FRW cosmological model inside an isolated Schwarzschild black hole
  Using the canonical quantum theory of spherically symmetric pure gravitational systems, we present a direct correspondence between the Friedmann-Robertson-Walker (FRW) cosmological model in the interior of a Schwarzschild black hole and the nth energy eigenstate of a linear harmonic oscillator. Such type of universe has a quantized mass of the order of the Planck mass and harmonic oscillator wave functions 
C. Ortiz, J.J. Rosales, J. Socorro and V. I. Tkach