In this work we introduce phenomxo4a, the first phenomenological, frequency-domain
gravitational waveform model to incorporate multipole asymmetries and precession angles …

Ultralight vectors can extract energy and angular momentum from a Kerr black hole (BH)
due to superradiant instability, resulting in the formation of a BH-condensate system. In this …

The ringdown (RD) phase of gravitational waves is of prime interest for testing general
relativity (GR). The modeling of the linear quasinormal modes (QNMs) within the Kerr …

Numerical relativists can now produce gravitational waveforms with memory effects routinely
and accurately. The gravitational-wave memory effect contains very low-frequency …

GW190521 is a remarkable gravitational-wave signal on multiple fronts: its source is the
most massive black hole binary identified to date and could have spins misaligned with its …

We investigate a mechanism of primordial black hole (PBH) formation that avoids any
dependence on specific inflationary features or exotic physics. In this scenario, the required …

Most gravitational wave (GW) events observed so far by the LIGO and Virgo detectors are
consistent with mergers of binary black holes (BBHs) on quasicircular orbits. However, some …

Matched-filtering gravitational-wave search pipelines identify gravitational-wave signals by
computing correlations, ie, signal-to-noise ratios, between gravitational-wave detector data …

With about a hundred binary black hole (BBH) mergers detected by LIGO-Virgo-KAGRA, and
with several hundreds expected in the current O4 run, gravitational waves (GWs) are …

Stochastic gravitational-wave (GW) background (SGWB) contains information about the
early Universe and astrophysical processes. The recent evidence of SGWB by pulsar timing …