arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1705.03048hep-thcond-mat.stat-mechquant-ph
收藏

大N理论和引力中的De Finetti定理和纠缠

De Finetti theorems and entanglement in large-N theories and gravity

Javier M. Magan

摘要:

德菲内蒂定理及其扩展涉及具有某些对称性质的多部概率分布的结构,最初的范例是置换对称。这些定理断言,这样的对称分布很好地近似不相关的凸组合。在这篇文章中,我们将de Finetti定理应用到量子引力理论中,例如Sachdev-Ye-Kitaev(SYK)模型或大N矢量和规范理论。对于SYK,我们把最近的研究信息/纠缠动力学的一般和严格的基础。对于矢量和规范理论,我们找到了一个规范不变的运营商,其期望值提供了领先的长期在所有状态的纠缠熵足够接近一个给定的经典状态。这些结果可以统一通过一个通用的声明施密特分解和退相干的性质在大N理论。在相反的方向上,我们以各种方式扩展了de Finetti定理,并提供了一个独立的方法,仅基于规范不变相干群的大N性质的定理。

英文摘要:

The de Finetti theorem and its extensions concern the structure of multipartite probability distributions with certain symmetry properties, the paradigmatic original example being permutation symmetry. These theorems assert that such symmetric distributions are well approximated by convex combinations of uncorrelated ones. In this article, we apply de Finetti theorems to quantum gravity theories, such as the Sachdev-Ye-Kitaev (SYK) model or large-N vector and gauge theories. For SYK we put recent studies of information/entanglement dynamics in a general and rigorous basis. For vector and gauge theories, we find a gauge invariant operator whose expectation value provides the leading term in the entanglement entropy in all states close enough to a given classical state. These results can be unified through a generic statement about the nature of Schmidt decompositions and decoherence in large-N theories. In the reverse direction, we extend de Finetti theorems in various ways and provide an independent approach to the theorems only based on the large-N properties of the gauge invariant coherence group.

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。

↑