论文标题
广义Vaidya时空：地平线，保形对称性，表面重力和对角线化
Generalized Vaidya spacetime: horizons, conformal symmetries, surface gravity and diagonalization
论文作者
论文摘要
在本文中，考虑了广义Vaidya时空的不同特性。我们定义地平线的位置。我们表明，明显的视野可以包含事件视野。将所有类型的视野的位置与通常的Vaidya时空中的位置进行了比较。我们研究了这个时空中的时间型测量学。出现了对Schwarzschild和Vaidya案件的新更正，当这些校正不可忽略时，我们会提供条件。同样，我们考虑了保形杀伤向量，并将指标转换为保态静态坐标。我们沿着Null和及时的测量学引入了一个新的运动常数，该常量是由同性恋杀伤向量产生的。共形静态坐标允许对对角线化vaidya时空。已经计算出针对灰尘和僵硬的液体情况的表面重力。
In this paper, the different properties of generalized Vaidya spacetime are considered. We define the location of horizons. We show that the apparent horizon can contain the event horizon. The locations of all types of horizons are compared with ones in the usual Vaidya spacetime. We investigate the timelike geodesics in this spacetime. New corrections to Schwarzschild and Vaidya cases appear and we give conditions when these corrections are not negligible. Also, we consider the conformal Killing vector and transform the metric to conformally-static coordinates. We introduce a new constant of motion along null and timelike geodesics, which is generated by a homothetic Killing vector. The conformally-static coordinates allow diagonalizing of the generalized Vaidya spacetime. The surface gravity has been calculated for the dust and stiff fluid cases.
