Influence of the crust on the neutron star macrophysical quantities and universal relations

Understand

Measurements of neutron-star macrophysical properties thanks to multimessenger observations offer the possibility to constrain the properties of nuclear matter.

• Indeed cold and dense matter as found inside neutron stars, in particular in their core, is not accessible to terrestrial laboratories.We investigate the consequences of using equations of state that employ models for the core and the crust that are not calculated consistently on the neutron-star macrophysical properties, on some of the so-called universal relations and on the constraints obtained from gravitational-wave observations.
• We use various treatments found in the literature to connect together nonconsistent core and crust equations of state.
• We then compute the mass, the radius, the tidal deformability, and the moment of inertia for each model.