标题： 量子时间机器 显示英文标题

标题： Quantum time machine

摘要： Misner空间向欧几里得区域的延续被看到暗示了拓扑限制，即闭合空间方向的周期变得与时间有关。这种限制导致了一种修改后的洛伦兹型Misner空间，在其中，对于量化复质量零标量场的重整化应力-能量张量在所有地方都是规则的，甚至在时间顺序视界上也是如此。然后可以利用修改后的Misner空间构造出一个仅具有亚微观尺寸的量子力学稳定的时间机器，对于这种时间机器，半经典霍金的时间顺序保护假说不再是一个障碍。 显示英文摘要

摘要： The continuation of Misner space into the Euclidean region is seen to imply the topological restriction that the period of the closed spatial direction becomes time-dependent. This restriction results in a modified Lorentzian Misner space in which the renormalized stress-energy tensor for quantized complex massless scalar fields becomes regular everywhere, even on the chronology horizon. A quantum-mechanically stable time machine with just the sub-microscopic size may then be constructed out of the modified Misner space, for which the semiclassical Hawking's chronology protection conjecture is no longer an obstruction.