标题： 克尔-纽曼时空中的闭合类时曲线的消除 显示英文标题

标题： Removal of Closed Timelike Curves in Kerr-Newman Spacetime

摘要： 提出了一种简单而系统的全新算法来研究Kerr-Newman时空的整体结构，即研究Kerr-Newman度规的时空中子流形的全局结构\theta=const 。通过引入一种略微不同于通常Boyer-Lindquist时间坐标的新的时间坐标，对这些时空中子流形的全局结构进行了研究。此外，还证明了迄今为止被认为由于闭合类时曲线的发展而在环奇点附近发生的可能因果性破坏实际上并不是困扰Kerr-Newman解的不可避免的病态现象，而仅仅是一种规范（坐标）伪影，因为它在从Boyer-Lindquist坐标变换到新的时间坐标时消失。最后这一点似乎支持了这样一个事实，即Kerr-Newman时空确实可以用来表示旋转带电黑洞时空的内部和外部区域。 显示英文摘要

摘要： A simple yet systematic new algorithm to investigate the global structure of Kerr-Newman spacetime is suggested. Namely, the global structure of \theta=const. timelike submanifolds of Kerr-Newman metric are studied by introducing a new time coordinate slightly different from the usual Boyer-Lindquist time coordinate. In addition, it is demonstrated that the possible causality violation thus far regarded to occur near the ring singularity via the development of closed timelike curves there is not really an unavoidable pathology which has plagued the Kerr-Newman solution but simply a gauge (coordinate) artifact as it disappears upon transforming from Boyer-Lindquist to the new time coordinate. This last point appears to lend support to the fact that, indeed, the Kerr-Newman spacetime is a legitimate solution to represent the interior as well as the exterior regions of a rotating, charged black hole spacetime.