where B α α β β = ∂ ∂ α α u β β − − ∂ ∂ β β u α α , while K is a dimensionless parameter. k and K are respectively called the scalar and vector coupling constants of the theory. The consistency between the Gravitoelectromagnetism of the TeVeS theory and that predicted and measured by the Gravity Probe B leads to K = k 2 π π , and requiring consistency between the near horizon geometry of a black hole in TeVeS and that of the Einstein theory, as observed by the Event Horizon Telescope leads to K = − − 30 + 72 π π k . So the coupling constants read: