2024/12/15 by Iraj Safaei, Soma Heydari, Safaei, Iraj +5
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #High Energy Physics - Theory (hep-th) #Solar and Space Plasma Dynamics
paper · pdf · doi:10.48550/arxiv.2412.12203
openalex publication_date 2024/12/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Here, a single field inflationary model driven by a mutated hilltop potential, a subclass of the hilltop models of inflation, is investigated. To constrain the parameter space, we employ the latest r-n\rm s constraints from Planck 2018, BICEP/Keck 2018, and the Atacama Cosmology Telescope (ACT) data, alongside reheating parameters N_\rmre, T_\rmre, and ω_\rmre, and the model independent bound on the radiation dominated (RD) era N_\rmrd. Furthermore, the relic gravitational wave (GW) spectrum within the sensitivity domains of future GW detectors are analyzed. By combining CMB, reheating, RD era, and GW constraints, we find for the Planck+BK18 data that the inflationary duration is confined to 46 ≤ N ≤ 56 (95% CL) and 48.1 ≤ N ≤ 56 (68% CL). Moreover, the model parameter α is confined to 0.161 ≤ α≤ 0.890 (95% CL) and 0.217 ≤ α≤ 0.815 (68% CL). Inclusion of the ACT data further tighten the constraints to 54 ≤ N ≤ 56 (95% CL) and 0.29 ≤ α≤ 0.62 (95% CL), thereby enhancing the precision and robustness of the model predictions.