Velocity of sound beyond the high-density relativistic limit from lattice simulation of dense two-color QCD-Reference-Cited by-同舟云学术

Velocity of sound beyond the high-density relativistic limit from lattice simulation of dense two-color QCD

Published:2022-10-21 Issue:11 Volume:2022 Page:
ISSN:2050-3911
Container-title:Progress of Theoretical and Experimental Physics
language:en
Short-container-title:

Author:

Iida Kei¹,Itou Etsuko²³⁴^ORCID

Affiliation:

1. Department of Mathematics and Physics, Kochi University , 2-5-1 Akebono-cho, Kochi 780-8520, Japan

2. Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) , RIKEN, Wako 351-0198, Japan

3. Department of Physics, and Research and Education Center for Natural Sciences , Keio University, 4-1-1 Hiyoshi, Yokohama, Kanagawa 223-8521, Japan

4. Research Center for Nuclear Physics (RCNP), Osaka University , Osaka 567-0047, Japan

Abstract

Abstract We obtain the equation of state (EoS) for two-color quantum chromodynamics (QCD) at low temperature and high density from the lattice Monte Carlo simulation. We find that the velocity of sound exceeds the relativistic limit ($c_s^2/c^2=1/3$) after BEC-BCS (Bose-Einstein condensation–Bardeen–Cooper–Schrieffer) 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.

Funder

Japan Society for the Promotion of Science

SCOAP

Publisher

Oxford University Press (OUP)

Subject

General Physics and Astronomy

Link

https://academic.oup.com/ptep/advance-article-pdf/doi/10.1093/ptep/ptac137/46595560/ptac137.pdf

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1. Color superconductivity in dense quark matter

2. Hadron–quark crossover and massive hybrid stars