Abstract The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders
about the fundamental theory of nature at play in the extreme gravity regime, where the …

For ultra compact objects, light rings and fundamental photon orbits (FPOs) play a pivotal
role in the theoretical analysis of strong gravitational lensing effects, and of BH shadows in …

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 …

In the present Letter, we consider a class of extended scalar-tensor-Gauss-Bonnet (ESTGB)
theories for which the scalar degree of freedom is excited only in the extreme curvature …

We consider the status of black hole (BH) solutions with nontrivial scalar fields but no gauge
fields, in four-dimensional asymptotically flat spacetimes, reviewing both classical results …

The LIGO/Virgo detections of binary black hole mergers marked a watershed moment in
astronomy, ushering in the era of precision tests of Kerr dynamics. We review theoretical and …

One century after its formulation, Einstein's general relativity (GR) has made remarkable
predictions and turned out to be compatible with all experimental tests. Most of these tests …

The observation of the inspiral and merger of compact binaries by the LIGO/Virgo
collaboration ushered in a new era in the study of strong-field gravity. We review current and …

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 …

This review is focused on tests of Einstein's theory of general relativity with gravitational
waves that are detectable by ground-based interferometers and pulsar-timing experiments …