Aug 2 – 6, 2021
Europe/Brussels timezone

Special point and onset of deconfinement in the M-R diagram of neutron stars.

Aug 5, 2021, 10:30 AM


Parallel contribution F: Nuclear and Astroparticle Physics Parallels Track F


Mateusz Cierniak (University of Wrocław)


I present the results of a systematic investigation of the possible locations for the neutron star special point (SP), a unique feature of hybrid neutron stars in the mass-radius. The study is performed within the two-phase approach where the high-density (quark matter) phase is described by the constant-sound-speed (CSS) equation of state (EoS) and the nuclear matter phase around saturation density is varied from very soft (APR) to stiff (DD2 with excluded nucleon volume). In this study we demonstrate the invariance of the SP to the details of the onset of deconfinement (be it a 1st order phase transition or crossover interpolation construction). The utility of this unique feature of hybrid stars is explored by means of a derived relation between the SP mass and the maximum mass of non-rotating neutron stars, as well as possible implications in the context of GW170817 and the novel NICER measurement of PSR J0740+6620.

Primary author

Mateusz Cierniak (University of Wrocław)


Prof. David Blaschke (University of Wroclaw)

Presentation materials