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arXiv 2101.11567gr-qcquant-ph
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Einstein-Cartan理论中的纠缠产生

Entanglement production in Einstein-Cartan theory

Alessio Belfiglio, Orlando Luongo, Stefano Mancini

摘要:

本文研究了具有挠率的膨胀时空中Dirac场和Klein-Gordon场的纠缠产生。挠率在这里被认为是根据爱因斯坦-嘉当理论与共形平坦的弗里德曼-罗伯逊-沃克时空。在这个框架中,挠率被看作是一个外场,满足直接从宇宙学常数原理得到的精确约束。对于狄拉克场,我们发现扭转增加了纠缠量。这在粒子动量较小的情况下尤为明显。我们讨论了泡利不相容原理的作用,鉴于我们的结果,特别是,我们提出了一个解释的两个最大值发生的纠缠熵存在扭转。对于Klein-Gordon场,与Dirac情形不同,该模型可以通过采用与Dirac情形相同的标度因子来精确求解。再次,我们展示了扭转如何影响纠缠量,提供了一个强大的物理动机背后的纠缠熵的增加或减少。我们的研究结果的直接比较也进行了讨论,鉴于以前的结果在没有扭转。为此,我们突出我们的期望将如何改变的狄拉克和克莱因-戈登场的扭转和尺度因子之间的耦合。

英文摘要:

We study the entanglement production for Dirac and Klein-Gordon fields in an expanding spacetime characterized by the presence of torsion. Torsion is here considered according to the Einstein-Cartan theory with a conformally flat Friedmann-Robertson-Walker spacetime. In this framework, torsion is seen as an external field, fulfilling precise constraints directly got from the cosmological constant principle. For Dirac field, we find that torsion increases the amount of entanglement. This turns out to be particularly evident for small values of particle momentum. We discuss the roles of Pauli exclusion principle in view of our results, and, in particular, we propose an interpretation of the two maxima that occur for the entanglement entropy in presence of torsion. For Klein-Gordon field, and differently from the Dirac case, the model can be exactly solved by adopting the same scale factor as in the Dirac case. Again, we show how torsion affects the amount of entanglement, providing a robust physical motivation behind the increase or decrease of entanglement entropy. A direct comparison of our findings is also discussed in view of previous results derived in absence of torsion. To this end, we give prominence on how our expectations would change in terms of the coupling between torsion and the scale factor for both Dirac and Klein-Gordon fields.

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