Gravitational waves (GWs) have a great potential to probe cosmology. We review early
universe sources that can lead to cosmological backgrounds of GWs. We begin by …

We review recent developments and results in testing general relativity (GR) at cosmological
scales. The subject has witnessed rapid growth during the last two decades with the aim of …

We consider Galileon inflation in the Effective Field Theory (EFT) framework and examine
the possibility for PBH formation during slow roll (SR) to ultra slow roll (USR) transitions. We …

After a decade and a half of research motivated by the accelerating universe, theory and
experiment have reached a certain level of maturity. The development of theoretical models …

We investigate the potential for the LISA space-based interferometer to detect the stochastic
gravitational wave background produced from different mechanisms during inflation …

We review recent progress in massive gravity. We start by showing how different theories of
massive gravity emerge from a higher-dimensional theory of general relativity, leading to the …

A bstract We study the imprints of massive particles with spin on cosmological correlators.
Using the framework of the effective field theory of inflation, we classify the couplings of …

This review is dedicated to recent progress in the field of classical, interacting, massive spin-
2 theories, with a focus on ghost-free bimetric theory. We will outline its history and its …

Hořava's proposal for non-relativistic quantum gravity introduces a preferred time foliation of
space-time which violates the local Lorentz invariance. The foliation is encoded in a …

We address the consistency of Hořava's proposal for a theory of quantum gravity from the
low-energy perspective. We uncover the additional scalar degree of freedom arising from …