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arXiv 2102.11745hep-thgr-qc
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宇宙学de Sitter时空中存在背景电磁场时的费米Bell破坏

Fermionic Bell violation in the presence of background electromagnetic fields in the cosmological de Sitter spacetime

Md Sabir Ali, Sourav Bhattacharya, Shankhadeep Chakrabortty, Shagun Kaushal

摘要:

在宇宙学de Sitter时空中,在恒定强度的背景电磁场存在下,研究了Dirac费米子对贝尔不等式的破坏。得到了Dirac模函数的正交化形式,并得到了相应的Bogoliubov系数的压缩态展开式.我们着重讨论了两种情况:强电场和重质量极限(相对于哈勃常数).利用压缩态展开,我们证明了真空和一些最大纠缠初态的Bell破坏。尽管背景磁场本身不能产生粒子,但在存在背景电场和/或时空曲率的情况下,它可以影响粒子的产生速率。因此,我们在这里的主要目的是研究背景磁场强度在贝尔破坏中的作用。在这方面的定性差异,不同的最大纠缠初始状态。进一步推广这些结果到所谓的$α$ -真空也进行了讨论。

英文摘要:

The violation of the Bell inequality for Dirac fermions is investigated in the cosmological de Sitter spacetime, in the presence of background electromagnetic fields of constant strengths. The orthonormal Dirac mode functions are obtained and the relevant in-out squeezed state expansion in terms of the Bogoliubov coefficients are found. We focus on two scenarios here : strong electric field and heavy mass limits (with respect to the Hubble constant). Using the squeezed state expansion, we then demonstrate the Bell violations for the vacuum and some maximally entangled initial states. Even though a background magnetic field alone cannot create particles, in the presence of background electric field and or spacetime curvature, it can affect the particle creation rate. Our chief aim thus here is to investigate the role of the background magnetic field strength in the Bell violation. Qualitative differences in this regard for different maximally entangled initial states are shown. Further extension of these results to the so called $α$-vacua are also discussed.

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