1 Department of Physics, Technical University of Denmark2 Biophysics and Fluids, Department of Physics, Technical University of Denmark3 C.V. Raman College of Engineering4 University of Coimbra5 University of Coimbra
We investigate the occurrence of a ferromagnetic phase transition in high density hadronic matter (e.g., in the interior of a neutron star). This could be induced by a four-fermion interaction analogous to the one which is responsible for chiral symmetry breaking in the Nambu-Jona-Lasinio model, to which it is related through a Fierz transformation. Flavor SU(2) and flavor SU(3) quark matter are considered. A second-order phase transition is predicted at densities about 5 times the normal nuclear matter density. It is also found that in flavor SU(3) quark matter, a first-order transition from the so-called 2 flavor super-conducting phase to the ferromagnetic phase arises. The color-flavor-locked phase may be completely hidden by the FP.
International Journal of Modern Physics E, 2013, Vol 22, Issue 4