Classification of out-of-time-order correlators
- Author(s): Haehl, FM;
- Loganayagam, R;
- Narayan, P;
- Rangamani, M
- et al.
Published Web Locationhttps://doi.org/10.21468/SciPostPhys.6.1.001
The space of n-point correlation functions, for all possible time-orderings of operators, can be computed by a non-trivial path integral contour, which depends on how many time-ordering violations are present in the correlator. These contours, which have come to be known as timefolds, or out-of-time-order (OTO) contours, are a natural generalization of the Schwinger-Keldysh contour (which computes singly out-of-time-ordered correlation functions). We provide a detailed discussion of such higher OTO functional integrals, explaining their general structure, and the myriad ways in which a particular correlation function may be encoded in such contours. Our discussion may be seen as a natural generalization of the Schwinger-Keldysh formalism to higher OTO correlation functions. We provide explicit illustration for low point correlators (n ≤ 4) to exemplify the general statements.