Dense stellar matter with trapped neutrinos under strong magnetic fields

Aziz Rabhi (1, 2) , Constança Providência (1)

1 Department of Physics [Coimbra]
2 FST - Faculté des Sciences Mathématiques, Physiques et Naturelles de Tunis

We investigate the effects of strong magnetic fields on the equation of state of dense stellar neutrino-free and neutrino-trapped matter. Relativistic nuclear models both with constant couplings (NLW) and with density dependent parameters (DDRH) and including hyperons are considered. It is shown that at low densities neutrinos are suppressed in the presence of the magnetic field. The magnetic field reduces the strangeness fraction of neutrino-free matter and increases the strangeness fraction of neutrino-trapped matter. We have studied some properties of stars with trapped neutrinos and strong magnetic fields. A density dependent magnetic field with the magnitude 10 15 G at the surface was considered. The magnetic field reduces the strangeness content of the star, and, as a consequence, the possibility of formation of a black-hole after the outflow of neutrinos, since it is the appearance of exotic matter in neutrino free matter that may induce a black-hole formation, if the EOS becomes too soft.

Mots clés: 26.60.+c; 12.39.Ba; 21.65.+f; 97.60.Jd

Aziz Rabhi, Constança Providência. Dense stellar matter with trapped neutrinos under strong magnetic fields. Journal of Physics G: Nuclear and Particle Physics, 2010, 37 (7), pp.75102. ⟨10.1088/0954-3899/37/7/075102⟩. ⟨hal-00600818⟩