Gravitational Analogues of Non-Linear BornElectrodynamics
Physics Review D
Gravitational analogues of the nonlinear electrodynamics of Born and of Born and Infeld are introduced and applied to the black hole problem. This work is mainly devoted to the 2-dimensional case in which the relevant Lagrangians are nonpolynomial in the scalar curvature.
Feigenbaum, J., P.G.O. Freund, and M. Pigli, (1998), “Gravitational Analogues of Non-Linear Born Electrodynamics,” Physical Review D 57: 4738.