Adiabatic And Entropy Perturations In Inflationary Models Based On Non-linear Sigma Model

Details Adiabatic And Entropy Perturations In Inflationary Models Based On Non-linear Sigma Model Adiabatic And Entropy Perturations In Inflationary Models Based On Non-linear Sigma Model

2005-01-27

arxiv.org/abs/astro-ph/0501600v1

Grav.Cosmol. 10 (2004) 289-294

Astronomy and Astrophysics

Astrophysics

6 pages, 2 Postscript figures, accepted for publications by Grav.& Cosmol

Scientific paper

The scalar perturbations in inflationary models, based on a two-component diagonal non-linear sigma model, are considered. For inhomogeneities generated at an inflationary stage, the law of motion of the comoving curvature ${\cal R}$ is obtained (without using the slow roll approximations). A formal expressions for the power spectrum and its spectral index are obtained, which are valid and after the slow-roll stage. As an example, an inflationary model with a massive scalar field and quadratic curvature corrections is studied numerically.

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