5 papers
Topics in the phenomenology of axions: the cases of cosmic strings and superradiance
Antonios Kyriazis
Originally proposed as a solution to the strong CP problem and later understood to be a good dark matter candidates, axions have appeared in a variety of beyond-the-standard-model…
Heating Up the Black Hole X-ray Binary Accretion Disk by Superradiance
Antonios Kyriazis, Fengwei Yang, Siyu Zhou
A superradiant cloud of ultralight axions around a black hole, that is part of an X-ray binary system, can heat up its accretion disk and be detected by the thermal X-ray spectrum…
Echoes of Global Cosmic Strings
Jeff A. Dror, Antonios Kyriazis
If the Universe underwent a cosmic phase transition, it may have left behind a network of cosmic strings. When these strings arise from the breaking of a gauge symmetry, their deca…
Gravitational Waves from Resonant Transitions of Tidally Perturbed Gravitational Atoms
Antonios Kyriazis, Fengwei Yang
Light bosons can form a gravitational atom (GA) around a spinning black hole through the superradiance process. Considering the black hole to be part of a binary system, the tidal…
Effects of a dark matter caustic passing through the Oort cloud
Yuxin Zhao, Antonios Kyriazis, Pierre Sikivie
We investigate the effect of a dark matter caustic passing through the Solar System. We find, confirming a previous result, that the Sun tracks the caustic surface for some time. W…