Quantum coherence down the wormhole
Quantum coherence down the wormhole
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DOI：
10.1016/0370-2693(87)90028-1
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发表时间：
1987-09
影响因子：
4.4
通讯作者：
S. Hawking
中科院分区：
文献类型：
--
作者：
S. Hawking
研究表明，在任何允许时空拓扑非简单连接的量子引力理论中，纯量子态都会衰变成混合态。原因是最终状态可能包含很少的封闭宇宙。人们无法探测到这些封闭宇宙的存在，或测量它们的量子态。这意味着最终状态中渐近平坦时空的部分似乎处于混合状态。估计粒子碰撞中量子相干性的损失。它来自连接两个渐近欧几里德区域的虫洞。对于标量粒子来说，这种影响非常显着。它将使任何未与杨-米尔斯场耦合的标量场在整个时空中保持恒定。它可能对希格斯粒子产生重要影响，但对于高自旋粒子的影响很小。
It is shown that pure quantum states will appear to decay into mixed states in any theory of quantum gravity that allows the topology of spacetime to be non simply connected. The reason is that the final state may contain little closed universes. There is no way one can detect the existence of these closed universes, or measure their quantum state. This means that the part of the final state that is in asymptotically flat spacetime, appears to be in a mixed state. The loss of quantum coherence in particle collisions is estimated. It comes from a wormhole connecting two asymptotically euclidean regions. The effect would be significant for scalar particles. It would make any scalar field that was not coupled to a Yang-Mills field constant throughout spacetime. It could have an important effect on Higgs particles but the effect would be small for particles of higher spin.