Würzburg 2018 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 8: Poster session (permanent)

GR 8.4: Poster

Wednesday, March 21, 2018, 18:00–19:30, Phys-SR-SE2

Scalarization of neutron stars with realistic equations of state — •Zahra Altaha Motahar, Jose Luis Blazquez-Salcedo, Burkhard Kleihaus, and Jutta Kunz — Oldenburg University

Neutron stars are one of the most mysterious but interesting objects in the universe. Due to their compactness and high ensity, we can take them as an ideal laboratory to test alternative theories of gravity. In addition, studying neutron stars can improve our limited knowledge of properties and the physics of nuclear matter in such a high density inside these compact objects.

We demonstrate the effect of scalarization on static and slowly rotating neutron stars implementing various realistic Equations Of State (EOSs). Beside polytropic EOS and some EOSs considering pure nuclear matter, and pure quark matter, particularly we include several EOSs describing nuclear matter with hyperons and hybrid matter for the first time in this context.

We investigate the onset of scalarization, for these different EOSs presenting a universal relation for the critical coupling parameter versus the compactness. We then recognize that the most significant universal (independent of the EOS) feature of the onset and the magnitude of the scalarization, is the correlation with the value of the the gravitational potential at the center of the star. We also analyze the moment-of-inertia--compactness relations and confirm universality for the nuclear matter, hyperon and hybrid equations of state.