Speaker
Description
The dissipative Sachdev-Ye-Kitaev (SYK) model has recently emerged as a paradigmatic toy model of strongly interacting open quantum systems coupled to a Markovian bath, whose dynamics is governed by a Lindblad master equation. The Keldysh double-contour technique allows for analytical progress in the limit of a large number of fermion flavours, by mapping the path integral of the open SYK model to that of two coupled non-Hermitian SYK systems, where thermal phase transitions between black hole and wormhole phases have been identified. While dynamical phase transitions between such phases were previously studied, a systematic investigation of the possible phases and their symmetry properties remained unexplored. Here, we address this problem by solving the Schwinger–Dyson equations derived from the Keldysh path integral across all possible symmetry sectors, thus clarifying the nature of these phases and the patterns of symmetry breaking that underpin relaxation dynamics.