Spectral form factor in the double-scaled SYK model
arXiv:2011.01906 · doi:10.1007/JHEP03(2021)031
Abstract
In this note we study the spectral form factor in the SYK model in large limit at infinite temperature. We construct analytic solutions for the saddle point equations that describe the slope and the ramp regions of the spectral form factor time dependence. These saddle points are obtained by taking different approaches to the large limit: the slope region is described by a replica-diagonal solution and the ramp region is described by a replica-nondiagonal solution. We find that the onset of the ramp behavior happens at the Thouless time of order . We also evaluate the one-loop corrections to the slope and ramp solutions for late times, and study the transition from the slope to the ramp. We show this transition is accompanied by the breakdown of the perturbative expansion, and that the Thouless time is defined by the consistency of extrapolation of this expansion to late times.
34+9 pages, 14 figures. v2: added reference, published version
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