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Title: Electromagnetic emission from axionic boson star collisions
Author: Sanchis-Gual, Nicolas
Zilhão, Miguel
Cardoso, Vitor
Issue Date: 12-Jul-2022
Publisher: American Physical Society
Abstract: We explore the dynamics of boson stars in the presence of axionic couplings through nonlinear evolutions of Einstein's field equations. We show that, for large axionic couplings, isolated boson stars become unstable, and decay via a large burst of electromagnetic radiation, becoming less massive and more dilute. Our full nonlinear results are in good agreement with flat-space estimates for the critical couplings. We then consider head-on collisions of sub-critical boson stars and study the electromagnetic and gravitational signal. Boson stars cluster around the critical point via interactions, and we argue that mergers will generically be also sources of electromagnetic radiation, in addition to gravitational waves, which can be used to place constraints on the axionic coupling if such multimessenger signals are detected.
Peer review: yes
DOI: 10.1103/PhysRevD.106.064034
ISSN: 1550-7998
Appears in Collections:CIDMA - Artigos
GGDG - Artigos

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