Abstract The Laser Interferometer Space Antenna (LISA) has two scientific objectives of
cosmological focus: to probe the expansion rate of the universe, and to understand …

The discovery of cosmic acceleration has triggered a consistent body of theoretical work
aimed at modeling its phenomenology and understanding its fundamental physical nature …

Horizon-scale images of black holes (BHs) and their shadows have opened an
unprecedented window onto tests of gravity and fundamental physics in the strong-field …

The dawn of the twenty-first century came with very positive prospects for gravity, cosmology,
and astrophysics. Technological progress made it possible for cosmology to enter to its …

A joint hierarchical Bayesian analysis of the binary black hole (BBH) mass function, merger
rate evolution, and cosmological parameters can be used to extract information on both the …

We investigate the synergy of upcoming galaxy surveys and gravitational wave (GW)
experiments in constraining late-time cosmology, examining the cross-correlations between …

We point out that dark-energy perturbations may become unstable in the presence of a
gravitational wave of sufficiently large amplitude. We study this effect for the cubic Horndeski …

Positivity bounds—constraints on any low-energy effective field theory imposed by the
fundamental axioms of unitarity, causality and locality in the UV—have recently been used to …

The first multi-messenger gravitational wave event has had a transformative effect on the
space of modified gravity models. In this paper we study the enhanced tests of gravity that …

We present the data-driven late-time reconstruction of gravitational theories and dark energy
models on cosmological scales. We showcase the power of present cosmological probes at …