R-charged adS bubble

We construct R-charged adS bubbles in D=5, N=8 supergravity. These bubbles are characterized by four parameters. The asymptotic boundary of these solutions are de Sitter times a circle. By comparing boundary energies, we study the possibility of a transition from certain class of black holes to these bubbles below a critical radius of the boundary circle. We argue that this may occur when four parameters of the bubble satisfy a constraint among themselves.