ACT DR6 Insights on the Inflationary Attractor models and Reheating
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| Formato: | Preprint |
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2025
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| author | Haque, Md Riajul Pal, Sourav Paul, Debarun |
| author_facet | Haque, Md Riajul Pal, Sourav Paul, Debarun |
| contents | We investigate the observational constraints on $α$-attractor inflationary models and their post-inflationary reheating dynamics in light of the latest CMB data from ACT DR6 combined with Planck18, BICEP/$Keck$ 2018, and DESI (collectively denoted P-ACT-LB-BK18). Focusing on both E and T type attractor potentials, we analyze how inflationary observables namely the scalar spectral index $n_s$ and the tensor-to-scalar ratio $r$ are indirectly influenced by reheating parameters such as the reheating temperature $T_{\text{RH}}$, the inflaton equation-of-state $w_ϕ$, and the inflaton's couplings to Starndard Model particles. We incorporate indirect constraints from the overproduction of primordial gravitational waves (PGWs), particularly via $ΔN_{\rm eff}$ bounds on BBN, which become significant for stiff post-inflationary dynamics. Our results show that E-models permit a wide range of reheating scenarios, including matter-like reheating ($w_ϕ= 0$), while T-models are viable only for $w_ϕ\gtrsim 0.44$. We derive bounds on inflaton-Standard Model couplings for both decay and scattering channels and identify parameter regimes compatible with recent ACT data for successful reheating. These findings establish a robust connection between inflationary theory, thermal history, and particle phenomenology, and provide predictive targets for future CMB missions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_01517 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | ACT DR6 Insights on the Inflationary Attractor models and Reheating Haque, Md Riajul Pal, Sourav Paul, Debarun Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory We investigate the observational constraints on $α$-attractor inflationary models and their post-inflationary reheating dynamics in light of the latest CMB data from ACT DR6 combined with Planck18, BICEP/$Keck$ 2018, and DESI (collectively denoted P-ACT-LB-BK18). Focusing on both E and T type attractor potentials, we analyze how inflationary observables namely the scalar spectral index $n_s$ and the tensor-to-scalar ratio $r$ are indirectly influenced by reheating parameters such as the reheating temperature $T_{\text{RH}}$, the inflaton equation-of-state $w_ϕ$, and the inflaton's couplings to Starndard Model particles. We incorporate indirect constraints from the overproduction of primordial gravitational waves (PGWs), particularly via $ΔN_{\rm eff}$ bounds on BBN, which become significant for stiff post-inflationary dynamics. Our results show that E-models permit a wide range of reheating scenarios, including matter-like reheating ($w_ϕ= 0$), while T-models are viable only for $w_ϕ\gtrsim 0.44$. We derive bounds on inflaton-Standard Model couplings for both decay and scattering channels and identify parameter regimes compatible with recent ACT data for successful reheating. These findings establish a robust connection between inflationary theory, thermal history, and particle phenomenology, and provide predictive targets for future CMB missions. |
| title | ACT DR6 Insights on the Inflationary Attractor models and Reheating |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2505.01517 |