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arXiv 1302.0853hep-thgr-qc
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因果全息信息的热化

Thermalization of Causal Holographic Information

Veronika E. Hubeny, Mukund Rangamani, Erik Tonni

摘要:

我们研究与渐进AdS时空边界中给定子区域相关的因果楔形。我们的动机的一部分是为了更好地理解最近提出的全息可观察的因果全息信息(CHI),这是由躺在因果楔的边界上的散装co-dimension 2表面的面积。有人建议,CHI捕获的基本量的信息包含在约化的密度矩阵的散装几何形状。为了进一步探索其属性,我们研究其行为在时间依赖的情况下。作为一个简单的模型,我们专注于零尘埃坍缩的渐近AdS时空,模型Vaidya AdS几何。我们认为,虽然CHI是一般的准telelogical随时间变化的背景下,适当的选择子区域的共形场论,CHI的时间演化是完全因果关系。我们评论这一观察的影响,更一般的因果结构的功能和对比我们的结果与全息纠缠熵的行为。同时我们还得到了在这些背景下CHI和纠缠熵的早期增长率和晚期饱和率(相对于热值)。

英文摘要:

We study causal wedges associated with a given sub-region in the boundary of asymptotically AdS spacetimes. Part of our motivation is to better understand the recently proposed holographic observable, causal holographic information (CHI), which is given by the area of a bulk co-dimension two surface lying on the boundary of the causal wedge. It has been suggested that CHI captures the basic amount of information contained in the reduced density matrix about the bulk geometry. To explore its properties further we examine its behaviour in time-dependent situations. As a simple model we focus on null dust collapse in an asymptotically AdS spacetime, modeled by the Vaidya-AdS geometry. We argue that while CHI is generically quasi-telelogical in time-dependent backgrounds, for suitable choice of sub-regions in conformal field theories, the temporal evolution of CHI is entirely causal. We comment on the implications of this observation and more generally on features of causal constructions and contrast our results with the behaviour of holographic entanglement entropy. Along the way we also derive the rate of early time growth and late time saturation (to the thermal value) of both CHI and entanglement entropy in these backgrounds.

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