Work

Deconfinement in neutron stars by Color-Spin-Molecular-Dynamics

Year: 2025

Type: conference-paper

Abstract: We focus on the equation of state in neutron stars with the color-spin molecular dynamics. This is based on the constituent quark model, and reproduces the quark confinement/deconfinement phenomena by solving the degrees of freedom of color and spin for each quark. The equation of state for dense matter is studied, and it replicates the saturation properties: symmetric energy, $L$-parameter, and incompressibility around nuclear density. The resultant mass-radius relations are consistent with the observations such as the gravitational wave observations, NICER etc. Our numerical results suggest that de-confined quark matter appears in the core of neutron stars via crossover. Although the current constraints from the observations are not enough to conclude whether quark matter appears at high-density region, our method would help to understand high-density material properties inside neutron stars in the future.

DOI: 10.22323/1.483.0221

Authors: Nobutoshi Yasutake, "Toshiki Maruyama"

Institutions: Japan Atomic Energy Agency, Advanced Science Research Center

Language: English

Topic: Pulsars and Gravitational Waves Research

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Funders: Japan Society for the Promotion of Science, Japan Atomic Energy Agency

Award: Derivation of high-density thermodynamic quantities by long-time large-scale computation of color molecular dynamics

OpenAlex ID: W4415518585

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