Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: Dynamics in many-body systems: Equilibration and localization I (joint session DY/TT)

TT 7.1: Vortrag

Montag, 1. April 2019, 10:00–10:15, H19

Modern Principles of Equilibration in Closed Quantum Systems do Not Rule Out Strange Relaxation Dynamics — Lars Knipschild and •Jochen Gemmer — Universität Osnabrück, Germany

The quest for equilibration and thermalization in closed quantum systems has stimulated vast scientific effort, especially in the last decades. Various principles and approaches have been put forth, such as the eigenstate thermalization hypothesis, quantum chaos, typicality, the non-resonance principle, the unfeasibility of fine-tuned initial states, etc. While these approaches are well suited to explain that observables will assume specific "equilibrium" values for most points in time in between some initial time and a very distant future, they do not address the concrete dynamics towards these values. Furthermore they do not rule out substantial observable revivals on relevant timescales . We demonstrate that indeed very unexpected dynamics may result for systems and observables complying with all the above principles. This occurs for a very large set of non-fine tuned initial states.