标题： 带电标量场在弦论黑洞镜系统中的超辐射不稳定性 显示英文标题

标题： Superradiant instability of the charged scalar field in stringy black hole mirror system

摘要： 已经证明，在带电弦黑洞中，标量场的质量无法在事件视界外部产生一个势阱来捕获超辐射模式。 这意味着带电弦黑洞对带有质量的带电标量扰动是稳定的。 在本文中，我们将研究由于类似镜面边界条件而在带电弦黑洞背景下的无质量标量场的超辐射不稳定性。 通过使用渐近匹配方法推导出了不稳定超辐射模式的解析表达式。 还指出，当标量场的电荷$q$很大且镜面半径$r_m$很小时，黑洞镜面系统会变得极其不稳定。 显示英文摘要

摘要： It has been shown that the mass of the scalar field in the charged stringy black hole is never able to generate a potential well outside the event horizon to trap the superradiant modes. This is to say that the charged stringy black hole is stable against the massive charged scalar perturbation. In this paper we will study the superradiant instability of the massless scalar field in the background of charged stringy black hole due to a mirror-like boundary condition. The analytical expression of the unstable superradiant modes is derived by using the asymptotic matching method. It is also pointed out that the black hole mirror system becomes extremely unstable for a large charge $q$ of scalar field and the small mirror radius $r_m$.