In this paper, which is of programmatic rather than quantitative nature, we aim to further
delineate and sharpen the future potential of the LISA mission in the area of fundamental …

This article is intended to review the recent developments in the Horndeski theory and its
generalization, which provide us with a systematic understanding of scalar–tensor theories …

Black hole spectroscopy is the program to measure the complex gravitational wave
frequencies of merger remnants, and to quantify their agreement with the characteristic …

Searching for violations of the no-hair theorem (NHT) is a powerful way to test gravity, and
more generally fundamental physics, particularly with regards to the existence of additional …

Gravitational waves (GWs) provide a new tool to probe the nature of dark energy (DE) and
the fundamental properties of gravity. We review the different ways in which GWs can be …

We study the nonlinear dynamics of black holes that carry scalar hair and binaries
composed of such black holes. The scalar hair is due to a linear or exponential coupling …

Cosmological observations are beginning to reach a level of precision that allows us to test
some of the most fundamental assumptions in our working model of the Universe. One such …

We study the nonlinear dynamics of binary black hole systems with scalar charge by
numerically evolving the full equations of motion for shift-symmetric Einstein scalar Gauss …

Linear perturbations of spherically symmetric spacetimes in general relativity are described
by radial wave equations, with potentials that depend on the spin of the perturbing field. In …

Pulsar timing arrays (PTA) are a promising probe to the cosmologically novel nanohertz
gravitational wave (GW) regime through the stochastic GW background. In this work, we …