Locating the QCD critical point with neutron-star observations
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866909646251360256 |
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| author | Ecker, Christian Jokela, Niko Järvinen, Matti |
| author_facet | Ecker, Christian Jokela, Niko Järvinen, Matti |
| contents | We present a probabilistic model for the QCD critical endpoint (CEP) and the equation of state (EOS) at $β$-equilibrium, constrained by neutron-star observations. Using a hybrid framework that combines the holographic V-QCD model with an effective van der Waals description of nuclear matter, we generate a large ensemble of EOSs incorporating nuclear theory uncertainties. Constraining this ensemble with neutron-star mass-radius data and tidal deformability measurements from gravitational waves, we identify a strong first-order deconfinement transition at zero temperature, with a transition strength of $Δn_{\rm{PT}}/n_0 = 3.75^{+0.70}_{-0.53}$ and onset density $n_{\rm{PT}}/n_0 = 4.9^{+1.33}_{-1.17}$. The resulting posterior yields $95\%$ credible intervals for the CEP location: $μ_{\rm{crit}} = 626^{+90}_{-179}\,\rm{MeV}$, $T_{\rm{crit}} = 119^{+14}_{-6}\,\rm{MeV}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_10065 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Locating the QCD critical point with neutron-star observations Ecker, Christian Jokela, Niko Järvinen, Matti High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory Nuclear Theory We present a probabilistic model for the QCD critical endpoint (CEP) and the equation of state (EOS) at $β$-equilibrium, constrained by neutron-star observations. Using a hybrid framework that combines the holographic V-QCD model with an effective van der Waals description of nuclear matter, we generate a large ensemble of EOSs incorporating nuclear theory uncertainties. Constraining this ensemble with neutron-star mass-radius data and tidal deformability measurements from gravitational waves, we identify a strong first-order deconfinement transition at zero temperature, with a transition strength of $Δn_{\rm{PT}}/n_0 = 3.75^{+0.70}_{-0.53}$ and onset density $n_{\rm{PT}}/n_0 = 4.9^{+1.33}_{-1.17}$. The resulting posterior yields $95\%$ credible intervals for the CEP location: $μ_{\rm{crit}} = 626^{+90}_{-179}\,\rm{MeV}$, $T_{\rm{crit}} = 119^{+14}_{-6}\,\rm{MeV}$. |
| title | Locating the QCD critical point with neutron-star observations |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory Nuclear Theory |
| url | https://arxiv.org/abs/2506.10065 |