The observed pattern of fermion masses and mixing is an outstanding puzzle in particle
physics, generally known as the flavor problem. Over the years, guided by precision neutrino …

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 …

We show that Majoron, the pseudo-Nambu-Goldstone boson resulting from the spontaneous
breaking of global lepton number symmetry, can present itself as a viable freeze-in type of …

If coupled feebly to the Standard Model bath, dark matter can evade the severe constraints
from the direct search experiments. At the same time, such interactions help produce dark …

The hybrid leptogenesis framework combining the type-I and type-II seesaw mechanisms for
neutrino mass necessarily include scattering topologies involving both the scalar triplet and …

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 …

We analyse a model that connects the neutrino sector and the dark sector of the universe via
a mediator $\Phi $, stabilised by a discrete $ Z_4 $ symmetry that breaks to a remnant $ Z_2 …

A bstract The observed dark matter relic abundance may be explained by different
mechanisms, such as thermal freeze-out/freeze-in, with one or more symmetric/asymmetric …

We investigate a simple variant of type-II seesaw, responsible for neutrino mass generation,
where the particle spectrum is extended with one singlet right-handed neutrino and an inert …