Causality for first-order phase transition and its implication to neutron stars
| Autor: | Saha, Asim kumar, Mallick, Ritam |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Causality is an important factor determining the maximum mass of a neutron star. Previous works studies causality for smooth equation of state. The density at the core of neutron stars can be few times nuclear saturation density, where the occurrence of first-order phase transition has not been ruled out. The causality condition for first-order phase transition is characteristically different from the causality condition of smooth equation of state which can be evident in the mass-radius expression. In this letter we examine the causality condition for first-order phase transition and its observational significance in the mass-radius sequence. We find that equation of state having first-order phase transition, the causality line deviates considerably from the that of smooth equation of state. Depending on the strength of the discontinuity and the onset density of phase transition there is a narrow band in the mass-radius plot which is available only to the stars having smooth equation of state. This can have significant consequence in the sense that if some pulsars are to lie in this band one can rule out equation of state having first-order phase transition occurring at that particular onset density. Comment: 7 pages, 9 figures |
| Databáze: | arXiv |
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