2020/10/16 by Ranajit Mandal, Dalia Saha, Mohosin Alam +1
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmological constant #Cosmology and Gravitation Theories #Curvature #Dark energy #Dilaton #Inflation (cosmology) #Inflationary epoch #Quantum gravity #Relativity and Gravitational Theory #Scalar (mathematics) #Universe #Vacuum energy #gr-qc #hep-th
paper · pdf · doi:10.1088/1361-6382/abc222
published as Class. Quantum Gravit. 38 (2021) 025001 · 26 pages, 4 figures. arXiv admin note: text overlap with arXiv:2004.04332
openalex publication_date 2020/10/16 · openalex created_date 2020/12/21 · arxiv created 2021/01/08 · arxiv updated 2021/01/11 · openalex updated_date 2026/08/05
Abstract We study the quantum evolution of the early Universe, its semi-classical analogue together with inflationary regime, in view of a generalized modified theory of gravity. The action is built by supplementing the non-minimally coupled scalar–tensor theory of gravity with scalar curvature squared term and a Gauss–Bonnet-dilatonic coupled term. It is generalized, since all the parameters are treated as arbitrary functions of the scalar field. It is interesting to explore the fact that instead of considering additional flow parameters, an effective potential serves the purpose of finding inflationary parameters. The dilaton stabilization issue appears here as a problem with reheating. Addition of a cosmological constant term alleviates the problem, and inflation is effectively driven by the vacuum energy density. Thus Gauss–Bonnet term might play a significant role in describing late-time cosmic evolution.