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arXiv 1801.02801hep-thastro-ph.HEgr-qc
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支持带电大质量标量场组态的带电反射星

Charged reflecting stars supporting charged massive scalar field configurations

Shahar Hod

摘要:

最近发表的Hod,Bhattacharjee和Sarkar的无毛定理揭示了一个有趣的事实:无水平线的致密反射星{ \it不能}支持由标量场、矢量场和张量场组成的空间规则构形。在本论文中,我们明确证明了在这些研究中观察到的有趣的无毛行为不是致密反射星的一般特征。特别地,我们将证明带电反射星{ \it}可以在它们的外部时空区域支持{ \it带电}大质量标量场组态。为此,我们解析求解的特征Klein-Gordon波动方程的线性化带电标量场的质量$μ$,电荷耦合常数$q$,球谐指数$l$的背景下的球对称紧凑的反射星的质量$M$,电荷$Q$,半径$R_{\text{s}}\gg M,Q$。有趣的是,证明了支持带电质量标量场组态的恒星半径离散集$\{R_{\text{s}}(M,Q,μ,q,l;n)\}^{n=\infty}_{n=1}$由合流超几何函数的特征零点决定。根据这个简单的观察,我们推导出一个非常紧凑的分析公式的离散光谱的恒星半径在中间制度$M\ll R_{\text{s}}\ll 1/μ$。通过直接数值计算证实了解析推导的共振谱。

英文摘要:

The recently published no-hair theorems of Hod, Bhattacharjee, and Sarkar have revealed the intriguing fact that horizonless compact reflecting stars {\it cannot} support spatially regular configurations made of scalar, vector and tensor fields. In the present paper we explicitly prove that the interesting no-hair behavior observed in these studies is not a generic feature of compact reflecting stars. In particular, we shall prove that charged reflecting stars {\it can} support {\it charged} massive scalar field configurations in their exterior spacetime regions. To this end, we solve analytically the characteristic Klein-Gordon wave equation for a linearized charged scalar field of mass $μ$, charge coupling constant $q$, and spherical harmonic index $l$ in the background of a spherically symmetric compact reflecting star of mass $M$, electric charge $Q$, and radius $R_{\text{s}}\gg M,Q$. Interestingly, it is proved that the discrete set $\{R_{\text{s}}(M,Q,μ,q,l;n)\}^{n=\infty}_{n=1}$ of star radii that can support the charged massive scalar field configurations is determined by the characteristic zeroes of the confluent hypergeometric function. Following this simple observation, we derive a remarkably compact analytical formula for the discrete spectrum of star radii in the intermediate regime $M\ll R_{\text{s}}\ll 1/μ$. The analytically derived resonance spectrum is confirmed by direct numerical computations.

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