4 papers
Accretion, Evaporation and Superradiance Phase Diagram of (Primordial) Black Holes and eV Scalar, Vector, Tensor Fields
Caner Unal
We obtain the accretion, evaporation and superradiance phase diagram of astrophysical and primordial black holes in the mass range . This black hole m…
Properties of Ultralight Bosons from Spins of Heavy Quasars via Superradiance
Caner Unal, Fabio Pacucci, Abraham Loeb
The mass and the spin of accreting and jetted black holes, at the center of Active Galactic Nuclei (AGNs), can be probed by analyzing their electromagnetic spectra. For this purpos…
Axion-Gauge Dynamics During Inflation as the Origin of Pulsar Timing Array Signals and Primordial Black Holes
Caner Unal, Alexandros Papageorgiou, Ippei Obata
We demonstrate that the recently announced signal for a stochastic gravitational wave background (SGWB) from pulsar timing array (PTA) observations, if attributed to new physics, i…
Probing ultralight scalar, vector and tensor dark matter with pulsar timing arrays
Caner Unal, Federico R. Urban, Ely D. Kovetz
Pulsar timing arrays (PTAs) are sensitive to oscillations in the gravitational potential along the line-of-sight due to ultralight particle pressure. We calculate the probing power…