Finite-size effects at the hadron-quark transition and heavy hybrid stars

Nobutoshi Yasutake, Rafał Łastowiecki, Sanjin Benić, David Blaschke, Toshiki Maruyama, and Toshitaka Tatsumi
Phys. Rev. C 89, 065803 – Published 17 June 2014

Abstract

We study the role of finite-size effects at the hadron-quark phase transition in a new hybrid equation of state constructed from an ab initio Brückner-Hartree-Fock equation of state with the realistic Bonn-B potential for the hadronic phase and a covariant nonlocal Nambu–Jona-Lasinio model for the quark phase. We construct static hybrid star sequences and find that our model can support stable hybrid stars with an onset of quark matter below 2M and a maximum mass above 2.17M in agreement with recent observations. If the finite-size effects are taken into account the core is composed of pure quark matter. Provided that the quark vector channel interaction is small, and the finite size effects are taken into account, quark matter appears at densities 2–3 times the nuclear saturation density. In that case the proton fraction in the hadronic phase remains below the value required by the onset of the direct URCA process, so that the early onset of quark matter shall affect on the rapid cooling of the star.

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  • Received 6 April 2014

DOI:https://doi.org/10.1103/PhysRevC.89.065803

©2014 American Physical Society

Authors & Affiliations

Nobutoshi Yasutake1,*, Rafał Łastowiecki2,†, Sanjin Benić3,‡, David Blaschke2,4,§, Toshiki Maruyama5,∥, and Toshitaka Tatsumi6,¶

  • 1Department of Physics, Chiba Institute of Technology, 2-1-1 Shibazono, Narashino, Chiba 275-0023, Japan
  • 2Institute for Theoretical Physics, University of Wrocław, Max Born pl. 9, 50-204 Wrocław, Poland
  • 3Physics Department, Faculty of Science, University of Zagreb, Zagreb 10000, Croatia
  • 4Bogoliubov Laboratory for Theoretical Physics, JINR Dubna, 141980 Dubna, Russia
  • 5Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 6Department of Physics, Kyoto University, Kyoto 606-8502, Japan

  • *nobutoshi.yasutake@it-chiba.ac.jp
  • lastowiecki@ift.uni.wroc.pl
  • sanjinb@phy.hr
  • §blaschke@ift.uni.wroc.pl
  • maruyama.toshiki@jaea.go.jp
  • tatsumi@ruby.scphys.kyoto-u.ac.jp

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Issue

Vol. 89, Iss. 6 — June 2014

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