Quarkyonic matter with strangeness in an extended RMF model
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866908785542430720 |
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| author | Sun, Wei Xia, Cheng-Jun Sun, Ting-Ting |
| author_facet | Sun, Wei Xia, Cheng-Jun Sun, Ting-Ting |
| contents | Quarkyonic matter is expected to play a key role for the transition from hadronic matter to quark matter in compact stars. Within the framework of the relativistic mean field (RMF) model and equivparticle model with density-dependent quark masses, we construct the ``quark Fermi sea" with a ``baryon Fermi surface" to characterize the properties of the quarkyonic matter. In particular, we develop a comprehensive framework to account for the strangeness degrees of freedom, incorporating $Λ$, $Ξ$, and $Σ$ hyperons as well as strange quarks in a unified quarkyonic framework. Our calculations indicate that the inevitable emergence of hyperons softens the equations of state, leading to a reduction in the speed of sound around $n_{\rm b}\approx 2n_0$, and consequently reducing the masses and radii of neutron stars. When the quark-hadron phase transition is taken into account, the equation of state at high densities exhibits additional softening, leading to a maximum sound velocity of $v_{\rm max} \approx 0.6\,c$, which is close to the ultrarelativistic limit of $0.58\,c$, consistent with current astronomical observational constraints. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_17300 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quarkyonic matter with strangeness in an extended RMF model Sun, Wei Xia, Cheng-Jun Sun, Ting-Ting Nuclear Theory High Energy Physics - Phenomenology Quarkyonic matter is expected to play a key role for the transition from hadronic matter to quark matter in compact stars. Within the framework of the relativistic mean field (RMF) model and equivparticle model with density-dependent quark masses, we construct the ``quark Fermi sea" with a ``baryon Fermi surface" to characterize the properties of the quarkyonic matter. In particular, we develop a comprehensive framework to account for the strangeness degrees of freedom, incorporating $Λ$, $Ξ$, and $Σ$ hyperons as well as strange quarks in a unified quarkyonic framework. Our calculations indicate that the inevitable emergence of hyperons softens the equations of state, leading to a reduction in the speed of sound around $n_{\rm b}\approx 2n_0$, and consequently reducing the masses and radii of neutron stars. When the quark-hadron phase transition is taken into account, the equation of state at high densities exhibits additional softening, leading to a maximum sound velocity of $v_{\rm max} \approx 0.6\,c$, which is close to the ultrarelativistic limit of $0.58\,c$, consistent with current astronomical observational constraints. |
| title | Quarkyonic matter with strangeness in an extended RMF model |
| topic | Nuclear Theory High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2601.17300 |