从乌龟坐标在动态Vaidya黑洞上的推广谈起

摘要

从一类参数未定的一般形式的乌龟坐标变换出发,找出了在动态Vaidya黑洞背景下能将波动方程化为标准形式且无发散的乌龟坐标所满足的条件.结果表明,以乌龟坐标变换为主要特征的Damour-Ruffini方法,用来计算动态黑洞的Hawking辐射时,只适用于事件视界,无法应用于表观视界.%Applying generalized tortoise coordinates with undetermined parameters to a dynamical Vaidya black hole, we find the interesting condition for reducing the wave function into its standard form without divergence. It is shown that the Damour-Ruffini method with tortoise coordinate can be applied only to the event horizon rather than the apparent horizon in a dynamical space time.