Date: 14 JUNE 2022 from 15:00 to 16:00
Event location: In presence and online event
We develop a truncated Hamiltonian method to investigate the dynamics of the (1 +1 ) -dimensional ϕ4 theory following quantum quenches. The results are compared to two different semiclassical approaches, the self-consistent Gaussian approximation and the truncated Wigner approximation, and used to determine the range of validity of these widely used approaches. Aside from establishing the truncated Hamiltonian approach as a powerful tool for studying the dynamics of the ϕ4 model, our results on the limitation of semiclassical approximations are expected to be relevant for modeling the dynamics of other quantum field theories.