We investigate the escape probabilities of the photons near the horizon of the Kerr-Sen black hole. We find that the escape probabilities of the photons are nonzero in the event horizon limit of the extreme Kerr-Sen black hole if the light sources are near the equator. We show that the escape probability of a photon increases with the radial position of the light source. It is also uncovered that the escape probability decreases if the light source with constant radius moves from the equatorial plane to the pole. Besides, we discover that the escape probability of a photon in the Carter frame is always greater than the one in the locally non-rotating frame, except on the pole, where they are equal.

中文翻译：

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克尔森黑洞视界附近的光子发射

我们研究了克尔森黑洞视界附近光子的逃逸概率。我们发现，如果光源靠近赤道，那么在极端克尔森黑洞的事件视界极限内，光子的逃逸概率是非零的。我们表明光子的逃逸概率随着光源的径向位置而增加。还发现如果恒定半径的光源从赤道平面移动到极点，逃逸概率会降低。此外，我们发现卡特坐标系中光子的逃逸概率总是大于局部非旋转坐标系中的逃逸概率，除了在极点上，它们是相等的。