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Basabendu Barman

As seen in: Physical Review B
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Articles by Basabendu Barman

Leptogenesis, primordial gravitational waves, and PBH-induced reheating

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By Basabendu Barman, SRM University-AP, Suruj Jyoti Das, Riajul Haque
| Physical Review B
We explore the possibility of producing the observed matter-antimatter asymmetry of the Universe uniquely from the evaporation of primordial black holes (PBHs) that are formed in an inflaton-dominated background. Considering the inflaton (ϕ) to oscillate in a monomial potential V(ϕ)∝ϕn, we show, it is possible to obtain the desired baryon asymmetry via vanilla leptogenesis from evaporating PBHs of initial mass ≲10  g.
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Testing axionic dark matter during gravitational reheating

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By Basabendu Barman, Arghyajit Datta
| Physical Review B
Assuming axions are potential dark matter (DM) candidate that make up all of the DM abundance, we discuss production of axions via (i) standard misalignment mechanism during the period of reheating and (ii) graviton-mediated 2-to-2 scattering of the inflaton and bath particles, where the inflaton ϕ oscillates in a monomial potential V(ϕ)∝ϕk with a general equation of state.
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Bremsstrahlung-induced gravitational waves in monomial potentials during reheating

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By Basabendu Barman, Nicolas Alvarez Bernal, Nicolás Bernal, Abu Dhabi, Saadiyat Island
| Physical Review B
We discuss the production of primordial gravitational waves (GW) from radiative inflaton decay during the period of reheating, assuming perturbative decay of the inflaton either into a pair of bosons or fermions, leading to successful reheating satisfying constraint from big bang nucleosynthesis.
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Probing freeze-in dark matter via heavy neutrino portal

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By Basabendu Barman, Centro de Investigaciones, Universidad Antonio Nariño, Anish Ghoshal
| Physical Review B
We explore the possibility of probing freeze-in dark matter (DM) produced via the right-handed neutrino (RHN) portal using the RHN search experiments. We focus on a simplified framework of minimally-extended type-I seesaw model consisting of only four free parameters, namely the RHN mass, the fermionic DM mass, the Yukawa coupling between the DM and the RHN, and a real singlet scalar mass.
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Gravitational wave signatures of a PBH-generated baryon-dark matter coincidence

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By Debasish Borah, Suruj Jyoti Das, Rishav Roshan, Basabendu Barman
| Physical Review B
Abstract We propose a new way of probing the nonthermal origin of baryon asymmetry of the Universe (BAU) and dark matter (DM) from evaporating primordial black holes (PBHs) via stochastic gravitational waves (GWs) emitted due to PBH density fluctuations. We adopt a baryogenesis setup where CP-violating out-of-equilibrium decays of a colored scalar, produced nonthermally at late epochs from PBH evaporation, lead to the generation of BAU.
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