# Exploring the influence of bulk viscosity of QCD on dilepton tomography

## TL;DR

This paper investigates how the bulk viscosity of QCD affects dilepton production in heavy-ion collisions, aiming to use dileptons as probes to constrain the medium's transport properties, especially bulk viscosity.

## Contribution

It explores the sensitivity of dilepton yields to the bulk viscosity of QCD matter, providing insights into their potential as probes for the medium's transport coefficients.

## Key findings

- Dilepton production is sensitive to the bulk viscosity of QCD.
- Bulk viscosity influences the evolution dynamics of the quark-gluon plasma.
- Dileptons can serve as effective probes to constrain bulk viscosity in heavy-ion collisions.

## Abstract

The collective behavior of hadrons and of electromagnetic radiation in heavy-ion collisions has been widely used to study the properties of the the Quark-Gluon Plasma (QGP). Indeed this collectivity, as measured by anisotropic flow coefficients, can be used to constrain the transport properties of QGP. The goal of this contribution is to investigate the influence of the specific bulk viscosity ($\zeta/s$) on dilepton production, both at Relativistic Heavy-Ion Collider (RHIC) and Large Hadron Collider (LHC) energies. We explore the sensitivity of dileptons to dynamical features that bulk viscosity induces on the evolution of a strongly-interacting medium, and highlight what makes them a valuable probe in the pursuit to also constrain $\zeta/s$.