Many symmetry breaking patterns in grand unified theories (GUTs) give rise to cosmic
strings that eventually decay when pairs of GUT monopoles spontaneously nucleate along …

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 …

A bstract We explore a variety of composite topological structures that arise from the
spontaneous breaking of SO (10) to SU (3) c× U (1) em via one of its maximal subgroups SU …

We investigate the inflationary cosmology involving an SU (5) GUT (grand unified theory)
singlet scalar with nonminimal coupling to the Ricci scalar. In this scenario the scale of …

We explore the gravitational wave spectrum generated by string-wall structures in an SO
(10)(S pin (10)) based scenario of pseudo-Goldstone boson dark matter (pGDM) particle …

We study stochastic gravitational waves from cosmic strings generated in an ultraviolet-
complete model for pseudo-Nambu-Goldstone dark matter with a hidden ${U (1)} $ gauge …

A bstract Motivated by the direct discovery of gravitational waves (GWs) from black holes
and neutron stars, there is a growing interest in investigating GWs from other sources …

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 …

Recently, it has been shown that the presence of a noninstantaneous era of reheating can
significantly alter the charged lepton (s) equilibration temperature (s) which plays an …

A bstract We present an SO (10) model in which a dimension five operator induces kinetic
mixing at the GUT scale between the abelian subgroups U (1) B− L and U (1) R. We discuss …