Perturbations of stars and black holes have been one of the main topics of relativistic
astrophysics for the last few decades. They are of particular importance today, because of …

Perturbations of black holes, initially considered in the context of possible observations of
astrophysical effects, have been studied for the past 10 years in string theory, brane-world …

Heavy ion collision experiments recreating the quark-gluon plasma that filled the nascent
universe have established that it is a nearly perfect liquid that flows with such minimal …

Newly formed black holes are expected to emit characteristic radiation in the form of
quasinormal modes, called ringdown waves, with discrete frequencies. LISA should be able …

Assuming that general relativity is the correct theory of gravity in the strong-field limit, can
gravitational-wave observations distinguish between black holes and other compact object …

We study the inspiral, merger, and ringdown of unequal mass black hole binaries by
analyzing a catalogue of numerical simulations for seven different values of the mass ratio …

We produce the first numerical relativity binary black hole gravitational waveforms in a
higher-curvature theory beyond general relativity. In particular, we study head-on collisions …

LISA, the Laser Interferometer Space Antenna, will usher in a new era in gravitational-wave
astronomy. As the first anticipated space-based gravitational-wave detector, it will expand …

We investigate higher than the first order gravitational perturbations in the Newman-Penrose
formalism. Equations for the Weyl scalar ψ 4, representing outgoing gravitational radiation …

A numerical-relativity calculation yields in general a solution of the Einstein equations
including also a radiative part, which is in practice computed in a region of finite extent …