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IQIM Postdoctoral and Graduate Student Seminar

Friday, October 16, 2020
11:00am to 12:00pm
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Scrambling and Branching
Yingfei Gu, IFQ Postdoctoral Scholar in Theoretical Physics, Kitaev Group,

Abstract: Out-of-time-order correlators (OTOCs) describe quantum chaos in a way comparable to classical chaos, at least for systems with a large parameter N, where the early-time OTOCs are characterized by a Lyapunov exponent, whose inverse defines a time scale known as Lyapunov time. In this talk, I will discuss another time scale called branching time and derive a bound on it for SYK-like models. It turns out that the branching time plays significantly different roles in the strong and weak coupling limits, suggesting two different mechanisms for scrambling. This talk is based on [1812.00120] with Alexei Kitaev and work in progress with Alexei Kitaev and Pengfei Zhang.

Attend the talk at: https://caltech.zoom.us/j/97280252054

Talks will also be posted on IQIM's YouTube page https://www.youtube.com/channel/UC5TeDDv2O31r8B47iEUEgNQ

For more information, please contact Marcia Brown by phone at 626-395-4013 or by email at marciab@caltech.edu.