The cosmic acceleration problem remains one of the most significant challenges in
cosmology. One of the proposed solutions to this problem is the modification of gravity on …

The extreme-gravity collisions between black holes allow us to probe the underlying theory
of gravity. We apply a predictive forecast of the theory-agnostic inspiral–merger–ringdown …

We present a thorough stability analysis of modified gravity theories in the presence of
matter fields. We use the Effective Field Theory framework for Dark Energy and Modified …

We study the phenomenology of the beyond Horndeski class of scalar-tensor theories of
gravity, which on cosmological scales can be characterised in terms of one extra function of …

Neutron stars are ideal to probe, not only nuclear physics, but also strong-field gravity.
Approximate universal relations insensitive to the star's internal structure exist among certain …

We test the subclasses of Horndeski gravity without Vainshtein mechanism in the strong field
regime of binary pulsars. We find the rate of energy losses via the gravitational radiation …

We study the effects of Horndeski models of dark energy on the observables of the large-
scale structure in the late time universe. A novel classification into Late dark energy, Early …

We explore constraints on dark energy and modified gravity with forecasted 21cm intensity
mapping measurements using the Effective Field Theory approach. We construct a realistic …

Gravitational-wave sources can serve as standard sirens to probe cosmology by measuring
their luminosity distance and redshift. Such standard sirens are also useful to probe theories …

We investigate a new class of scalar multi-Galileon models, which is not included in the
commonly admitted general formulation of generalized multi-Galileons. The Lagrangians of …