# Quark Matter 2019 - the XXVIIIth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions

3-9 November 2019
Wanda Reign Wuhan Hotel
Asia/Shanghai timezone

## Kinetics and hydrodynamics close to the chiral limit

4 Nov 2019, 17:40
20m
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

#### Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation New theoretical developments

### Speaker

Derek Teaney (Stony Brook University)

### Description

First, we recall that close to the chiral limit, and below the critical temperature, the long wavelength effective theory of QCD is not ordinary hydrodynamics, but SU(2)xSU(2) superfluid hydrodynamics (Son 2000). In this theory the usual hydrodynamic variables such as energy are momentum are augmented by long wavelength pions. When the pion is massive, the effective theory reduces to normal hydrodynamics at large distances, but is described by the superfluid theory at short distances. Using techniques developed by Akamatsu et al (Akamatsu 2017), we integrate out the superfluid modes to determine how the transport coefficients of QCD such as the bulk viscosity depend on the pion mass below the critical temperature. These expressions are given by the dissipative parameters in the superfluid theory. We show how to compute these parameters in chiral perturbation theory using the associated chiral kinetic theory.

References:

D. Son, Hydrodynamics of nuclear matter in the chiral limit,'' Phys. Rev. Lett. 84, 3771 (2000).

Y. Akamatsu, A. Mazeliauskas and D. Teaney, A kinetic regime of hydrodynamic fluctuations and long time tails for a Bjorken expansion,'' Phys.\ Rev. C95, no. 1, 014909 (2017).

### Primary authors

Derek Teaney (Stony Brook University) Juan M Torres-Rincon (Stony Brook University) FANGLIDA YAN (Stony Brook University)

### Presentation Materials

There are no materials yet.