Stimulated radiation from axion cluster evolution

Details Stimulated radiation from axion cluster evolution Stimulated radiation from axion cluster evolution

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phrvd..52.3226k&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 52, Issue 6, 15 September 1995, pp.3226-3238

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Axions And Other Nambu-Goldstone Bosons, Dark Matter, Quasars, Active Or Peculiar Galaxies, Objects, And Systems, Particle-Theory And Field-Theory Models Of The Early Universe

Scientific paper

If axions exist and make up part or all of the cosmological dark matter, then some are likely to be clustered in gravitational potential wells. The properties of these axion clusters will depend on their velocity and density profiles as well as on the mass of the axions. We derive the stimulated and spontaneous decay rate equations for general axion distribution functions. Under certain conditions lasing action can commence, and we give approximate bounds for lasing in pure (i.e., uncontaminated by normal matter) axion clusters. A simple spherical constant-density axion cluster model is studied in detail. For a range of cluster mass M and radius R, and axion mass ma, photons from spontaneous axion decay can trigger exponential growth of photon number via stimulated decay. Approximate bounds for lasing are obtained for this model, and numerical results are presented. We show that it is possible that lasing axion clusters played a role in forming the large-scale structure of the universe. Our results can be easily applied to any pseudo Goldstone boson coupled to photons through the anomaly.

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