Misner空间中的扩展时间旅行物体
Extended time-travelling objects in Misner space
摘要：
米斯纳空间是一个二维（2D）局部平坦的时空，它优雅地展示了封闭的类时曲线从因果行为良好的初始条件中出现。在这里，我们探索的运动刚性扩展对象在这个时间机器时空。这种2D时间旅行被认为是危险的，因为不可避免的自我碰撞（即物体与自身的碰撞）。然而，在一个简单的四维概括的米斯纳空间（一个物理上更相关的时空显然），我们发现了广泛的“安全”的时间旅行轨道没有任何自碰撞。
英文摘要：
Misner space is a two-dimensional (2D) locally-flat spacetime which elegantly demonstrates the emergence of closed timelike curves from causally well-behaved initial conditions. Here we explore the motion of rigid extended objects in this time-machine spacetime. This kind of 2D time-travel is found to be risky due to inevitable self-collisions (i.e. collisions of the object with itself). However, in a straightforward four-dimensional generalization of Misner space (a physically more relevant spacetime obviously), we find a wide range of "safe" time-travel orbits free of any self-collisions.
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