Abstract The standard Λ Cold Dark Matter (ΛCDM) cosmological model provides a good
description of a wide range of astrophysical and cosmological data. However, there are a …

Abstract The Einstein Telescope (ET), the European project for a third-generation
gravitational-wave detector, has a reference configuration based on a triangular shape …

The past decades have witnessed a lot of progress in gravitational lensing with two main
targets: stars and galaxies (with active galactic nuclei). The success is partially attributed to …

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 study gravitational lensing of light by hairy black holes, which, in a certain parameter
regime, can possess two photon spheres of different size outside the event horizon. In …

Secure confirmation that a gravitational wave (GW) has been gravitationally lensed would
bring together these two pillars of General Relativity for the first time. This breakthrough is …

The dark sirens method enables us to use gravitational wave events without electromagnetic
counterparts as tools for cosmology and tests of gravity. Furthermore, the dark sirens …

Extreme mass-ratio inspirals (EMRIs), namely binary systems composed of a massive black
hole and a compact stellar-mass object, are anticipated to be among the gravitational wave …

Similarly to light, gravitational waves can be gravitationally lensed as they propagate near
massive astrophysical objects such as galaxies, stars, or black holes. In recent years …