Large field polynomial inflation in Palatini f(R, ϕ) gravity

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dc.authorid0000-0002-1129-4345
dc.authorid0000-0003-1218-0451
dc.authorid0000-0002-1014-3633
dc.contributor.authorBostan, Nilay
dc.contributor.authorKarahan, Canan
dc.contributor.authorSargın, Ozan
dc.date.accessioned2025-03-04T06:26:29Z
dc.date.available2025-03-04T06:26:29Z
dc.date.issued2025-01-28
dc.departmentTENMAK-Nükleer Enerji Araştırma Enstitüsü-Ankara
dc.description.abstractIn this paper, we employ the Palatini formalism to investigate the dynamics of large-field inflation using a renormalizable polynomial inflaton potential in the context of f(R, ϕ) gravity. Assuming instant reheating, we make a comparative analysis of large-field polynomial inflation (PI). We first consider the minimal and non-minimal coupling of inflaton in R gravity, and then we continue with the minimally and non-minimally coupled inflaton in f(R, ϕ) gravity. We scan the parameter space for the inflationary predictions (ns and r) consistent with the Planck and BICEP/Keck 2018 results as well as the sensitivity forecast of the future CMB-S4 and depict the compliant regions in the ϕ0 − β plane where ϕ0 and β are two parameters of polynomial inflation model which control the saddle point of the potential and the flatness in the vicinity of this point respectively. We find that a substantial portion of the parameter space aligns with the observational data.
dc.identifier.doi10.1088/1475-7516/2025/01/115
dc.identifier.urihttps://kurumsalarsiv.tenmak.gov.tr/handle/20.500.12878/2074
dc.institutionauthorBostan, Nilay
dc.language.isoen
dc.publisherAn IOPBN and SISSA journal
dc.relation.journalJournal of Cosmology and Astroparticle Physics
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectinflation
dc.subjectmodified gravity
dc.titleLarge field polynomial inflation in Palatini f(R, ϕ) gravity
dc.typearticle
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