The Hubble parameters in the D-brane models
  We consider the DBI action for the D-branes with the dynamic embeddings in the background produced by p-branes. For the D-brane with the special topology we obtain two Hublle parameters on this brane. The condition for the equality of these parameters is analyzed. In the special case a mass and a charge of the background p-branes are derived from this condition. 
Pawel Gusin