Properties of ultralight bosons from heavy quasar spins via superradiance
Abstract
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 purpose, we use the SpinModified Fundamental Plane of black hole activity, which nonlinearly connects the following four variables (in the source frame): radio luminosity, Xray or optical luminosity (via the [OIII] emission line), black hole mass and spin. Taking into account the uncertainties in luminosity measurements, conversion factors, relativistic beaming and physical properties of the AGN system, we derive lower bounds on the spins of a group of heavy, jetted AGNs. Using these results, we study the direct implications on the mass spectrum of the ultralight particles of scalar (axionlike), vector (dark photon) and tensor types (additional spin2 particles). We close unexplored gap in the parameter space 10^{20}10^{19}eV. We obtain upper bounds on the axion decay constant (equivalently lower bounds on the selfinteraction strength) considering selfinteractions could prevent the axion particles entering the instability, and be the reason for nonobservation of superradiance. Assuming axion is described by mass and decay constant, we obtain upper limits on what fraction of dark matter can be formed by ultralight particles and find that single spieces axionlike light particle can constitute at most 10% of the dark matter in the mass range: 10^{21} < μ (eV) < 10^{17}.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 May 2021
 DOI:
 10.1088/14757516/2021/05/007
 arXiv:
 arXiv:2012.12790
 Bibcode:
 2021JCAP...05..007U
 Keywords:

 active galactic nuclei;
 axions;
 accretion;
 dark matter experiments;
 High Energy Physics  Phenomenology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 Astrophysics  High Energy Astrophysical Phenomena;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 15 pages, 7 figures, version accepted for publication to JCAP