Speaker
Description
We obtain the equation of state (EoS) for two-color QCD at low
temperature and high density from the lattice Monte Carlo simulation.
Two-color QCD is a good toy model of a real three-color QCD. The advantage
to study this model is that the sign problem is absent even in a finite
density regime because of the pseudo-reality of the quark field. We find
that the speed of sound exceeds the conformal bound (c_s^2/c^2=1/3)
after BEC-BCS crossover in the superfluid phase. Such an excess of the
sound velocity is previously unknown from any lattice calculations for
QCD-like theories. This finding might have a possible relevance to the
EoS of neutron star matter revealed by recent measurements of neutron
star masses and radii. This talk is based on PTEP 2022 (2022) 11, 111B01
(e-Print: 2207.01253).
| Topical area | QCD at Non-zero Density |
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