Publication: Generic slow-roll and non-gaussianity parameters in f(R) theories
Дата
2019
Авторы
Miranda, T.
Escamilla-Rivera, C.
Piattella, O. F.
Fabris, J. C.
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Аннотация
© 2019 IOP Publishing Ltd and Sissa Medialab.In this paper we establish formulae for the inflationary slow-roll parameters ϵ, η and ζ as functions of the Ricci scalar R for f(R) theories of gravity. As examples, we present the analytic and numerical solutions of ϵ, η and ζ as functions of the number of e-folds N in two important instances: for the Starobinsky model and for a f(R) reconstruction of the α-Attractors. The highlight of our proposal is to rewrite the slow-roll parameters in terms of f(R), which allows to find directly ns, r, αs and fequil NL as functions of R itself. We obtain that both models indicate a small contribution to the non-Gaussianity parameters, which are in good agreement with current observational constraints.
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Цитирование
Generic slow-roll and non-gaussianity parameters in f(R) theories / Miranda, T. [et al.] // Journal of Cosmology and Astroparticle Physics. - 2019. - 2019. - № 5. - 10.1088/1475-7516/2019/05/028
URI
https://www.doi.org/10.1088/1475-7516/2019/05/028
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https://www.scopus.com/record/display.uri?eid=2-s2.0-85069665360&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000468322600001
https://openrepository.mephi.ru/handle/123456789/18473