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

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 …

In the summer of 2023, the pulsar timing arrays (PTAs) announced a compelling evidence
for the existence of a nanohertz stochastic gravitational wave background (SGWB). Despite …

Pulsar timing arrays (PTAs) have revealed galaxy-size gravitational waves (GWs) in the form
of a stochastic gravitational wave background (SGWB), correlating the radio pulses emitted …

We investigate the scalar induced gravitational waves (SIGWs) in metric teleparallel gravity
with the Nieh-Yan (NY) term, which results in parity violation during the radiation-dominated …

We study secondary gravitational wave production in Horndeski gravity when the scalar field
dominates the very early universe. We find that higher derivative interactions easily …

With the strong evidence for a gravitational wave (GW) background in the nanohertz
frequency band from pulsar timing arrays, the detection of continuous GWs from individual …

The North American Nanohertz Observatory for Gravitational Waves (NANOGrav)
collaboration has recently reported strong evidence for a signal at nanohertz, potentially the …

We investigate whether the Pre-Big Bang (PBB) scenario from string cosmology can explain
the stochastic gravitational wave background signal reported in the NANOGrav 15-year …

The recently reported signal of common red noise between pulsars by several pulsar timing
array collaborations has been thought as evidence of the stochastic gravitational wave …