Speed of sound bounds and first-order phase transitions in compact stars
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arXiv
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| Format: | Preprint |
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2024
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| author | Laskos-Patkos, P. Lalazissis, G. A. Wang, Sibo Meng, Jie Ring, Peter Moustakidis, Ch. C. |
| author_facet | Laskos-Patkos, P. Lalazissis, G. A. Wang, Sibo Meng, Jie Ring, Peter Moustakidis, Ch. C. |
| contents | In the present study, we employ three distinct, physically motivated speed of sound bounds to construct hybrid models, where the high-density phase is described by the maximally stiff equation of state. In particular, we consider the bounds related to special relativity, relativistic kinetic theory and conformality. The low-density hadronic phase is described by a state-of-the-art microscopic relativistic Brueckner-Hartree-Fock theory. This work aims to access the effect of the different speed of sound constraints on the relevant parameter space of the key parameters of first-order phase transitions by utilizing recent astronomical data. This involves a systematic analysis that also includes two distinct schemes for the construction of hybrid models (abrupt and smooth). Finally, a relevant discussion is conducted on the possible occurrence of a thermodynamic inconsistency that is related to the stability of the high-density phase over hadronic matter at large densities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_15056 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Speed of sound bounds and first-order phase transitions in compact stars Laskos-Patkos, P. Lalazissis, G. A. Wang, Sibo Meng, Jie Ring, Peter Moustakidis, Ch. C. High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology Nuclear Theory In the present study, we employ three distinct, physically motivated speed of sound bounds to construct hybrid models, where the high-density phase is described by the maximally stiff equation of state. In particular, we consider the bounds related to special relativity, relativistic kinetic theory and conformality. The low-density hadronic phase is described by a state-of-the-art microscopic relativistic Brueckner-Hartree-Fock theory. This work aims to access the effect of the different speed of sound constraints on the relevant parameter space of the key parameters of first-order phase transitions by utilizing recent astronomical data. This involves a systematic analysis that also includes two distinct schemes for the construction of hybrid models (abrupt and smooth). Finally, a relevant discussion is conducted on the possible occurrence of a thermodynamic inconsistency that is related to the stability of the high-density phase over hadronic matter at large densities. |
| title | Speed of sound bounds and first-order phase transitions in compact stars |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology Nuclear Theory |
| url | https://arxiv.org/abs/2408.15056 |