CAOSP abstracts, Volume: 46, No.: 2, year: 2016

Abstract: A toy model for the state transitions of X-ray binaries (XRBs) is proposed by considering the effects of cosmic battery. In our model, we present an explanation for the origin of the magnetic field: some electric currents flowing around a Kerr black hole in the equatorial plane generates the poloidal magnetic field which exists on the black hole and the accretion disk. And the magnetic field is very important for explaining the state transitions. We discuss the different configurations of magnetic field corresponding to different states of the XRBs—GRO J1655-40. It turns out that the Poynting-Robertson cosmic battery could be the key factor for explaining the state transitions of XRBs.