Inflaton phenomenology via reheating in light of primordial gravitational waves and the latest BICEP/$Keck$ data

Abstract

We are in the era of precision cosmology which offers us a unique opportunity to investigate beyond standard model physics. Toward this endeavor, inflaton is assumed to be a perfect new physics candidate. In this submission, we explore the phenomenological impact of the latest observation of PLANCK and BICEP/$Keck$ data on the physics of inflation. We particularly study three different models of inflation, namely $\alpha$-attractor E, T, and the minimal plateau model. We further consider two different post-inflationary reheating dynamics driven by inflaton decaying into bosons and fermions. Given the latest data in the inflationary $(n_s-r)$ plane, we derive detailed phenomenological constraints on different inflaton parameters and the associated physical quantities, such as inflationary $e$-folding number, $N_k$, reheating temperatures $T_{\mathrm{re}}$. Apart from considering direct observational data, we further incorporate the bounds from primordial gravitational waves (PGWs) and different theoretical constraints. Rather than in the laboratory, our results illustrate the potential of present and future cosmological observations to look for new physics in the sky.

18 pages, 8 tables and 12 figures

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• Decoding the phases of early and late time reheating through imprints on primordial gravitational waves
• CMB constraints on the inflaton couplings and reheating temperature in $\alpha$-attractor inflation
• Gravitational reheating
• BICEP/Keck Constraints on Attractor Models of Inflation and Reheating
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• Enhanced primordial gravitational waves from a stiff post-inflationary era due to an oscillating inflaton
• Constraining the history of reheating with the NANOGrav 15-year data
• Thermal and nonthermal dark matters with gravitational neutrino reheating
• Reheating and Leptogenesis after Vector inflation
• Freeze-in and freeze-out production of Higgs portal Majorana fermionic dark matter during and after reheating
• Post-inflationary production of particle Dark Matter: Hilltop and Coleman-Weinberg inflation
• ACT DR6 Insights on the Inflationary Attractor models and Reheating
• Axion Dark Matter Archaeology with Primordial Gravitational Waves
• Hamilton-Jacobi analysis of noncanonical inflation in $f(R,T)$ gravity: Constraints from Planck/ACT data, and theoretical bounds
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