# The 39th International Symposium on Lattice Field Theory (Lattice 2022)

Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

## Bump of sound velocity in dense 2-color QCD

Aug 11, 2022, 12:10 PM
20m
CP1-HSZ/Ground-0.011 - HS1 (CP1-HSZ)

### CP1-HSZ/Ground-0.011 - HS1

#### CP1-HSZ

450
Oral Presentation QCD at Non-zero Density

### Speaker

Etsuko Itou (RIKEN)

### Description

We obtain the equation of state ($p$ vs. $e$) and the sound velocity ($c_s^2/c^2 = \partial p/\partial e$) for two-color QCD at low temperature and high density and find that in the superfluid phase, $c_s^2/c^2$ becomes larger than $1/3$, which is the value at the relativistic limit. Several independent Monte Carlo studies on $2$-color QCD have been conducted intensively in recent years, and have found clear evidence of phase transition between hadronic and superfluid phases.
Our result is consistent with several recent works based on effective models which have shown the peak of sound velocity.

### Primary authors

Etsuko Itou (RIKEN) Prof. Kei Iida (Department of Mathematics and Physics, Kochi University)