Massive hybrid stars with a first-order phase transition

A. Li, W. Zuo, and G. X. Peng
Phys. Rev. C 91, 035803 – Published 18 March 2015

Abstract

We develop our previous study of the transition to deconfined quark phase in neutron stars, including the interaction in the quark equation of state to the leading order in the perturbative expansion within the confinement density-dependent mass model. Using the Gibbs conditions the hadron-quark mixed phase is constructed matching the latter with the hadron equation of state derived from the microscopic Brueckner-Hartree-Fock approximation. The influence of quark interaction parameters on threshold properties and phase diagram of dense neutron star matter are discussed in detail. We find that the leading-order quark interaction expands the density range of the mixed phase, pushing forward the disappearance of the hadron phase. Moreover, since the equation of state could turn out to be stiffer, a high-mass hybrid star is possible with mixed-phase core with typical parameter sets.

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  • Received 9 December 2014
  • Revised 23 February 2015

DOI:https://doi.org/10.1103/PhysRevC.91.035803

©2015 American Physical Society

Authors & Affiliations

A. Li1,2,*, W. Zuo2,3, and G. X. Peng4,5

  • 1Department of Astronomy and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen, Fujian 361005, China
  • 2State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 3Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 4School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
  • 5Theoretical Physics Center for Science Facilities, Institute of High Energy Physics, Beijing 100049, China

  • *liang@xmu.edu.cn

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Vol. 91, Iss. 3 — March 2015

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