Gravitational waves (GWs) were recently detected for the first time. This revolutionary
discovery opens a new way of learning about particle physics through GWs from first-order …

The exploration of the universe has recently entered a new era thanks to the multi-
messenger paradigm, characterized by a continuous increase in the quantity and quality of …

The 100 years since the publication of Albert Einstein's theory of general relativity saw
significant development of the understanding of the theory, the identification of potential …

We establish a generic, fully relativistic formalism to study gravitational-wave emission by
extreme-mass-ratio systems in spherically symmetric, nonvacuum black hole spacetimes …

The current cosmological model requires new physics beyond the standard model of
elementary particles and fields, such as dark matter and dark energy. Their nature is …

We introduce a family of solutions of Einstein's gravity minimally coupled to an anisotropic
fluid, describing asymptotically flat black holes with “hair” and a regular horizon. These …

The gravitational-wave astronomical revolution began in 2015 with LIGO's observation of the
coalescence of two stellar-mass black holes. Over the coming decades, ground-based …

We investigate the possibility of measuring the primordial gravitational wave (GW) signal
across 21 decades in frequencies, using the cosmic microwave background (CMB), pulsar …

A major challenge for gravitational-wave (GW) detection in the μ Hz band is engineering a
test mass (TM) with sufficiently low acceleration noise. We propose a GW detection concept …

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 …