Introducing local quenches in massive scalar field theory

We will study operator local quenches in the simplest extension to the non-conformal case — massive scalar field theory. We consider the dynamics of excited local states in an arbitrary spacetime dimension and generalize the well-known two-dimensional CFT results. We derive the energy density, U(1)-charge density and $\phi^2(x)$-condensate post-quench dynamics, and identify different regimes of their evolution depending on the values of the field mass and the UV regularization parameter. For local quenches in higher-dimensional free massless scalar theories, we reproduce the structure of the available holographic results. We also investigate the local quenches in massive scalar field theory on a cylinder and show that they cause an erratic and chaotic-like evolution of observables with a complicated localization-delocalization pattern.