Dartmouth Events

Physics & Astronomy Colloquium - Prof. Victor Galitski, University of Maryland

Title: "Many-Body Quantum Chaos and Emergence of Statistical Mechanics"

Friday, February 17, 2023
3:30pm – 4:30pm
Wilder 104 & Zoom
Intended Audience(s): Public
Categories: Arts and Sciences, Lectures & Seminars

Abstract: Both our everyday experience and laboratory experiments indicate that physical systems, initiallyprepared in a non-equilibrium state, time-evolve into thermal equilibrium. Sets of axioms havebeen formulated to justify this generic behavior and the emergence of statistical mechanics. Yet,there is no clear understanding of the fundamental principles underlying the universality ofthermalization and ergodicity. How do such irreversible thermal states emerge in quantumsystems, which are governed by the “reversable” unitary laws of quantum physics?This talk will review recent work on this topic and the closely related field of many-bodyquantum chaos. It will first introduce the basic notions of classical and quantum chaos in single-particle systems. We will consider different facets of quantum chaoticity such as universaldistribution of energy levels and the quantum butterfly effect. Then, the concept of many-bodyquantum chaos will be defined using the former approach rooted in celebrated random matrixtheory. It will be briefly discussed how this theory can be derived from first principles, whichwill lead to a surprising observation that small non-unitary perturbations strongly affect theresulting theory. It suggests the key conclusion of our recent work that spontaneous breaking ofunitarity may be responsible for the emergence of chaos in interacting many-body systems.

Hosted by Professor Rufus Boyack

Please click the link below to join the webinar:
Passcode: Physics


For more information, contact:
Tressena Manning

Events are free and open to the public unless otherwise noted.