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arXiv 1404.0602gr-qchep-th
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二维中的纠缠熵与负能量

Entanglement entropy and negative energy in two dimensions

Eugenio Bianchi, Matteo Smerlak

摘要:

众所周知,量子效应可以产生负的能量密度,尽管时间有限。在这里,我们表明,在二维CFT的背景下,这种负能量密度存在于任何非平凡的共形真空,并可以解释的纠缠结构的状态。我们导出了真空中出射能流与纠缠熵之间的一个精确恒等式。当应用到二维模型的黑洞蒸发,这个身份意味着,幺正性是不相容的单调质量损失。

英文摘要:

It is well known that quantum effects can produce negative energy densities, though for limited times. Here we show in the context of two-dimensional CFT that such negative energy densities are present in any non-trivial conformal vacuum and can be interpreted in terms of the entanglement structure of such states. We derive an exact identity relating the outgoing energy flux and the entanglement entropy in the in-vacuum. When applied to two-dimensional models of black hole evaporation, this identity implies that unitarity is incompatible with monotonic mass loss.

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