Flavors in an expanding plasma

TL;DR

This paper investigates how an expanding plasma influences probe matter using holographic duality, analyzing chiral condensates and meson spectra with viscosity effects included, revealing new viscosity-related contributions.

Contribution

It introduces a method to compute time-dependent meson spectra in an expanding plasma, incorporating viscosity effects and extending static holographic models.

Findings

Chiral condensate aligns with static black hole expectations.

Meson spectra are consistent with adiabatic approximation.

Viscosity introduces new effects in vector meson spectra.

Abstract

We consider the effect of an expanding plasma on probe matter by determining time-dependent D7 embeddings in the holographic dual of an expanding viscous plasma. We calculate the chiral condensate and meson spectra including contributions of viscosity. The chiral condensate essentially confirms the expectation from the static black hole. For the meson spectra we propose a scheme that is in agreement with the adiabatic approximation. New contributions arise for the vector mesons at the order of the viscosity terms.