Various pulsar timing array (PTA) experiments (NANOGrav, EPTA, PPTA, CPTA, including
data from InPTA) very recently reported evidence for excess red common-spectrum signals …

A bstract In recent years, several pulsar timing array collaborations have reported first hints
for a stochastic gravitational wave background at nano-Hertz frequencies. Here we …

We revisit the possibility that the stochastic common-spectrum process recently detected by
the NANOGrav pulsar timing array experiment could be due to primordial gravitational …

Composite topological structures such as superheavy “quasistable strings”(QSS) and “walls
bounded by strings”(WBS) arise in realistic extensions of the Standard Model of high energy …

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 …

The origin of interstellar and intergalactic magnetic fields remains largely unknown. One
possibility is that they are related to the primordial magnetic fields (PMFs) produced by, for …

The NANOGrav, Parkes, European, and International Pulsar Timing Array (PTA)
Collaborations have reported evidence for a common-spectrum process that can potentially …

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 …

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 …