2020/11/04 by Debasish Borah, Borah, Debasish, Suruj Jyoti Das +3 · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2011.02489
openalex publication_date 2020/11/04 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
We propose a minimal framework to address successful quartic inflation, dark\nmatter (DM) production in the early universe and non-vanishing tiny Majorana\nneutrino mass from a common gravitational origin point of view. In this setup,\nthe quartic inflation is revived successfully via non-minimal coupling of\ninflaton to gravity while the production of DM takes place from purely\ngravitational effects through a misalignment mechanism. The generation of light\nMajorana neutrino mass is aided by explicit breaking of global lepton number\nsymmetry through Planck suppressed operators involving non-zero vacuum\nexpectation value (VEV) of the inflaton field. We present a detailed study of\nthe DM yield in presence of non-minimal inflation, considering both the metric\nand the Palatini formalisms of gravity wherever appropriate. We reach at some\ninteresting and different results in the DM sector compared to the earlier\nworks in the similar direction with minimal inflationary background.\nRestricting to the light DM regime (\O(1) keV- \O(100)\nMeV) where classical production is expected to dominate over the quantum\nproduction, we numerically predict the DM mass by varying the DM quartic and\nnon-minimal coupling, to be consistent with relic density requirements. We also\nobtain some non-trivial dependence of DM phenomenology on some of the relevant\nparameters of the inflation sector it e.g. non minimal coupling and inflaton\nVEV. To explore the dependence on inflationary parameters further, we also\nestimate the DM relic using the same mechanism for two other inflationary\nmodels consistent with latest data and observe that one of these models\npredicts different range of DM mass upto hundreds of TeV.\n