Funnel's Fluctuations in Dyonic Case: Intersecting D1-D3 Branes
  The fluctuations of funnel solutions of intersecting D1 and D3 branes are quite explicitly discussed by treating different modes and different directions of the fluctuation at the presence of world volume electric field. The boundary conditions are found to be Neumann boundary conditions. 
Jamila Douari and Arafa H Aly