Adiabatic regularisation of power spectra in k -inflation

We look at the question posed by Parker et al. about the effect of UV regularisation on the power spectrum for inflation. Focusing on the slow-roll k-inflation, we show that up to second order in the Hubble and sound flow parameters, the adiabatic regularisation of such model leads to no difference...

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Bibliographic Details
Published inJournal of cosmology and astroparticle physics Vol. 2015; no. 6; p. 19
Main Authors Alinea, Allan L., Kubota, Takahiro, Nakanishi, Yukari, Naylor, Wade
Format Journal Article
LanguageEnglish
Published United States 01.06.2015
Subjects
ADIABATIC APPROXIMATION
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COSMOLOGICAL INFLATION
ENERGY SPECTRA
INFLATIONARY UNIVERSE
SCALE INVARIANCE
SOUND WAVES
ULTRAVIOLET RADIATION
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Summary:We look at the question posed by Parker et al. about the effect of UV regularisation on the power spectrum for inflation. Focusing on the slow-roll k-inflation, we show that up to second order in the Hubble and sound flow parameters, the adiabatic regularisation of such model leads to no difference in the power spectrum apart from certain cases that violate near scale-invariant power spectra. Furthermore, extending to non-minimal k-inflation, we establish the equivalence of the subtraction terms in the adiabatic regularisation of the power spectrum in Jordan and Einstein frames.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2015/06/019