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Suruj Jyoti Das on Muck Rack

Suruj Jyoti Das

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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Thermalized dark radiation in the presence of a PBH: $\mathrm{\ensuremath{\Delta}}{\mathrm{N}}_{\mathrm{eff}}$ and gravitational waves complementarity

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By Nayan Das, Suruj Jyoti Das, Debasish Borah
| Physical Review B
We study the possibility of detecting dark radiation (DR) produced by a combination of interactions with the thermal bath and ultralight primordial black hole (PBH) evaporation in the early Universe. We show that the detection prospects via cosmic microwave background (CMB) measurements of the effective relativistic degrees of freedom ΔNeff get enhanced in some part of the parameter space compared to the purely nonthermal case where DR is produced solely from a PBH.
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Baryon asymmetry from dark matter decay

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By Debasish Borah, Suruj Jyoti Das, Rishav Roshan
| Physical Review B
We propose a novel framework where baryon asymmetry can arise due to forbidden decay of dark matter (DM) enabled by finite-temperature effects in the early Universe. In order to implement it in a realistic setup, we consider the DM to be a singlet Dirac fermion that acquires a dark asymmetry from a scalar field Φ via the Affleck-Dine mechanism.
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