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• W2416860305 abstract "We revisit the inflationary dynamics in detail for theories with Gauss-Bonnet gravity coupled to scalar functions, in light of the Planck data. Considering the chaotic inflationary scenario, we constrain the parameters of two models involving inflaton-Gauss-Bonnet coupling by current Planck data. For nonzero inflaton-Gauss-Bonnet coupling $ensuremath{beta}$, an inflationary analysis provides us a big cosmologically viable region in the space of ($m$, $ensuremath{beta}$), where $m$ is the mass of the inflaton. However, we study further on constraining $ensuremath{beta}$ arising from reheating considerations and unitarity of tree-level amplitude involving 2-graviton $ensuremath{rightarrow}2$-graviton ($hhensuremath{rightarrow}hh$) scattering. Our analysis, particularly on reheating significantly reduces the parameter space of ($m$, $ensuremath{beta}$) for all models. The quadratic Gauss-Bonnet coupling parameter turns out to be more strongly constrained than that of the linear coupling. For the linear Gauss-Bonnet coupling function, we obtain $ensuremath{beta}ensuremath{lesssim}1{0}^{3}$, with the condition $ensuremath{beta}(m/{M}_{P}{)}^{2}ensuremath{simeq}{10}^{ensuremath{-}4}$. However, the study of the Higgs inflation scenario in the presence of a Gauss-Bonnet term turns out to be completely disfavored." @default.
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• W2416860305 date "2017-01-23" @default.
• W2416860305 modified "2023-10-16" @default.
• W2416860305 title "Constraining scalar-Gauss-Bonnet inflation by reheating, unitarity, and Planck data" @default.
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• W2416860305 doi "https://doi.org/10.1103/physrevd.95.023514" @default.
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