String-Theory-Based Predictions for Nonhydrodynamic Collective Modes in Strongly Interacting Fermi Gases

TL;DR

This paper uses string theory to predict non-hydrodynamic collective modes in strongly interacting Fermi gases, proposing tests with current cold atom experiments to explore beyond hydrodynamic behavior.

Contribution

It introduces a novel approach to predict non-hydrodynamic modes in Fermi gases using string theory, extending the understanding of strongly interacting quantum systems.

Findings

Predicted new non-hydrodynamic collective modes in Fermi gases.

Proposed experimental tests for these modes using cold atom setups.

Linked behaviors of different strongly interacting systems beyond hydrodynamics.

Abstract

Very different strongly interacting quantum systems such as Fermi gases, quark-gluon plasmas formed in high energy ion collisions and black holes studied theoretically in string theory are known to exhibit quantitatively similar damping of hydrodynamic modes. It is not known if such similarities extend beyond the hydrodynamic limit. Do non-hydrodynamic collective modes in Fermi gases with strong interactions also match those from string theory calculations? In order to answer this question, we use calculations based on string theory to make predictions for novel types of modes outside the hydrodynamic regime in trapped Fermi gases. These predictions are amenable to direct testing with current state-of-the-art cold atom experiments.