  Using a new kind of 5D Ricci-flat canonical metric, we obtain by a static
foliation an effective 4D Schwarzschild-de Sitter hypersurface. We examine some
particular initial conditions which could be responsible for the inflationary
expansion of the early universe, which could be driven by the explosion of a
White Hole (WH). The zeroth order spectrum outside the WH describes quantum
fluctuations, which for a scale invariant power spectrum, can be expressed in
terms of the cosmological constant, or the square mass of the WH.
