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

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...

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Bibliographic Details
Published inJournal of cosmology and astroparticle physics Vol. 2014; no. 8; p. 24
Main Authors de Bruck, Carsten van, Robinson, Mathew
Format Journal Article
LanguageEnglish
Published United States 01.08.2014
Subjects
ACCURACY
APPROXIMATIONS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COSMOLOGICAL INFLATION
SPECTRA
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Summary: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.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2014/08/024