3 papers
hep-ph2026
Dark matters are Inert, or FIMPy, or WIMPy or UFOy: An inflationary gravitational particle production
Ayan Chakraborty, Debaprasad Maity, Rajesh Mondal
In this letter, we explore the phenomenological impact of inflationary gravitational particle production in the physics of Dark Matter (DM). Large-scale DM fluctuations generated d…
astro-ph.CO2025
Nonminimal infrared gravitational reheating in light of ACT observation
Ayan Chakraborty, Debaprasad Maity, Rajesh Mondal
Inflation is known to produce large infrared scalar fluctuations. Further, if a scalar field is non-minimally coupled with gravity through , those infrared modes expe…
hep-ph2025
Freeze-in and freeze-out production of Higgs portal Majorana fermionic dark matter during and after reheating
Rajesh Mondal, Sourav Mondal, Toshifumi Yamada
In this paper, we investigate the production of Majorana fermionic dark matter (DM) via the Higgs portal, considering both freeze-in and freeze-out mechanisms during and after the…