Mixed phase effects on high-mass twin stars

作者：Alvarez Castillo D E^*; Blaschke D

来源：Physics of Particles and Nuclei, 2015, 46(5): 846-848.

DOI：10.1134/S1063779615050032

Recently it has been found that a certain class of hybrid star equations of state with a large latent heat (strong first order phase transition obtained by a Maxwell construction) between stiff hadronic and stiff quark matter phases allows for the appearance of a third family of compact stars (including "twins") at high mass of similar to 2 M (aS (TM)) We investigate how robust this high-mass twin phenomenon is against a smoothing of the transition which would occur, e.g., due to pasta structures in the mixed phase. To this end we propose a simple construction of a pasta-like equation of state with a parameter that quantifies the degree of smoothing of the transition and could eventually be related to the surface tension of the pasta structures. It is interesting to note that the range of energy densities for the transition as well as the pressure at the onset of the transition of this class of hybrid star matter at zero temperature corresponds well to values of the same quantities found in finite

• 出版日期2015-9