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Unification models with reheating via Primordial Black Holes
Unification models reheating via Primordial Black Holes
2011/10/20
We study the possibility of reheating the universe through the evaporation of Primordial Black Holes created at the end of inflation. This is shown to allow for the unification of inflation and dark m...
Feynman-like Rules for Calculating n-Point Correlators of the Primordial Curvature Perturbation
ing n-Point Correlators Primordial Curvature Perturbation
2011/10/10
A diagrammatic approach to calculate n-point correlators of the primordial curvature perturbation \zeta was developed a few years ago following the spirit of the Feynman rules in Quantum Field Theory....
Quantum Origin of the Primordial Fluctuation Spectrum and its Statistics
Quantum Origin Primordial Fluctuation Spectrum Statistics
2011/10/9
The account of the origin of cosmic structure, as provided by the standard inflationary paradigm, is not fully satisfactory, as has been argued in Perez et al 2006. The central point of that work is t...
Quantum fluctuations in planar domain-wall space-times: A possible origin of primordial preferred direction
Quantum fluctuations planar domain-wall space-times possible origin primordial preferred direction
2011/10/18
We study the gravitational effects of a planar domain wall on quantum fluctuations of a massless scalar field during inflation. By obtaining an exact solution of the scalar field equation in de Sitter...
Measuring primordial non-Gaussianity through weak lensing peak counts
Measuring primordial non-Gaussianity weak lensing peak counts
2011/1/11
We explore the possibility of detecting primordial non-Gaussianity of the local type using weak lensing peak counts. We measure the peak abundance in sets of simulated weak lensing maps corresponding ...
The Birth of a Galaxy: Primordial Metal Enrichment and Population II Stellar Populations
cosmology methods numerical hydrodynamics radiative transfer star formation
2010/11/15
Population III stars first form in dark matter halos with masses around 106M⊙. By definition,
they are metal-free, and their protostellar collapse is driven by molecular hydrogen cooling in the gas-p...
Impact of Primordial Ultracompact Minihaloes on the Intergalactic Medium and First Structure Formation
intergalactic medium dark matter cosmology theory early Universe galaxies structure
2010/11/12
The effects of dark matter annihilation on the evolution of intergalactic medium(IGM) in the early Universe can be more important if dark matter structure is more concentrated. Ultracompact Minihaloes...
Inflation in Entropic Cosmology: Primordial Perturbations and non-Gaussianities
Inflation Primordial Perturbations non-Gaussianities
2010/11/16
We investigate thermal inflation in double-screen entropic cosmology. We find that its realization is general, resulting from the system evolution from non-equilibrium to equilibrium. Furthermore,goin...
Primordial non-Gaussianity in the Bispectrum of the Halo Density Field
Inflation Large Scale Structure Primordial non-Gaussianity
2010/11/11
The bispectrum vanishes for linear Gaussian elds and is thus a sensitive probe of non-
linearities and non-Gaussianities in the cosmic density eld. Hence, a detection of the bispectrum in the halo ...
Effects of Varying the Three-Body Molecular Hydrogen Formation Rate in Primordial Star Formation
galaxies formation stars formation ISM H II regions cos-mology theory
2010/11/12
The transformation of atomic hydrogen to molecular hydrogen through three-body reactions is a crucial stage in the collapse of primordial, metal-free halos,where the rst generation of stars (Populati...
Primordial magnetic fields with X-ray and S-Z cluster survey
Primordial magnetic fields X-ray and S-Z cluster survey
2011/1/10
The effect of primordial magnetic fields on X-ray or S-Z galaxy cluster survey is investigated. After recombination, the primordial magnetic fields generate additional density fluctuations. Such densi...
The Early Evolution of Primordial Pair-Instability Supernovae
Primordial Pair-Instability Supernovae
2011/1/10
The observational signatures of the first cosmic explosions and their chemical imprint on second-generation stars both crucially depend on how heavy elements mix within the star at the earliest stages...
The Nature of Primordial Fluctuations from Anisotropic Inflation
Primordial Fluctuations Anisotropic Inflation
2010/3/9
We study the statistical nature of primordial fluctuations from an anisotropic inflation which is realized by a vector field coupled to an inflaton. We find a suitable gauge, which we call the canonic...
The primordial binary population in ob associations。
Photoionization Models of Metal-poor Extragalactic H o Regions And the Primordial Helium Abundance
Photoionization Primordial Helium Abundance Metal-poor Extragalactic H o Regions
2009/6/9
Photoionization Models of Metal-poor Extragalactic H o Regions And the Primordial Helium Abundance。