Schrödinger functional

The Schrödinger functional is an object that arises in quantum field theory, particularly in the context of defining quantum theories in a way that is amenable to mathematical treatment. It is a specific type of functional that can be used to describe the quantum states of a field theory in a way that facilitates the analysis of its properties. In general, the Schrödinger functional is defined in terms of a functional integral formulation of quantum mechanics and is often used when discussing the path integral approach.