MagStarMatter: Exploring matter under extreme conditions: neutron stars in the multi-messenger era

Magnetars are a class of neutron stars that have very strong magnetic fields, of the order of 10^{15} G at the surface, and a slow rotation period, of the order of 1-12s. In this project, unified equations of state for non-magnetised and magnetised nuclear and stellar matter, which are the essential ingredient to build the stars mass-radius relation, will be constructed, consistent with recent theoretical, experimental and observational developments, and which may advance our current understanding of compact astrophysical objects and dense nuclear matter equation of state. Such equations of state can then be used in core-collapse supernovae and binary neutron star mergers simulations. Special attention will be given to the non-homogeneous equation of state at sub-saturation densities. Light nuclear clusters measured in heavy-ion collisions, under similar thermodynamic conditions, will allow the construction of a calibrated equation of state. Recently, the importance of including in-medium effects in the analysis of HIC data was demonstrated, and a new EoS with light clusters for stellar and nuclear matter was built. Some of the presently available most popular equations of state for supernova simulations only consider alpha clusters, and equations of state based on a statistical model do not consider adequately in-medium modifications of nuclear clusters at finite temperature. A calibrated sub-saturation equation of state where light clusters and pasta phases are included will therefore be calculated. The role of the symmetry energy will be taken into consideration. The unified equation of state for neutron stars and core-collapse supernovae will be next constructed, and made publicly available.

Status: Running

Starting date: 2023-02-01

End date: 2024-07-31

Financing: 49099.94€ Euros

Financing entity: FCT

Project ID: 2022.06460.PTDC

Person*month: 0

Group person*month: 0