Symmetry Energy Expansion with Strange Dense Matter

2025/04/26 by Yumu Yang, Nikolas Cruz-Camacho, Yang, Yumu +7 · 1 voice · 2 citations
Physics and Astronomy · #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Nuclear physics research studies #Pulsars and Gravitational Waves Research #astro-ph.HE #hep-ph #nucl-th

paper · pdf · doi:10.48550/arxiv.2504.18764

openalex publication_date 2025/04/26 · arxiv published 2025/04/26 · openalex created_date 2025/10/10 · arxiv updated 2026/04/20 · openalex updated_date 2026/07/28

Abstract

The quantum chromodynamics (QCD) phase diagram at large densities and low temperatures can be probed using both neutron stars and low-energy heavy-ion collisions. Heavy-ion collisions are nearly isospin-symmetric systems, whereas neutron stars are highly isospin asymmetric since they are neutron-rich. The symmetry-energy expansion is used to connect these regimes across isospin asymmetry. However, the current symmetry-energy expansion does not account for strange particles. In this work, we include finite strangeness by redefining the isospin-asymmetry parameter and the symmetry-energy expansion in a way that is consistent with QCD SU(3) flavor symmetry. Our new symmetry energy works well beyond typical neutron star central densities and admits a skewness term in the presence of strangeness for the case of weak equilibrium.

Cited by

• Symmetry energy expansion and the peak value of the bulk viscosity
• Neural-Accelerated Bayesian Calibration of Chiral Mean-Field Models to Nuclear Saturation and Vacuum Properties

Discussions

• How do you connect neutron stars and lab experiments of heavy-ion collisions? Both are on the same phase diagram of the strong force, but with different charge fractions so one uses the symmetry energ [bsky, 1 points, 1 comments]

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