## Jorge Laraña Aragon

Math Phys seminar

**Speaker: Jorge Laraña Aragon,University of Stockholm**

**Title: Quenched coupling, effective thermalization and evanescence in the free $O(N)$ vector model**

Room: VR-II, V-156

Time: Thursday 15th August, 14:00hrs

#### Abstract:

In this project we study two coupled free $O(N)$ vector models implementing the coupling via a quench of mixing. Since the theory is integrable pure thermalization does not occur but the quantum modes thermalize independently. Generalized thermal behavior is obtained at late times in the limit of weak initial mixing. We investigate this from both the effective density matrix and the spectral density function. When computing the latter, we observe that late-time correlation functions of composite operators in the post-quench free QFT surprisingly share interesting properties with correlators in strongly coupled systems. We discuss a possible holographic interpretation in terms of the so called evanescent modes.