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arXiv · 2309.05743

Rotating multistate axion boson stars

Yan-Bo Zeng·Shi-Xian Sun·Si-Yuan Cui·Yu-Peng Zhang·Yong-Qiang Wang
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Abstract

We consider excited configuration and multistate configuration of rotating axion boson stars~(RABSs).RABSs are asymptotically flat, stationary, spinning, horizonless solutions of Einstein-Klein-Gordon theory in which the scalar potential depends on scalar field mass $\mu$ and axion decay constant $f_a$. The excited RABSs have two types of solutions, including $^2S$ state and $^2P$ state. The rotating multistate axion boson stars~(RMABSs) consist of coupled fundamental configuration and excited configuration, and also include two types of solutions: $^1S^2S$ state and $^1S^2P$ state. Some differences between RABSs models and rotating mini-boson stars models are discussed. We show the solution space of these models for different values of decay constant $f_a$. We found fundamental RABSs have a higher maximum mass than the excited state in the low decay constant region. Moreover, the multistate configuration allows a higher mass than both the fundamental configuration and the excited configuration at the same frequency. We also found the RMABSs have the second branch in which the ergo-region emerges. This means the second branch may be superradiant unstable.

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Yan-Bo Zeng, Shi-Xian Sun, Si-Yuan Cui, Yu-Peng Zhang, Yong-Qiang Wang. 2023-09-11. Rotating multistate axion boson stars. https://arxiv.org/abs/2309.05743

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