Expectation value of composite field $T{\bar T}$ in two-dimensional quantum field theory
Abstract
Description
I show that the expectation value of the composite field $T{\bar T}$, built from the components of the energy-momentum tensor, is expressed exactly through the expectation value of the energy-momentum tensor itself. The relation is derived in two-dimensional quantum field theory under broad assumptions, and does not require integrability.
12 pages
12 pages