Diluted axion star collisions with neutron stars

Bai, Yang; Du, Xiaolong; Hamada, Yuta

doi:10.1088/1475-7516/2022/01/041

Title: Diluted axion star collisions with neutron stars

Journal Article · 19 January 2022 · Journal of Cosmology and Astroparticle Physics

DOI: https://doi.org/10.1088/1475-7516/2022/01/041 · OSTI ID:1979352

Bai, Yang ^[1]; Du, Xiaolong ^[2]; Hamada, Yuta ^[3]

University of Wisconsin, Madison, WI (United States); Univ. of Wisconsin, Madison, WI (United States)
Carnegie Observatories, Pasadena, CA (United States)
Harvard University, Cambridge, MA (United States)

Diluted axion star, a self-gravitating object with the quantum pressure balancing gravity, has been predicted in many models with a QCD axion or axion-like particle. It can be formed in the early universe and composes a sizable fraction of dark matter. One could detect the transient radio signals when it passes by a magnetar with the axion particle converted into photon in the magnetic field. Using both numerical and semi-analytic approaches, we simulate the axion star's dynamic evolution and estimate the fraction of axion particles that can have a resonance conversion during such a collision event. We have found that both self-gravity and quantum pressure are not important after the diluted axion star enters the Roche radius. A free-fall approximate can capture individual particle trajectories very well. Finally, with some optimistic cosmological and astrophysical assumptions, the QCD axion parameter space can be probed from detecting such a collision event by radio telescopes.

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Research Organization:: University of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: SC0017647

OSTI ID:: 1979352

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 01 Vol. 2022; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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