High Energy Theory Seminar

I consider properties of the return amplitude $F(t)=\\langle\\Psi(t)|\\Psi(0)\\rangle$ following a quantum quench in a CFT on a finite manifold $M$ of dimension $d-1$ from a state $|\\Psi(0)\\rangle$ with area-law entanglement. In particular I'll discuss the initial decay behavior of $F$, common to all CFTs, and the occurrence of revivals at which $F=O(1)$ for rational CFTs in $d=2$ and free scalar fields