Speaker
Máté Lencsés
(Wigner RCP)
Description
We study local quenches induced by boundary changing operators in the scaling Lee-Yang model. At the critical point, we provide explicit results for how the matrix element of a bulk field evolves between pre- and post-quench vacuum states. The quench effect propagates within a light-cone, indicating a finite velocity for the spread of information. When a bulk perturbation is added, the model becomes massive; here we use integrability to develop a boundary form factor expansion for the same quantity. In both cases, a light-cone effect is present: the vacuum-to-vacuum amplitude transitions from its value before the quench to that after the quench. We validate the form factor expansion through a Hamiltonian truncation method.
Authors
Dávid Fülepi
(University of Amsterdam)
Máté Lencsés
(Wigner RCP)
Zoltán Bajnok
(Wigner RCP)
