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 …

In this article, I introduce ideas and techniques to extract information about the equation of
state of matter at very high densities from gravitational waves emitted before, during and …

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 …

Neutron stars and quark stars are ideal laboratories to study fundamental physics at supra
nuclear densities and strong gravitational fields. Astrophysical observables, however …

General Relativity has shown an outstanding observational success in the scales where it
has been directly tested. However, modifications have been intensively explored in the …

Determining the Equation of State (EOS) of dense neutron-rich nuclear matter is a shared
goal of both nuclear physics and astrophysics. Except possible phase transitions, the density …

Gravitational wave astronomy provides an unprecedented opportunity to test the nature of
black holes and search for exotic, compact alternatives. Recent studies have shown that …

A generic feature of nearly out-of-equilibrium dissipative systems is that they resonate
through a set of quasinormal modes. Black holes—the absorbing objects par excellence …

Universal relations that are independent of the equation of state (EOS) for neutron star
matter are valuable, if they exist, for extracting the neutron star properties, which generally …

Compact bosonic field configurations, or boson stars, are promising dark matter candidates
which have been invoked as an alternative description for the supermassive compact …