др Михаило Чубровић

25. фебруара 2022.

У оквиру семинара Центра за изучавање комплексних система Института за физику у Београду, у четвртак, 03. марта 2022. године у 14 часова путем Zoom платформе, др Михаило Чубровић (Лабораторија за примену рачунара у науци, Центар за изучавање комплексних система, Институт за физику у Београду), одржаће предавање:

Quantum chaos, gravity and factorization (part 2)


In this talk we will argue that the factorization of partition functions in ensembles of interacting quantum systems is a fundamental measure of chaos for a broad range of strongly and weakly interacting, few- and many-body examples. We will first introduce the factorization puzzle in the context of recent advances from the black hole information literature: the problem is likely solved if the black hole geometry is corrected by spacetime wormholes, but wormholes imply that the partition function of two independent, mutually non-interacting and non-entangled systems does not equal the product of their separate partition functions. Making use of a matrix (IKKT) model of D-branes in type IIB string theory, we will show that the factorization is restored when half-wormholes and in general fractional wormholes are taken into account, which corresponds to the regime of strong microscopic chaos on D-branes. Afterwards we will consider the opposite case: ensembles of few-body quantum mechanical systems (Schroedinger equation in the Henon-Heiles potential, quantum kicked top, random matrices) factorize into products of individual partition functions when the system is quantum-chaotic and obeys the Wigner-Dyson energy level statistics. At the end, we will discuss potential applications to strongly correlated electron systems, which bring some new difficulties because of exchange correlations brought about by Fermi statistics.

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Meeting ID: 832 1825 2482
Passcode: 282961