Local quenches and quantum chaos from higher spin perturbations

David, Justin R and Khetrapal, Surbhi and Kumar, Prem S (2017) Local quenches and quantum chaos from higher spin perturbations. In: JOURNAL OF HIGH ENERGY PHYSICS (10).

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Abstract

We study local quenches in 1+1 dimensional conformal field theories at large-c by operators carrying higher spin charge. Viewing such states as solutions in Chern-Simons theory, representing infalling massive particles with spin-three charge in the BTZ background, we use the Wilson line prescription to compute the single-interval entanglement entropy (EE) and scrambling time following the quench. We find that the change in EE is finite (and real) only if the spin-three charge q is bounded by the energy of the perturbation E, as vertical bar q vertical bar/c < E-2/c(2). We show that the Wilson line/EE correlator deep in the quenched regime and its expansion for small quench widths overlaps with the Regge limit for chaos of the out-of-time-ordered correlator. We further find that the scrambling time for the two-sided mutual information between two intervals in the thermo field double state increases with increasing spin-three charge, diverging when the bound is saturated. For larger values of the charge, the scrambling time is shorter than for pure gravity and controlled by the spin-three Lyapunov exponent 4 pi/beta. In a CFT with higher spin chemical potential, dual to a higher spin black hole, we find that the chemical potential must be bounded to ensure that the mutual information is a concave function of time and entanglement speed is less than the speed of light. In this case, a quench with zero higher spin charge yields the same Lyapunov exponent as pure Einstein gravity.

Item Type:	Journal Article
Publication:	JOURNAL OF HIGH ENERGY PHYSICS
Additional Information:	Copy right for this article belongs to the SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	17 Nov 2017 05:18
Last Modified:	17 Nov 2017 05:18
URI:	http://eprints.iisc.ac.in/id/eprint/58269

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