Fluctuations in non-conformal holographic plasma at criticality

Understand

We continue the study initiated in [arXiv:1708.02252] of the fluctuations of a strongly-coupled non-conformal plasma described holographically by Einstein gravity coupled to a dilaton with an exponential potential.

• The plasma approaches a critical point of a continuous phase transition in a specific limit, where the metric becomes a linear-dilaton background.
• This results to an analytic description of the quasi-normal mode spectrum, that can be extended perturbatively in the deviation away from the critical point.
• In the previous paper we showed that at criticality the quasinormal frequencies coalesce into a branch cut on the real axis.