Observational constraints on mutated hilltop inflation
Iraj Safaei, Soma Heydari, Milad Solbi, Kayoomars Karami
arXiv:2412.12203v1 Announce Type: new
Abstract: Here, a single field inflationary model driven by a mutated hilltop potential, as a subclass of the hilltop models of inflation, is investigated. In order to constrain the parameter space of the model, the $r-n_{rm s}$ constraint of Planck and BICEP/Keck 2018 data as well as the reheating parameters such as the duration $N_{rm{re}}$, the temperature $T_{rm{re}}$, and the equation of state parameter $omega_{rm{re}}$, are employed. In addition, a model independent bound on the duration of the radiation dominated (RD) era $N_{rm{rd}}$ is applied to improve the parameter space. Furthermore, the density spectra of relic gravitational waves (GWs) in light of the sensitivity domains of GW detectors, for specific inflationary durations $N$, are analyzed. Finally, by combining constraints from the cosmic microwave background (CMB), reheating, RD era, and relic GWs, the permissible inflationary duration is constrained to $46leq N leq 56$ (95% CL) and $48.1leq Nleq 56$ (68% CL). Moreover, the model parameter $alpha$ is confined to $0.161leqalpha leq 0.890$ (95% CL) and $0.217leqalpha leq 0.815$ (68% CL).arXiv:2412.12203v1 Announce Type: new
Abstract: Here, a single field inflationary model driven by a mutated hilltop potential, as a subclass of the hilltop models of inflation, is investigated. In order to constrain the parameter space of the model, the $r-n_{rm s}$ constraint of Planck and BICEP/Keck 2018 data as well as the reheating parameters such as the duration $N_{rm{re}}$, the temperature $T_{rm{re}}$, and the equation of state parameter $omega_{rm{re}}$, are employed. In addition, a model independent bound on the duration of the radiation dominated (RD) era $N_{rm{rd}}$ is applied to improve the parameter space. Furthermore, the density spectra of relic gravitational waves (GWs) in light of the sensitivity domains of GW detectors, for specific inflationary durations $N$, are analyzed. Finally, by combining constraints from the cosmic microwave background (CMB), reheating, RD era, and relic GWs, the permissible inflationary duration is constrained to $46leq N leq 56$ (95% CL) and $48.1leq Nleq 56$ (68% CL). Moreover, the model parameter $alpha$ is confined to $0.161leqalpha leq 0.890$ (95% CL) and $0.217leqalpha leq 0.815$ (68% CL).