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Two-solar-mass hybrid stars: a two model description with the Nambu-Jona-Lasinio quark model
Authors: Renan Câmara Pereira; Pedro Costa; Constança Providência
Ref.: Phys. Rev. D 94, 094001-16 (2016)
Abstract: Hybrid stars with a quark phase described by the NambuJona-Lasinio model are studied. The hadron-quark model used to determine the stellar matter equation of state favors the appearance of quark matter: the coincidence of th deconfinement and chiral transitions and a low vacuum constituent quark mass. These two properties are essential to build equations of state that predict pure quark matter in the center oef neutron stars. The effect of vector-isoscalar and vector-isovector terms is discussed, and it is shown that the vector-isoscalar terms are necessary to describe 2M⊙ hybrid stars, and the vector-isovector terms result in larger quark cores and a smaller deconfinement density.
