Long lived quasi normal modes

TL;DR

This paper investigates magnetically charged AdS black branes and finds that strong Chern-Simons coupling leads to long-lived quasi-normal modes, suggesting observable long-lived excitations in the boundary theory.

Contribution

It demonstrates that large Chern-Simons coupling causes quasi-normal modes to have diminishing imaginary parts, indicating long-lived modes regardless of matter content.

Findings

Quasi-normal modes become long-lived with increasing Chern-Simons coupling.

Long-lived modes are expected to be observable in the boundary theory.

Result is independent of the matter content of the bulk theory.

Abstract

We consider magnetically charged AdS black branes with vanishing entropy at zero temperature. We argue that in the presence of a large enough Chern-Simons coupling the quasi normal modes of the brane will have a diminishing imaginary part. Since our result is agnostic to the matter content of the theory it implies that, generically, the boundary theory will possess long lived modes which should be observable in a proper setting.