22 papers
The Magnetic Origin of Primordial Black Holes: A Viable Dark Matter Scenario
Subhasis Maiti, Debaprasad Maity
Primordial Black Holes (PBHs) are compelling candidates for explaining the present-day relic abundance of cold dark matter (CDM), yet their formation typically requires finely tune…
Inflaton Accretion onto Primordial Black Holes During Reheating
Jitumani Kalita, Debaprasad Maity
Primordial Black Holes (PBHs) forming prior to Big Bang Nucleosynthesis evolve during the reheating epoch, an environment dominated by an oscillating inflaton field decaying into a…
The Magnetic Origin of Primordial Black Holes: Ultralight PBHs and Secondary GWs
Subhasis Maiti, Debaprasad Maity
Ultralight primordial black holes (PBHs) provide a compelling window into early-Universe cosmology. Following our earlier work, we explore a mechanism for the formation of ultralig…
Evaporation of Primordial Black Holes in a Thermal Universe: A Thermofield Dynamics Approach
Ayan Chatterjee, Jitumani Kalita, Debaprasad Maity
We investigate the impact of a finite temperature environment on the Hawking radiation from black holes (BHs), with particular focus on Kerr BHs immersed in a cosmological thermal…
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…
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 e…