Finite temperature expectation values of boundary operators

Understand

A conjecture is presented for the thermal one-point function of boundary operators in integrable boundary quantum field theories in terms of form factors.

• It is expected to have applications in studying boundary critical phenomena and boundary flows, which are relevant in the context of condensed matter and string theory.
• The conjectured formula is verified by a low-temperature expansion developed using finite size techniques, which can also be used to evaluate higher point functions both in the bulk and on the boundary.