Parametric-resonance based phenomenology of gravitating axion configurations
arXiv:1907.12089
Abstract
One of the most compelling candidates for Dark Matter (DM) are light pseudo-scalar particles (axions), motivated by the strong CP problem and axiverse scenario in string theory. Depending on their mass and type of self-interaction, these particles can build self-gravitating configurations such as compact objects, DM clumps or even galactic DM halos. On the other hand, superradiant instabilities can produce long-living extended configurations (scalar clouds) gravitating around Black Holes (BHs). As these scalars are real and harmonic, their interaction with the other matter components can induce a parametric resonance that might lead to their observable signatures. First, we consider the orbital dynamics of test particles in these axion configurations, show when resonances can occur and discuss the secular evolution of the orbital elements. This scenario can lead to observable consequences for binary pulsars or S stars around the supermassive BH in our Galaxy. Secondly, we discuss electromagnetic (EM) field instabilities in homogeneous axion configurations as well as scalar clouds around Kerr BHs. These axion-photon resonances can quench superradiant instabilities, while producing an observable signature in the EM sector. We give an analytical estimate of the rate of these processes that have good agreement with the fully relativistic numerical simulations and discuss the impact of plasma in the vicinity of BHs on these instabilities.
arXiv commentMSc thesis at the University of Belgrade; 13 Sections and 5 Appendices; 100 pages, 37 figures; Based on arXiv:1806.07331 , arXiv:1811.04945
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