Non-equilibrium dynamics after quenches in quantum field theories

Quantum field theories can be taken out of equilibrium by an abrupt excitation, which is called quantum quench. A particular mechanism of how the excitation is introduced may be different. One type of quenches assumes global modification of a quantum system by the change of field parameters. Probing the evolution of perturbations after the quench reveals dynamical features of the system which cannot be observed in the equilibrium regime. We study examples of global quenches in the exotic fracton quantum field theory, as well as elaborate on the dynamics in the ordinary relativistic quantum field theory but with finite-size background geometry.