content_image/326804.jpg content_image/326808.jpg content_image/326809.jpg
<img src='content_image/326804.jpg'>

be reliably approximated by the Born-Infeld action [322, 325] for the massless modes of the string theory. For Type IIB the boson part of the action on the D brane worldvolume reads: 

<img src='content_image/326808.jpg'>

<img src='content_image/326809.jpg'>

where the θ i are the angular coordinates of the 5-sphere. The r and θ i are then six scalar fields that are functions of the brane coordinates. Notice that 

