Results 121 to 130 of about 48,355 (157)

Inflation and Cosmological Perturbations

, 2003
23 pages, 7 figures; to be published in "The Future of Theoretical Physics and Cosmology," eds: G.W. Gibbons, E.P.S.
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A step in flux to suppress axion isocurvature

Journal of High Energy Physics
The QCD axion in the pre-inflation scenario faces a stringent isocurvature constraint, which requires a relatively low Hubble scale during inflation. If the axion was heavier than the Hubble scale during inflation, its isocurvature is suppressed and the ...
Priyesh Chakraborty, Junyi Cheng, Matthew Reece, Zekai Wang   +3 more
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Novel Possibility of Nonstandard Statistics in the Inflationary Spectrum of Primordial Inhomogeneities

Symmetry, Integrability and Geometry: Methods and Applications, 2012
Inflation is considered one of the cornerstones of modern cosmology. However, the account of the origin of cosmic structure, as provided by the standard inflationary paradigm, is not fully satisfactory. The fundamental issue is the inability of the usual
Gabriel León, Daniel Sudarsky
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Stochastic cosmological inflation

, 2009
thesis
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Inflation and isotropization in quintom cosmology

Journal of Cosmology and Astroparticle Physics
Abstract This paper studies inflation and isotropization in the quintom model in the Bianchi-I, Bianchi-III, and Kantowski-Sachs backgrounds. First, we investigate inherent properties and generalize Heusler's proposition. Then by the use of the dynamical system approach, we consider the system in multiplicative and collective modes of ...
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Inflation in string cosmology

, 2011
Cosmic inflation is responsible for the primordial density fluctuations which are the seeds of today's large-scale structures and which are observed through the temperature fluctuations of the Cosmic Microwave Background. In this thesis, we explore a particular model of inflation with modified kinetics : Dirac-Born-Infeld (DBI) inflation inspired by ...
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Inflation and cosmological parameter estimation

, 2007
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Inflation in inhomogeneous cosmology

Physical Review D, 1992
We discuss the onset of inflation in an inhomogeneous, asymptotically Friedmann-Robertson-Walker universe coupled to a scalar inflaton field. We consider a three-parameter family of inhomogeneous Cauchy data, for which we can solve analytically the constraint equations.
, Calzetta, , Sakellariadou
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Inflation and quantum cosmology

Physica Scripta, 1990
Contents: 1. Introduction; 2. Chaotic inflation; 3. Self-reproducing inflationary universe; 4. Adjusting to the new paradigm: absence of cosmological constraints on the axion mass in the inflationary cosmology; 5. Inflation and the wave function of the universe; 6. Chaotic inflation versus extended inflation; 7. Stochastic approach to the baby universe
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Cosmological perturbations from inflation

Journal of Physics A: Mathematical and Theoretical, 2007
Matter is distributed very homogeneously and isotropically on scales larger than a few hundred Mpc. The measurements of the microwave background temperature fluctuations show that at recombination the universe was extremely homogeneous and isotropic (with accuracy ∼10 −4 ) on all scales up to the present horizon (Spergel et al 2006 Preprint astro-ph ...
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