#### Hall 123

#### Counting Out of Time Order

#### R Loganayagam

##### ICTS

*Out of time ordered correlators have increasingly shown up as good probes of physics in many physical *

systems - from black holes to many body localised states. But, a systematic understanding of the space of

all out of time ordered correlators is still lacking. In this talk, I will describe our recent work

[ arxiv.org/abs/1701.02820 ] to construct

a framework of classifying how out of time order a given correlator is. This journey will also take us through

interesting mathematical alleys of counting peak permutations or how to systematically think about the

vector space of super-Jacobi identities.

Done