Maths HEP Lunchtime Seminars: Time-dependence of correlation functions following a quantum quench
3 March 2006 13:00 in CM221
"Suppose that an extended quantum system in d dimensions is prepared at time t=0 in the ground state of some hamiltonian H_0 but then evolves unitarily according to some other hamiltonian H. How do the correlation functions of local operators evolve? In this talk I show that partcularly powerful results are available when d=1 and H corresponds to a conformal field theory. These are checked against explicit results from some solvable models. They are consistent with a physical picture, valid more generally, whereby quasiparticles, entangled in the initial state, then propagate semi-classically. "