Imprints of axion superradiance in the CMB

Diego Blas, Samuel J. Witte

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Light axions (ma10-10 eV) can form dense clouds around rapidly rotating astrophysical black holes via a mechanism known as rotational superradiance. The coupling between axions and photons induces a parametric resonance, arising from the stimulated decay of the axion cloud, which can rapidly convert regions of large axion number densities into an enormous flux of low-energy photons. In this work we consider the phenomenological implications of a superradiant axion cloud undergoing resonant decay. We show that the low-energy photons produced from such events will be absorbed over cosmologically short distances, potentially inducing massive shockwaves that heat and ionize the intergalactic medium over Mpc scales. These shockwaves may leave observable imprints in the form of anisotropic spectral distortions or inhomogeneous features in the optical depth.

Original languageEnglish
Article number103018
JournalPhysical Review D
Volume102
Issue number10
DOIs
Publication statusPublished - 16 Nov 2020

Fingerprint

Dive into the research topics of 'Imprints of axion superradiance in the CMB'. Together they form a unique fingerprint.

Cite this