A century ago, Einstein formulated his elegant and elaborate theory of General Relativity,
which has so far withstood a multitude of empirical tests with remarkable success …

In this paper, we review in detail different mechanisms of generation of large primordial
fluctuations and their implications for the production of primordial black holes (PBHs) and …

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 review recent progress in the construction of modified gravity models as alternatives to
dark energy as well as the development of cosmological tests of gravity. Einstein's theory of …

In this review we present a thoroughly comprehensive survey of recent work on modified
theories of gravity and their cosmological consequences. Amongst other things, we cover …

We study generalized Galileons as a framework to develop the most general single-field
inflation models ever, Generalized G-inflation, containing yet further generalization of G …

The gravitational wave (GW) event GW170817 from a binary neutron star merger together
with the electromagnetic counterpart showed that the speed of GWs ct is very close to that of …

We consider the production of secondary gravity waves in Galileon inflation with an ultra-
slow roll (USR) phase and show that the spectrum of scalar-induced gravitational waves …

We introduce a large class of scalar-tensor models with interactions containing the second
derivatives of the scalar field but not leading to additional degrees of freedom. These models …