A general method for the calculation of the entanglement entropy in the presence of a magnetic field
We present a method to calculate the entanglement entropy in the presence of a magnetic field in the presence of a classical and a quantum field theory. We do so by constructing the dependent transformation for the energy of the light field in the presence of the field and using it to obtain the entanglement entropy. We find that the entanglement entropy has a universal shape for all directions in the space-time. We demonstrate our method for the case of the general relativity.