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 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 …

Scalar fields coupled to the Gauss-Bonnet invariant can undergo a tachyonic instability,
leading to spontaneous scalarization of black holes. Studies of this effect have so far been …

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 …

Scalarization is a mechanism that endows strongly self-gravitating bodies, such as neutron
stars and black holes, with a scalar-field configuration. It resembles a phase transition in that …

Exploring the nature of gravity in the strong curvature regime is seeing a surge of interest
lately. This is expected to intensify, as it is driven by current and future observations of …

In the present paper we investigate self-consistently slowly rotating neutron and strange
stars in R-squared gravity with Lagrangian f (R)= R+ aR 2, where a is a parameter. For this …

We construct models of slowly rotating, perfect-fluid neutron stars by extending the classical
Hartle—Thorne formalism to generic scalar-tensor theories of gravity. Working at second …

Spontaneous scalarization is a mechanism that endows relativistic stars and black holes
with a nontrivial configuration only when their spacetime curvature exceeds some threshold …