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Higgs inflation in metric and Palatini formalisms: required suppression of higher dimensional operators

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Title
Higgs inflation in metric and Palatini formalisms: required suppression of higher dimensional operators
Author(s)
Ryusuke Jinno; Mio Kubota; Kin-ya Oda; Seong Chan Park
Subject
cosmology of theories beyond the SM, ; inflation, ; particle physics - cosmology connection
Publication Date
2020-03
Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v.2020, no.3, pp.063
Publisher
IOP PUBLISHING LTD
Abstract
© 2020 IOP Publishing Ltd and Sissa Medialab. We investigate the sensitivity of Higgs(-like) inflation to higher dimensional operators in the nonminimal couplings and in the potential, both in the metric and Palatini formalisms. We find that, while inflationary predictions are relatively stable against the higher dimensional operators around the attractor point in the metric formalism, they are extremely sensitive in the Palatini one: for the latter, inflationary predictions are spoiled by vertical bar xi(4)vertical bar greater than or similar to 10(-6) in the nonminimal couplings (xi(2)phi(2) + xi(4)phi(4) + ...) R, or by vertical bar lambda(6)vertical bar greater than or similar to 10(-16) in the Jordan-frame potential lambda(4)phi(4) + lambda(6)phi(6) + ... (both in Planck units). This extreme sensitivity results from the absence of attractor in the Palatini formalism. Our study underscores the challenge of realizing inflationary models with the nonminimal coupling in the Palatini formalism
URI
https://pr.ibs.re.kr/handle/8788114/8710
DOI
10.1088/1475-7516/2020/03/063
ISSN
1475-7516
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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