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 …

Recently, several major pulsar timing array (PTA) collaborations have assembled strong
evidence for the existence of a gravitational-wave background at frequencies around the …

A series of pulsar timing arrays (PTAs) recently observed gravitational waves at the
nanohertz frequencies. Motivated by this remarkable result, we present a novel class of Pati …

The data recently released by the North American Nanohertz Observatory for Gravitational
Waves provides compelling evidence supporting the existence of a stochastic signal that …

In order to unravel the present situation of the PBH overproduction problem, our study
emphasizes the critical role played by the equation of state (EoS) parameter w within the …

The existence of a stochastic gravitational wave background is indicated by the recent
pulsar timing array (PTA) experiments. We study the enhanced production of second-order …

The bubbles that nucleated during slow-roll inflation can be supercritical, ie, their radii are
larger than the Hubble horizon of de Sitter spacetime inside the bubble (an inflating baby …

Recently, several regional pulsar timing array collaborations, including CPTA, EPTA, PPTA,
and NANOGrav, have individually reported compelling evidence for a stochastic signal at …

We discuss E 6 based extensions of the Standard Model (SM) containing two varieties of
superheavy metastable cosmic strings (CSs) that respectively have neutral and electrically …

A bstract Recently, evidence of stochastic gravitational wave background (SGWB) signals
observed by pulsar timing array (PTA) collaborations, has prompted investigations into their …