Finite energy Dirac-Born-Infeld monopoles and string junctions - art. no. 045004

It is shown that the world volume field theory of a single D3-brane in a su pergravity D3-brane background admits finite energy, and non-singular, Abel ian monopoles and dyons preserving 1/2 or 1/4 of the N=4 supersymmetry and saturating a Bogomol' nyi-type bound. The 1/4 supersymmetric solitons provi de a world volume realization of string-junction dyons. We also discuss the dual M-theory realization of the 1/2 supersymmetric dyons as finite tensio n self-dual strings on the M5-brane, and of the 1/4 supersymmetric dyons as their intersections. [S0556-2821(99)04116-8].