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Basabendu Barman

As seen in: Physical Review B
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Articles

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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