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arXiv · 1810.01420

Boson Star from Repulsive Light Scalars and Gravitational Waves

Djuna Croon·JiJi Fan·Chen Sun
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Abstract

We study properties of boson stars consisting of ultra-light scalar dark matter with repulsive self-interactions. We investigate the origin of the maximum mass of spherically symmetric stable stars which emerges only when solving the full equations of motion in curved space-time, but not when solving the approximated Schr\"odinger-Newton equations. When the repulsion is weak, the backreaction of the curvature on the scalars acts as an additional source of attraction and can overcome the repulsion, resulting in a maximum star mass and compactness. We also point out that the potential in a UV completed particle physics model of light scalar dark matter is generally more complicated than the widely used $\phi^4$ interaction. Additional interactions beyond $\phi^4$ in the potential can dramatically change the properties of boson stars as well as modify the prospect of LIGO gravitational wave detection for binary mergers of boson stars.

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Djuna Croon, JiJi Fan, Chen Sun. 2018-10-02. Boson Star from Repulsive Light Scalars and Gravitational Waves. https://doi.org/10.1088/1475-7516%2F2019%2F04%2F008

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