skip to main content

High Energy Theory Seminar

Friday, February 23, 2024
11:00am to 12:00pm
Add to Cal
Online and In-Person Event
Emergence and breakdown of the membrane picture in Brownian models
Shreya Vardhan, Stanford University,

It has previously been observed that the evolution of entanglement entropies and OTOCs in systems ranging from random unitary circuits to holographic CFTs can be understood within a common framework known as the "membrane picture." In this talk, we consider a class of Brownian local evolutions, where the Lorentzian evolution of the system on multiple copies can be equivalently described by Euclidean evolution with a "superhamiltonian" on multiple copies. We identify generic properties of the low-energy modes of the superhamiltonian which lead to the emergence of the membrane picture. We further discuss the breakdown of the membrane picture in integrable systems and systems with conserved quantities due to differences in the low-energy spectrum of the superhamiltonian. 

The talk is in 469 Lauritsen.

Contact [email protected] for Zoom information.