Magnetized strange quark matter and magnetized strange quark stars
R. Gonz\ ' { a} lez Felipe, A. P\ ' { e} rez Mart\'{\i}nez, H. P\ ' { e} rez Rojas, and M. Orsaria

Strange quark matter could be found in the core of neutron stars or forming strange quark stars. As is well known, these astrophysical objects are endowed with strong magnetic fields which affect the microscopic properties of matter and modify the macroscopic properties of the system. In this paper we study the role of a strong magnetic field in the thermodynamical properties of a magnetized degenerate strange quark gas, taking into account $\beta$-equilibrium and charge neutrality. Quarks and electrons interact with the magnetic field via their electric charges and anomalous magnetic moments. In contrast to the magnetic field value of $10^{19}\,$G, obtained when anomalous magnetic moments are not taken into account, we find the upper bound $B \lesssim 8.6 \times 10^{17}\,$G, for the stability of the system. A phase transition could be hidden for fields greater than this value.

© 2008 The American Physical Society.