Structure of neutrino-dominated accretion disks with magnetic fields

The neutrino-dominated disk is regarded as a plausible model for the central engine of Gamma-Ray Bursts.By taking into account magnetic fields and detailed microphysics,we calculate the structure of neutrino-dominated disks in the frame of the well-known Paczyński-Witta potential.The results show that the temperature of the disk is lower than that without magnetic fields,whereas the density is nearly the same as that without magnetic fields.There also exists a significant difference in the electron degeneracy between the above two cases.In addition,we present the variation of the electron fraction with the radius.