov 12, 2009.
Wave Dynamics and Particle Acceleration in Shock Precursors
M. A. Malkov and P. H. Diamond
Cosmic ray protons accelerated in strong shocks are known to drive various instabilities in the shock precursor. An acoustic instability of the shock precursor driven by the pressure gradient of accelerated particles is studied in the nonlinear regime. After nonlinear steepening of the unstable wave ... [AIP Conf. Proc. 1183, 66 (2009)] published Thu Nov 12, 2009.
Non-linear Guiding Center Theory and Acceleration of Cosmic Rays at Supernova Remnant Shocks
G. Li, G. Webb, A. Shalchi, and G. P. Zank
Supernova Remnant shocks have long been identified as the major site of cosmic ray acceleration. At the shock front, cosmic rays traverse upstream and downstream multiple times and gain energies up to 10 eV and perhaps even reach 10 eV. The maximum achievable energy at a SNR shock is decided by many ... [AIP Conf. Proc. 1183, 57 (2009)] published Thu Nov 12, 2009.
Revealing an Energetic Galaxy-Wide Outflow in a z~2 Ultraluminous Infrared Galaxy. (arXiv:0911.3666v1 [astro-ph.CO])
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Temporal properties of GX 301-2 over a year-long observation with SuperAGILE. (arXiv:0911.3743v1 [astro-ph.HE])
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Catalog of Radio Galaxies with z>0.3. II: Photometric Data. (arXiv:0911.3747v1 [astro-ph.CO])
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Catalog of Radio Galaxies with z>0.3. III: Angular Sizes and Flux Density According to the NVSS Data. (arXiv:0911.3752v1 [astro-ph.CO])
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Metallicity gradients in the Milky Way. (arXiv:0911.3763v1 [astro-ph.GA])
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Molecular Gas in NUclei of GAlaxies (NUGA) XIII. The interacting Seyfert 2/LINER galaxy NGC 5953. (arXiv:0911.3772v1 [astro-ph.CO])
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Characteristic velocities of stripped-envelope core-collapse supernova cores. (arXiv:0911.3774v1 [astro-ph.HE])
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The circumnuclear environment of the peculiar galaxy NGC 3310. (arXiv:0911.3778v1 [astro-ph.CO])
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Catalog of Radio Galaxies with z>0.3. I:Construction of the Sample. (arXiv:0911.3741v1 [astro-ph.CO])
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Dissecting the Lyman Alpha Emission Halo of LAB1. (arXiv:0911.3667v1 [astro-ph.CO])
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An Evaluation of the Excitation Class Parameter for the Central Stars of Planetary Nebulae. (arXiv:0911.3689v1 [astro-ph.SR])
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Planetary Formation and Evolution Revealed with a Saturn Entry Probe: The Importance of Noble Gases. (arXiv:0911.3699v1 [astro-ph.EP])
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Simulating X-ray Supercavities and Their Impact on Galaxy Clusters. (arXiv:0911.3709v1 [astro-ph.CO])
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The Role of Starburst-AGN composites in Luminous Infrared Galaxy Mergers: Insights from the New Optical Classification Scheme. (arXiv:0911.3728v1 [astro-ph.CO])
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Search for chameleon-like scalar fields with the ammonia method. (arXiv:0911.3732v1 [astro-ph.CO])
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Dust tori in radio galaxies. (arXiv:0911.3734v1 [astro-ph.GA])
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The VIMOS VLT Deep Survey: the group catalogue. (arXiv:0911.3740v1 [astro-ph.CO])
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The Skeleton: Connecting Large Scale Structures to Galaxy Formation. (arXiv:0911.3779v1 [astro-ph.CO])
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Spiral-like structure in nearby clusters of galaxies. (arXiv:0911.3785v1 [astro-ph.CO])
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Extent radiation in different types of radio sources. (arXiv:0911.3826v1 [astro-ph.CO])
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Advanced Technology Large-Aperture Space Telescope (ATLAST): Characterizing Habitable Worlds. (arXiv:0911.3841v1 [astro-ph.EP])
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Physical Properties of Young Brown Dwarfs and Very Low-Mass Stars Inferred from High-Resolution Model Spectra. (arXiv:0911.3844v1 [astro-ph.SR])
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Light-cone observations and cosmological models: implications for inhomogeneous models mimicking dark energy. (arXiv:0911.3852v1 [astro-ph.CO])
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Spatial and temporal variations of fundamental constants. (arXiv:0911.3853v1 [astro-ph.CO])
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The Formation of Uranus and Neptune in Solid-Rich Feeding Zones: Connecting Chemistry and Dynamics. (arXiv:0911.3873v1 [astro-ph.EP])
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Star Formation in Dwarf Galaxies of the Nearby Centaurus A Group. (arXiv:0911.3879v1 [astro-ph.GA])
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Intrinsic colors and ages of extremely red elliptical galaxies at high redshift. (arXiv:0911.3825v1 [astro-ph.CO])
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Bayesian coherent analysis of in-spiral gravitational wave signals with a detector network. (arXiv:0911.3820v1 [astro-ph.CO])
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Large-scale magnetic fields in cosmology. (arXiv:0911.3790v1 [astro-ph.CO])
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Surface structure of the CoRoT CP2 target star HD 50773. (arXiv:0911.3791v1 [astro-ph.SR])
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Rotational asymmetry of pulsar profiles. (arXiv:0911.3798v1 [astro-ph.HE])
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Searching for flickering statistics in T CrB. (arXiv:0911.3804v1 [astro-ph.SR])
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The discovery of a massive white dwarf in the peculiar binary system HD 49798/RX J0648.0-4418. (arXiv:0911.3809v1 [astro-ph.HE])
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ACRIM-gap and total solar irradiance revisited: Is there a secular trend between 1986 and 1996?. (arXiv:0911.3817v1 [astro-ph.SR])
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Metal Enrichment via Ram Pressure Stripping in the IGM of the Compact Galaxy Group RGH 80. (arXiv:0911.3883v2 [astro-ph.CO])
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Slow Diffusive Gravitational Instability Before Decoupling. (arXiv:0911.3665v1 [astro-ph.CO])
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The age of cataclysmic variables: a kinematical study. (arXiv:0911.3651v1 [astro-ph.GA])
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Characterizing Magnetohydrodynamic Turbulence in the Small Magellanic Cloud. (arXiv:0911.3652v1 [astro-ph.GA])
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Revealing the sub-AU asymmetries of the inner dust rim in the disk around the Herbig Ae star R CrA. (arXiv:0911.3653v1 [astro-ph.SR])
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Local Group Dwarf Elliptical Galaxies: II. Stellar Kinematics to Large Radii in NGC 147 and NGC 185. (arXiv:0911.3654v1 [astro-ph.CO])
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Magnetic field evolution of white dwarfs in strongly interacting binary star systems. (arXiv:0911.3657v1 [astro-ph.SR])
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Screening and Antiscreening of the MOND field in Perturbed Spherical Systems. (arXiv:0911.3658v1 [astro-ph.CO])
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Derivation of a Relation for the Steepening of TeV Selected Blazar Gamma-ray Spectra with Energy and Redshift. (arXiv:0911.3659v1 [astro-ph.CO])
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Brown dwarfs forming in discs: where to look for them?. (arXiv:0911.3662v1 [astro-ph.GA])
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Cold dark matter from "strong gravity". (arXiv:0706.3050v2 [gr-qc] UPDATED)
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Precise mass and radius values for the white dwarf and low mass M dwarf in the pre-cataclysmic binary NN Serpentis. (arXiv:0909.4307v2 [astro-ph.SR] UPDATED)
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Entropy Perturbations in N-flation. (arXiv:0909.5251v2 [astro-ph.CO] UPDATED)
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Constraints on inelastic dark matter from XENON10. (arXiv:0910.3698v2 [astro-ph.CO] UPDATED)
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Implications of infalling Fe II - emitting clouds in active galactic nuclei: anisotropic properties. (arXiv:0911.1173v2 [astro-ph.CO] UPDATED)
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On the DB gap of white dwarf evolution: effects of hydrogen mass fraction and convective overshooting. (arXiv:0911.2949v2 [astro-ph.SR] UPDATED)
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Constraining the Dark Energy Equation of State using Alternative High-z Cosmic Tracers. (arXiv:0911.3198v2 [astro-ph.CO] UPDATED)
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Companion stars of Type Ia supernovae and hypervelocity stars. (arXiv:0911.3316v2 [astro-ph.SR] UPDATED)
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Quasar Outflow Contribution to AGN Feedback: Observations of QSO SDSS J0838+2955. (arXiv:0911.3332v2 [astro-ph.CO] UPDATED)
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The impact of a strongly first-order phase transition on the abundance of thermal relics. (arXiv:0909.1317v2 [hep-ph] UPDATED)
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Tunneling and propagation of vacuum bubbles on dynamical backgrounds. (arXiv:0908.2757v2 [gr-qc] UPDATED)
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Sensitivity of cosmic-ray experiments to ultra-high-energy photons: reconstruction of the spectrum and limits on the superheavy dark matter. (arXiv:0812.1020v2 [astro-ph] UPDATED)
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Angular Momentum and the Formation of Stars and Black Holes. (arXiv:0901.4325v4 [astro-ph.SR] UPDATED)
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Electric dipole moments and disalignment of interstellar dust grains. (arXiv:0905.2176v2 [astro-ph.GA] UPDATED)
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A (giant) void is not mandatory to explain away dark energy with a Lemaitre -- Tolman model. (arXiv:0906.0905v3 [astro-ph.CO] UPDATED)
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The Nova Shell and Evolution of the Recurrent Nova T Pyxidis. (arXiv:0906.0933v2 [astro-ph.SR] UPDATED)
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Reynolds stresses from hydrodynamic turbulence with shear and rotation. (arXiv:0906.1200v2 [astro-ph.SR] UPDATED)
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Origin of Life. (arXiv:0907.3552v10 [physics.gen-ph] UPDATED)
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COSMOS 5921+0638: Characterization and analysis of a new strong gravitationally lensed AGN. (arXiv:0907.4145v2 [astro-ph.CO] UPDATED)
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The alpha effect in rotating convection with sinusoidal shear. (arXiv:0908.2423v2 [astro-ph.SR] UPDATED)
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A Photometric Transit Search for Planets around Cool Stars from the Italian Alps: Results from a Feasibility Study. (arXiv:0911.3587v2 [astro-ph.EP] UPDATED)
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Is the future universe singular: Dark Matter versus modified gravity?. (arXiv:0911.2781v1 [hep-th] CROSS LISTED)
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Quasi-Single Field Inflation and Non-Gaussianities. (arXiv:0911.3380v2 [hep-th] CROSS LISTED)
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Universal properties of Dark Matter halos. (arXiv:0911.3396v1 [astro-ph.CO] CROSS LISTED)
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