Inflationary predictions at small γ

2008/12/08 by Ewa Czuchry · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Classical mechanics #Computer science #Constant (computer programming) #Cosmology and Gravitation Theories #Dirac (video compression format) #Galaxies: Formation, Evolution, Phenomena #Inflation (cosmology) #Kinetic energy #Mathematical physics #Non-Gaussianity #Observable #Parametrization (atmospheric modeling) #Physics #Quantum mechanics #Range (aeronautics) #Simple (philosophy) #Slow roll #Statistical physics #Theoretical physics #astro-ph

paper · pdf · doi:10.1016/j.physletb.2009.05.065

published in Physics Letters B 678(1), 9-14 (Elsevier BV) · 17 pages, 1 figure

arxiv created 2008/12/08 · openalex publication_date 2009/06/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

This Letter explores single field inflation models with a constant, but arbitrary speed of sound cs, obtained by deforming the kinetic energy terms to a Dirac–Born–Infeld form. Allowing cs<1 provides a simple parametrization of non-Gaussianity. The dependence of inflationary observables on the parameter cs is considered in the leading order slow roll approximation. The results show that in most cases the dependence is actually rather weak for the range of cs allowed by existing bounds on non-Gaussianity.

Citations

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