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arXiv 2209.05792hep-thgr-qc
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局部引力猝灭的纠缠熵

Entanglement entropy of local gravitational quenches

Justin R. David, Jyotirmoy Mukherjee

AI总结:

本文研究4维中整数自旋场产生的局部猝灭态,通过规范选择与几何探针计算半空间纠缠熵,证明其随时间增长并饱和于 log 2,且窄宽度极限由自旋及对称性表示决定。

摘要:

我们研究了在4维时空中,由整数自旋 s≤2 的场产生的局部激发态的 Rényi 熵/纠缠熵的时间依赖关系。对于自旋0和1,这些态的特征是具有给定宽度的局域能量密度,并以球面波形式按光速传播。对于自旋2情形,由于不存在局域规范不变的应力张量,我们利用 Kretschmann 标量探测这些态,并证明它们代表以光速传播的局域曲率密度。我们考虑了带有这些激发的半空间约化密度矩阵,并发展了包括一种便利规范选择在内的方法,用以在这些猝灭进入半区域时计算 Rényi 熵/纠缠熵的时间依赖。在所有情形中,纠缠熵均随时间增长,并在 log 2 处饱和。在这些激发的宽度趋于零的极限下,熵的增长由阶数为 2s+1 的多项式决定,该多项式以到余维2纠缠面的距离与时间之比为变量。与场产生的猝灭相对应的多项式,可依据它们在余维2纠缠面存在时所保持的 SO(2)_T×SO(2)_L 对称性下的表示进行组织。对于在该对称性下按标量变换的场,阶数为 2s+1 的多项式完全由自旋决定。

英文摘要:

We study the time dependence of Rényi/entanglement entropies of locally excited states created by fields with integer spins $s \leq 2$ in $4$ dimensions. For spins 0, 1 these states are characterised by localised energy densities of a given width which travel as a spherical wave at the speed of light. For the spin 2 case, in the absence of a local gauge invariant stress tensor, we probe these states with the Kretschmann scalar and show they represent localised curvature densities which travel at the speed of light. We consider the reduced density matrix of the half space with these excitations and develop methods which include a convenient gauge choice to evaluate the time dependence of Rényi/entanglement entropies as these quenches enter the half region. In all cases, the entanglement entropy grows in time and saturates at $\log 2 $. In the limit, the width of these excitations tends to zero, the growth is determined by order $2s+1$ polynomials in the ratio of the distance from the co-dimension-2 entangling surface and time. The polynomials corresponding to quenches created by the fields can be organised in terms of their representations under the $SO(2)_T\times SO(2)_L$ symmetry preserved by the presence of the co-dimension 2 entangling surface. For fields transforming as scalars under this symmetry, the order $2s+1$ polynomial is completely determined by the spin.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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