We summarize our current knowledge of neutron-star masses and radii. Recent
instrumentation and computational advances have resulted in a rapid increase in the …

The status of experimental tests of general relativity and of theoretical frameworks for
analyzing them is reviewed and updated. Einstein's equivalence principle (EEP) is well …

On 17 August 2017, the LIGO and Virgo observatories made the first direct detection of
gravitational waves from the coalescence of a neutron star binary system. The detection of …

In recent years our understanding of neutron stars has advanced remarkably, thanks to
research converging from many directions. The importance of understanding neutron star …

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 …

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 …

Recent developments in the theory of pure neutron matter and experiments concerning the
symmetry energy of nuclear matter, coupled with recent measurements of high-mass …

The discovery of the first pulsar in a binary star system, the Hulse–Taylor pulsar, 50 years
ago opened up an entirely new field of experimental gravity. For the first time it was possible …

Despite their long history and astrophysical importance, some of the key properties of
neutron stars are still uncertain. The extreme conditions encountered in their interiors …

We review the physics of hyperons and Δ-resonances in dense matter in compact stars. The
covariant density functional approach to the equation of state and composition of dense …