Fábio Köpp, Jorge Ernesto Horvath, Dimiter Hadjimichef, César A. Zen Vasconcellos
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Quark/Hybrid Stars Within Perturbative QCD in View of the GW170817 Event
In this study, we examine the implications of perturbative Quantum Chromodynamics (pQCD) extrapolated from higher energies down to the neutron star range, as applied to hybrid stars. In describing the hybrid star, we represent the quark phase by pQCD, and the hadronic phase using the APR4 equation of state (EoS). The phase transition itself is modeled using the Maxwell construction. We hypothesize as a consequence of our work that the central compact object XMMU J173203.3, could be a quark star described by the pQCD EoS. Analysis of the mass-radius diagrams and the dimensionless tidal deformability are performed. The results obtained for the latter in the case of hybrid star models are consistent with observations from the GW170817 event; however, they do not meet the constraint.
期刊介绍：
Astronomische Nachrichten, founded in 1821 by H. C. Schumacher, is the oldest astronomical journal worldwide still being published. Famous astronomical discoveries and important papers on astronomy and astrophysics published in more than 300 volumes of the journal give an outstanding representation of the progress of astronomical research over the last 180 years. Today, Astronomical Notes/ Astronomische Nachrichten publishes articles in the field of observational and theoretical astrophysics and related topics in solar-system and solar physics. Additional, papers on astronomical instrumentation ground-based and space-based as well as papers about numerical astrophysical techniques and supercomputer modelling are covered. Papers can be completed by short video sequences in the electronic version. Astronomical Notes/ Astronomische Nachrichten also publishes special issues of meeting proceedings.
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