Speaker
Description
Strong magnetic fields and exotic phases of dense matter are expected to play a fundamental role in determining the internal composition and global properties of compact stars. Among the possible constituents of matter at supranuclear densities, Bose-Einstein condensates (BECs) of bosonic particles provide an attractive scenario for describing the interiors of neutron stars and other compact objects. In this contribution, we investigate the microscopic thermodynamics of a relativistic gas of charged scalar bosons immersed in a uniform magnetic field, including both statistical and vacuum contributions over a wide range of field strengths. By separating the lowest Landau level from the excited states, we analyze the influence of the magnetic field on Bose Einstein condensation, specific heat, magnetization, and the resulting anisotropic equation of state. We show that magnetic confinement leads to a diffuse condensation process without a well-defined critical temperature and produces characteristic signatures in the specific heat associated with dimensional reduction. The competition between statistical and vacuum contributions also gives rise to a transition from diamagnetic to vacuum-driven paramagnetic behavior at high magnetic fields, while antiparticles significantly modify the thermodynamic response. These results provide a consistent microscopic equation of state for magnetized charged bosonic matter and constitute the basis for modeling compact stars containing charged Bose-Einstein condensates, such as pion-condensed phases, under the extreme magnetic fields characteristic of magnetars. The implications of these findings for the structure and observable properties of magnetized BEC stars will also be discussed.