ACT inflation and its influence on reheating era in Einstein-Gauss-Bonnet gravity
Abstract
We investigate the observational viability of non-minimally coupled scalar-Einstein-Gauss-Bonnet (GB) gravity, during inflation and post-inflationary reheating dynamics, from the perspective of the latest ACT-DR6 combined with the Planck 2018 and BAO data. It turns out that the ACT result considerably affects the inflationary e-fold number compared to the case where only Planck 2018 data is taken into account. The viable parameter spaces corresponding to the inflationary ACT-DR6+Planck18+BAO substantially influence the reheating phenomenology via the reheating equation of state () and the reheating temperature. In particular, the ACT-DR6+Planck18+BAO data seems to disfavor during the reheating stage, which is unlike to that of only Planck 2018 case. These reveal how the ACT-DR6 data hits the early universe phenomenology from inflation to reheating in the context of higher curvature like scalar-Einstein-GB theory of gravity.
Cite
@article{arxiv.2508.11377,
title = {ACT inflation and its influence on reheating era in Einstein-Gauss-Bonnet gravity},
author = {Sergei D. Odintsov and Tanmoy Paul},
journal= {arXiv preprint arXiv:2508.11377},
year = {2025}
}
Comments
PLB Accepted