12 papers
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…
Boomerang mechanism explaining the excess radio background
Bhupal Dev, Pasquale Di Bari, Ivan Martinez-Soler +1
We propose a boomerang mechanism for the explanation of the excess radio background detected by ARCADE 2. In an early stage of the Universe, at a temperature in the range $\sim…
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 signal from a dark sector phase transition
Rishav Roshan, Indrajit Saha
We compute the gravitational wave spectrum from a dark sector phase transition driven by spontaneous $\ZDW$ breaking. If the transition is second-order, the only source of gravitat…