299 citations · 868 across the 43 of their papers we have counts for
7 papers · 1 filter
Leptogenesis with a GeV-Scale Quasi-Dirac Neutrino
Stephen F. King, Soumen Kumar Manna, Rishav Roshan +1
We discuss leptogenesis in a model with a GeV-scale quasi-Dirac neutral lepton, comprising mainly sterile states, which is accessible to future experiments. In particular, we show…
Cosmological Consequences of a Highly Decoupled Right-handed Neutrino
Stephen F. King, Rishav Roshan, Sudipta Show
In the minimal type-I seesaw, one right-handed neutrino (RHN) can decouple from neutrino mass generation. Such a state is usually neglected, yet its feeble couplings make it long-l…
Minimal Scale-Invariant Dark Matter
Alexander Belyaev, Roman Pasechnik, Rishav Roshan +1
We study the minimal classically scale-invariant extension of the Standard Model, containing a single -stabilised real scalar singlet whose mass is not an independent…
Particle and Gravitational Wave Probes of Minimal Seesaw Neutrinos
Sanjoy Mandal, Rishav Roshan, Jose W. F. Valle
Observable gravitational waves (GWs) from first-order phase transitions (FOPTs) can coexist with distinct particle physics signatures. These include same-sign dilepton plus four~je…
Imprint of domain wall annihilation on induced gravitational waves
Rishav Roshan
Domain wall annihilation can leave a distinctive imprint on the induced gravitational wave spectrum. During annihilation, most of the domain wall energy transforms into the scalar…
Reheating Effects on Charged Lepton Yukawa Equilibration and Leptogenesis
Rishav Roshan
We show that accounting for a non-instantaneous reheating phase after inflation can significantly modify the charged lepton Yukawa equilibration temperature in the early Universe.…
Twin-peaked gravitational wave signals from a phase transition
Rishav Roshan, Indrajit Saha
We compute the gravitational wave spectrum from a phase transition associated with the spontaneous breaking of a symmetry. If the transition is second-orde…