Constraining scalar-Gauss-Bonnet inflation by reheating, unitarity, and Planck data

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dc.contributor.author Bhattacharjee, Srijit
dc.contributor.author Sarkar, Sudipta
dc.date.accessioned 2017-07-26T07:57:11Z
dc.date.available 2017-07-26T07:57:11Z
dc.date.issued 2017-01
dc.identifier.citation Bhattacharjee, Srijit and Sarkar, Sudipta, “Constraining scalar-Gauss-Bonnet inflation by reheating, unitarity, and Planck data”, Physical Review D, DOI: 10.1103/PhysRevD.95.023514, vol. 95, no. 2, Jan. 2017. en_US
dc.identifier.issn 2470-0029
dc.identifier.issn 2470-0010
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/3043
dc.identifier.uri http://dx.doi.org/10.1103/PhysRevD.95.023514
dc.description.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 β , an inflationary analysis provides us a big cosmologically viable region in the space of ( m , β ), where m is the mass of the inflaton. However, we study further on constraining β arising from reheating considerations and unitarity of tree-level amplitude involving 2-graviton → 2 -graviton ( h h → h h ) scattering. Our analysis, particularly on reheating significantly reduces the parameter space of ( m , β ) 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 β ≲ 1 0 3 , with the condition β ( m / M P ) 2 ≃ 10 − 4 . However, the study of the Higgs inflation scenario in the presence of a Gauss-Bonnet term turns out to be completely disfavored. en_US
dc.description.statementofresponsibility by Srijit Bhattacharjee and Sudipta Sarkar
dc.format.extent Vol. 95, no. 2
dc.language.iso en_US en_US
dc.publisher American Physical Society en_US
dc.title Constraining scalar-Gauss-Bonnet inflation by reheating, unitarity, and Planck data en_US
dc.type Article en_US
dc.relation.journal Physical Review D


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