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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2504.08926 |
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| _version_ | 1866911126251372544 |
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| author | Zastrow, João V. Pereira, Jonas P. de Lima, Rafael C. R. Horvath, Jorge E. |
| author_facet | Zastrow, João V. Pereira, Jonas P. de Lima, Rafael C. R. Horvath, Jorge E. |
| contents | (Abridged) Neutron stars (NSs), the densest known objects composed of matter, provide a unique laboratory to probe whether strange quark matter is the true ground state of matter. We investigate the parameter space of the equation of state of strange stars using a quantum chromodynamics (QCD)-informed model. The parameters - related to the energy density difference between quark matter and the QCD vacuum, the strength of strong interactions, and the gap parameter for color superconductivity - are sampled via quasi-random Latin hypercube sampling to ensure uniform coverage. To constrain them, we incorporate observational data on the maximum mass of NSs (from binary and merger systems), the radii of $1.4$ M$_{\odot}$ NSs (from gravitational wave and electromagnetic observations), and tidal deformabilities (from GW170817). Our results show that quark strong interactions play a key role, requiring at least a $20\%$ deviation from the free-quark limit. We also find that color superconductivity is relevant, with the gap parameter reaching up to $\sim 230$ MeV for a strange quark mass of $100$ MeV. The surface-to-vacuum energy density jump lies in the range $(1.1-2.2)$ $ρ_{\rm{sat}}$, where $ρ_{\rm{sat}} \simeq 2.7 \times 10^{14}$ g cm$^{-3}$. Observational constraints also imply that a $1.4$ M$_{\odot}$ quark star has a radius of $(10.0-12.3)$ km and tidal deformability between $270$ and $970$. These are consistent with the low mass and radius inferred for the compact object XMMU J173203.3-344518. Our results provide useful inputs for future studies on quark and hybrid stars, including their tidal properties, thermal evolution, quasi-normal modes, and ellipticities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_08926 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Constraints on QCD-based equation of state of quark stars from neutron star maximum mass, radius, and tidal deformability observations Zastrow, João V. Pereira, Jonas P. de Lima, Rafael C. R. Horvath, Jorge E. High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology (Abridged) Neutron stars (NSs), the densest known objects composed of matter, provide a unique laboratory to probe whether strange quark matter is the true ground state of matter. We investigate the parameter space of the equation of state of strange stars using a quantum chromodynamics (QCD)-informed model. The parameters - related to the energy density difference between quark matter and the QCD vacuum, the strength of strong interactions, and the gap parameter for color superconductivity - are sampled via quasi-random Latin hypercube sampling to ensure uniform coverage. To constrain them, we incorporate observational data on the maximum mass of NSs (from binary and merger systems), the radii of $1.4$ M$_{\odot}$ NSs (from gravitational wave and electromagnetic observations), and tidal deformabilities (from GW170817). Our results show that quark strong interactions play a key role, requiring at least a $20\%$ deviation from the free-quark limit. We also find that color superconductivity is relevant, with the gap parameter reaching up to $\sim 230$ MeV for a strange quark mass of $100$ MeV. The surface-to-vacuum energy density jump lies in the range $(1.1-2.2)$ $ρ_{\rm{sat}}$, where $ρ_{\rm{sat}} \simeq 2.7 \times 10^{14}$ g cm$^{-3}$. Observational constraints also imply that a $1.4$ M$_{\odot}$ quark star has a radius of $(10.0-12.3)$ km and tidal deformability between $270$ and $970$. These are consistent with the low mass and radius inferred for the compact object XMMU J173203.3-344518. Our results provide useful inputs for future studies on quark and hybrid stars, including their tidal properties, thermal evolution, quasi-normal modes, and ellipticities. |
| title | Constraints on QCD-based equation of state of quark stars from neutron star maximum mass, radius, and tidal deformability observations |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2504.08926 |