Magnetic moments of octet baryons at finite density and temperature

Abstract

We investigate the change of magnetic moments of octet baryons in nuclear matter at a finite density and temperature. Quark-meson coupling (QMC) models are employed in describing the properties of octet baryons and their interactions. Magnetic moments of octet baryons are found to increase non-negligibly as density and temperature increase, and we find that the temperature dependence can be strongly correlated with the quark-hadron phase transition. The model dependence is also examined by comparing the results from the QMC model to those from the modified QMC (MQMC) model where the bag constant is assumed to depend on density. Both models predict sizable dependence on density and temperature, but the MQMC model shows a more drastic change of magnetic moments. Feasible changes of the nucleon mass by strong magnetic fields are also reported for the given models.