Regular Article – Theoretical Physics (CE siehe acceptance letter / OriginalPaper)
The possibility of twin star solutions in a model based on lattice QCD thermodynamics
School of Physics and Astronomy, Monash University Clayton, Clayton, Australia
2 Institut für Theoretische Physik, Goethe Universität, Frankfurt am Main, Germany
3 Frankfurt Institute for Advanced Studies, Giersch Science Center, Frankfurt am Main, Germany
4 GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
Accepted: 19 December 2020
Published online: 18 January 2021
The properties of compact stars and in particular the existence of twin star solutions are investigated within an effective model that is constrained by lattice QCD thermodynamics. The model is modified at large baryon densities to incorporate a large variety of scenarios of first order phase transitions to a phase of deconfined quarks. This is achieved by matching two different variants of the bag model equation of state, in order to estimate the role of the Bag model parameters on the appearance of a second family of neutron stars. The produced sequences of neutron stars are compared with modern constrains on stellar masses, radii, and tidal deformability from astrophysical observations and gravitational wave analyses. It is found that those scenarios in our analysis, in which a third family of stars appeared due to the deconfinement transition, are disfavored from astrophysical constraints.
© The Author(s) 2021
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