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Title: Power spectra beyond the slow roll approximation in theories with non-canonical kinetic terms

Abstract

We derive analytical expressions for the power spectra at the end of inflation in theories with two inflaton fields and non-canonical kinetic terms. We find that going beyond the slow-roll approximation is necessary and that the nature of the non-canonical terms have an important impact on the final power spectra at the end of inflation. We study five models numerically and find excellent agreement with our analytical results. Our results emphasise the fact that going beyond the slow-roll approximation is important in times of high-precision data coming from cosmological observations.

Authors:
;  [1]
  1. Consortium for Fundamental Physics, School of Mathematics and Statistics, University of Sheffield, Hounsfield Road, Sheffeld, S3 7RH (United Kingdom)
Publication Date:
OSTI Identifier:
22373403
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; APPROXIMATIONS; COSMOLOGICAL INFLATION; SPECTRA

Citation Formats

De Bruck, Carsten van, and Robinson, Mathew, E-mail: C.vandeBruck@sheffield.ac.uk, E-mail: app11mrr@sheffield.ac.uk. Power spectra beyond the slow roll approximation in theories with non-canonical kinetic terms. United States: N. p., 2014. Web. doi:10.1088/1475-7516/2014/08/024.
De Bruck, Carsten van, & Robinson, Mathew, E-mail: C.vandeBruck@sheffield.ac.uk, E-mail: app11mrr@sheffield.ac.uk. Power spectra beyond the slow roll approximation in theories with non-canonical kinetic terms. United States. doi:10.1088/1475-7516/2014/08/024.
De Bruck, Carsten van, and Robinson, Mathew, E-mail: C.vandeBruck@sheffield.ac.uk, E-mail: app11mrr@sheffield.ac.uk. Fri . "Power spectra beyond the slow roll approximation in theories with non-canonical kinetic terms". United States. doi:10.1088/1475-7516/2014/08/024.
@article{osti_22373403,
title = {Power spectra beyond the slow roll approximation in theories with non-canonical kinetic terms},
author = {De Bruck, Carsten van and Robinson, Mathew, E-mail: C.vandeBruck@sheffield.ac.uk, E-mail: app11mrr@sheffield.ac.uk},
abstractNote = {We derive analytical expressions for the power spectra at the end of inflation in theories with two inflaton fields and non-canonical kinetic terms. We find that going beyond the slow-roll approximation is necessary and that the nature of the non-canonical terms have an important impact on the final power spectra at the end of inflation. We study five models numerically and find excellent agreement with our analytical results. Our results emphasise the fact that going beyond the slow-roll approximation is important in times of high-precision data coming from cosmological observations.},
doi = {10.1088/1475-7516/2014/08/024},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 08,
volume = 2014,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2014},
month = {Fri Aug 01 00:00:00 EDT 2014}
}