Thermal twin stars within a hybrid equation of state based on a nonlocal chiral quark model compatible with modern astrophysical observations
| Autor: | Carlomagno, J. P., Contrera, G. A., Grunfeld, A. G., Blaschke, D. |
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| Rok vydání: | 2023 |
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| Zdroj: | Phys. Rev. D 109, 043050 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.109.043050 |
| Popis: | We investigate the extension to finite temperatures and neutrino chemical potentials of a recently developed nonlocal chiral quark model approach to the equation of state of neutron star matter. We consider two light quark flavors and current-current interactions in the scalar-pseudoscalar, vector, and diquark pairing channels, where the nonlocality of the currents is taken into account by a Gaussian form factor that depends on the spatial components of the 4-momentum. Within this framework, we analyze order parameters, critical temperatures, phase diagrams, equations of state, and mass-radius relations for different temperatures and neutrino chemical potentials. For parameters of the model that are constrained by recent multi-messenger observations of neutron stars, we find that the mass-radius diagram for isothermal hybrid star sequences exhibits the thermal twin phenomenon for temperatures above 30 MeV. Comment: 15 pages, 14 figures. Version accepted for publication in Physical Review D |
| Databáze: | arXiv |
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