Detection of a gravitational-wave signal of non-astrophysical origin would be a landmark
discovery, potentially providing a significant clue to some of our most basic, big-picture …

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 …

The symmetry breaking of grand unified gauge groups in the early Universe often leaves
behind relic topological defects such as cosmic strings, domain walls, or monopoles. For …

A metastable cosmic-string network is a generic consequence of many grand unified
theories (GUTs) when combined with cosmic inflation. Metastable cosmic strings are not …

It has recently been pointed out that Gaia is capable of detecting a stochastic gravitational
wave background in the sensitivity band between the frequency of pulsar timing arrays and …

Motivated by the NANOGrav 15 year data and other recent investigations of stochastic
gravitational background radiation based on pulsar timing arrays, we show how superheavy …

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 …

Abstract We search NANOGrav's 12.5 yr data set for evidence of a gravitational-wave
background (GWB) with all the spatial correlations allowed by general metric theories of …

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 …

A bstract Grand Unified Theories (GUT) predict proton decay as well as the formation of
cosmic strings which can generate gravitational waves. We determine which non …