# Extreme QCD 2017 - The 15th international workshop on QCD in eXtreme conditions

26-28 June 2017
Europe/Rome timezone

## Neutral pion matter in strong magnetic fields

28 Jun 2017, 15:35
25m
talk

### Speaker

Tomas Brauner (University of Stavanger)

### Description

The ground state of QCD in sufficiently strong external magnetic fields and at moderate baryon chemical potential is a chiral soliton lattice (CSL) of neutral pions. This is a model-independent result based on low-energy effective field theory, and the magnetic fields and baryon densities required may occur in the cores of neutron stars. The spectrum of excitations above the CSL ground state contains a soft, nonrelativistic mode that gives an anomalous contribution to pressure, scaling with temperature and magnetic field as $T^{5/2}B^{3/2}$. Finally, I will argue that in stronger but still achievable magnetic fields, the neutral pion CSL background may catalyze Bose-Einstein condensation of charged pions.

### Primary author

Tomas Brauner (University of Stavanger)

### Presentation Materials

 Slides Video