Flag-dipole and flagpole spinors fluid flows in Kerr spacetimes

摘要

Flagpole and flag-dipole spinors are particular classes of spinor fields thathas been recently used in different branches of theoretical physics. In thispaper, we study the possibility and consequences of these spinor fields toinduce an underlying fluid flow structure in the background of Kerr spacetimes.We show that flag-dipole spinor fields are solutions of the equations of motionin this context. To our knowledge, this is the second time that this class ofspinor field appears as a physical solution, the first one occurring as asolution of the Dirac equation in ESK gravities.