A bstract The Standard Model, extended with three right-handed (RH) neutrinos, is the
simplest model that can explain light neutrino masses, the baryon asymmetry of the …

We explore the possibility of probing freeze-in dark matter (DM) produced via the right-
handed neutrino (RHN) portal using the RHN search experiments. We focus on a simplified …

With entropy injection, an early matter-dominated epoch (EMD) impels the axion decay
constant fa toward larger values to produce correct axion dark matter (DM) abundance …

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 …

Sterile neutrinos (ν s) that mix with active neutrinos (ν a) are interesting dark matter
candidates with a rich cosmological and astrophysical phenomenology. In their simplest …

We investigate the structure of admixed neutron stars with a regular hadronic component
and a fraction of fermionic self-interacting dark matter. Using two limiting equations of state …

We study the possibility of testing a dark matter (DM) scenario embedded in a global lepton
number symmetry U (1) L via gravitational waves (GWs) and cosmic microwave background …

We propose a new production mechanism for keV sterile neutrino dark matter which relies
neither on the oscillations between sterile and active neutrinos nor on the decay of …

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 …

We explore the phenomenological consequences of breaking discrete global symmetries in
quantum gravity (QG). We extend a previous scenario where discrete global symmetries are …