Gravitational wave signatures of a PBH-generated baryon-dark matter coincidence

B Barman, D Borah, SJ Das, R Roshan - Physical Review D, 2023 - APS
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 …

Non-thermal origin of asymmetric dark matter from inflaton and primordial black holes

B Barman, D Borah, SJ Das… - Journal of Cosmology and …, 2022 - iopscience.iop.org
We study the possibility of cogenesis of baryon and dark matter (DM) from the out-of-
equilibrium CP violating decay of right handed neutrino (RHN) that are dominantly of non …

Using gravitational waves to see the first second of the Universe

R Roshan, G White - arXiv preprint arXiv:2401.04388, 2024 - arxiv.org
Gravitational waves are a unique probe of the early Universe, as the Universe is transparent
to gravitational radiation right back to the beginning. In this article, we summarise detection …

Asymmetric self-interacting dark matter with a canonical seesaw model

D Borah, S Mahapatra, PK Paul, N Sahu, P Shukla - Physical Review D, 2024 - APS
We study the possibility of generating dark matter (DM) and baryon asymmetry of the
Universe (BAU) simultaneously in an asymmetric DM framework, which also alleviates the …

Nonthermal leptogenesis and UV freeze-in of dark matter: Impact of inflationary reheating

B Barman, D Borah, R Roshan - Physical Review D, 2021 - APS
We study a minimal scenario to realize nonthermal leptogenesis and UV freeze-in of a
Standard Model (SM) gauge singlet fermionic dark matter (DM) simultaneously, with inflaton …

Spontaneous leptogenesis with sub-GeV axionlike particles

A Datta, SK Manna, A Sil - Physical Review D, 2024 - APS
A derivative coupling of an axionlike particle (ALP) with a BL current may lead to the baryon
asymmetry of the Universe via spontaneous leptogenesis provided a lepton number …

Symmetry origin of baryon asymmetry, dark matter, and neutrino mass

S Bhattacharya, A Sil, R Roshan, D Vatsyayan - Physical Review D, 2022 - APS
We propose a minimal model based on lepton number symmetry (and violation), to address
a common origin of baryon asymmetry, dark matter and neutrino mass generation. The …

Two-component doublet-triplet scalar dark matter stabilizing the electroweak vacuum

N Chakrabarty, R Roshan, A Sil - Physical Review D, 2022 - APS
A two-component scalar dark matter scenario comprising an additional scalar doublet and a
Y= 0 scalar triplet is proposed. Key features of the ensuing dark matter phenomenology are …

Baryon asymmetry from dark matter decay in the vicinity of a phase transition

D Borah, A Dasgupta, M Knauss, I Saha - Physical Review D, 2023 - APS
We propose a novel framework where baryon asymmetry of the Universe can arise due to
forbidden decay of dark matter (DM) enabled by finite-temperature effects in the vicinity of a …

Freeze-in dark matter through forbidden channel in U (1) BL

P Konar, R Roshan, S Show - Journal of Cosmology and …, 2022 - iopscience.iop.org
We examine a scenario for freeze-in production of dark matter, which occurs due to the large
thermal correction to the mass of a decaying mediator particle present in the thermal bath of …