We provide a review on the state-of-the-art of gravitational waves induced by primordial
fluctuations, so-called induced gravitational waves. We present the intuitive physics behind …

The pulsar timing array (PTA) collaborations have recently suggested the presence of a
gravitational wave background at nano-Hertz frequencies. In this paper, we explore potential …

The recently released data by pulsar timing array (PTA) collaborations have amassed
substantial evidence corroborating the existence of a stochastic signal consistent with a …

The power-law parametrization for the energy density spectrum of gravitational wave (GW)
background is a useful tool to study its physics and origin. While scalar induced secondary …

The stochastic signal detected by NANOGrav, PPTA, EPTA, and CPTA can be explained by
the scalar-induced gravitational waves. In order to determine the scalar-induced …

Primordial black holes formed in the early Universe via gravitational collapse of over-dense
regions may contribute a significant amount to the present dark matter relic density. Inflation …

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

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

Recently released data from pulsar timing array (PTA) collaborations provide strong
evidence for a stochastic signal consistent with a gravitational-wave background, potentially …

We improve and generalize the non-minimal curvaton model originally proposed in arxiv:
2112.12680 to a model in which a spectator field non-minimally couples to an inflaton field …