We show that the existence of clouds of ultralight particles surrounding black holes during
their cosmological history as members of a binary system can leave a measurable imprint on …

Superradiant clouds of ultralight bosons can leave an imprint on the gravitational waveform
of black hole binaries through “ionization” and “resonances.” We study the sequence of …

Rotating black holes can produce superradiant clouds of ultralight bosons. When the black
hole is part of a binary system, its cloud can undergo resonances and ionization. These …

Superradiant instability can form clouds around rotating black holes (BHs) composed of
ultralight bosonic fields, such as axions. A BH with such a cloud in a binary system exhibits …

Quantum black holes (BHs), thought of as an excited multilevel system, can be effectively
modelled by replacing an event horizon with a partially reflective membrane. This emergent …

Variations at the event horizon structure of a black hole will emit the signals of the
gravitational wave echoes associated with the ringdown of the binary black hole merger. In …

Our current understanding is that an environment–mainly consisting of gas or stars–is
required to bring massive black hole binaries (MBHBs) with total redshifted mass to the LISA …

Mixing between ultralight bosons and the Standard Model photon may allow access to the
hitherto invisible Universe. In the presence of plasma, photons are dressed with an effective …

Ultralight bosonic fields can form condensates, or clouds, around spinning black holes.
When this system is under the influence of a secondary massive body, its tidal response can …

The LIGO-Virgo analyses of signals from compact binary mergers observed so far have
assumed isolated binary systems in a vacuum, neglecting the potential presence of …