Magnetic Brane of Cubic Quasi-Topological Gravity in the Presence of   Maxwell and Born-Infeld Electromagnetic Field
  The main purpose of the present paper is analyzing magnetic brane solutions of cubic quasi-topological gravity in the presence of a linear electromagnetic Maxwell field and a nonlinear electromagnetic Born-Infeld field. We show that the mentioned magnetic solutions have no curvature singularity and also no horizons, but we observe that there is a conic geometry with a related deficit angle. We obtain the metric function and deficit angle and consider their behavior. We show that the attributes of our solution are dependent on cubic quasi-topological coefficient and the Gauss-Bonnet parameter. 
M. Ghanaatian, A. Bazrafshan, S. Taghipoor and R. Tawoosi
hep-th