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arXiv 2103.00824hep-th
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重参数化模式沃德恒等式与高阶混沌。CFT $_2$中的关联函数

Reparametrization mode Ward Identities and chaos in higher-pt. correlators in CFT$_2$

Arnab Kundu, Ayan K. Patra, Rohan R. Poojary

摘要:

最近引入的CFTs中的重参数化模式算子已被证明可以控制应力张量相互作用$via$的影子算子形式主义,似乎可以控制混沌系统的有效动力学。我们开始研究的沃德恒等式的重新参数化模式运营商$i.e.$如何二维CFT沃德恒等式管理的行为插入的重新参数化模式$ε$的相关函数:$\langleεεϕϕ\rangle$。我们发现,在半经典极限的大$c$,他们决定领先的$\mathcal{O}(c^{-1})$行为。虽然对于$4$ pt函数,这再现了Heahl,Reeves \& Rozali在\cite{Haehl:2019eae}中所做的相同计算,但在成对相等算子的6pt函数的情况下,这提供了计算应力张量梳状通道中的Virasoro块的替代方式。我们计算一个最大的时间有序的相关函数在热背景下,并找到预期的行为的指数增长所支配的李雅普诺夫指数$λ_L=2π/β$持续的两倍的扰频时间的系统$t^*=\fracβ{2π}\log\,c$的最大编织型的$out$ - $of$ - $time$ - $ordering$。然而,当只有梳状通道的内部算子是\emph{out-of-time-ordered}时,尽管包含Virasoro贡献,相关器也看不到指数行为。从散装的角度来看,\emph{out-of-time-ordered} $4$ pt功能,我们发现,Casimir方程的应力张量块再现线性化的反反应在散装。

英文摘要:

Recently introduced reparametrization mode operators in CFTs have been shown to govern stress tensor interactions $via$ the shadow operator formalism and seem to govern the effective dynamics of chaotic systems. We initiate a study of Ward identities of reparametrization mode operators $i.e.$ how two dimensional CFT Ward identities govern the behaviour of insertions of reparametrization modes $ε$ in correlation functions: $\langleεεϕϕ\rangle$. We find that in the semi-classical limit of large $c$ they dictate the leading $\mathcal{O}(c^{-1})$ behaviour. While for the $4$pt function this reproduces the same computation as done by Heahl, Reeves \& Rozali in \cite{Haehl:2019eae}, in the case of 6pt function of pair-wise equal operators this provides an alternative way of computing the Virasoro block in stress-tensor comb channel. We compute a maximally out of time ordered correlation function in a thermal background and find the expected behaviour of an exponential growth governed by Lyapunov index $λ_L=2π/β$ lasting for twice the scrambling time of the system $t^*=\fracβ{2π}\log\,c$ for the maximally braided type of $out$-$of$-$time$-$ordering$. However when only the internal operators of the comb channel are \emph{out-of-time-ordered}, the correlator sees no exponential behaviour despite the inclusion of the Virasoro contribution. From a bulk perspective for the \emph{out-of-time-ordered} $4$pt function we find that the Casimir equation for the stress tensor block reproduces the linearised back reaction in the bulk.

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