The universe as a closed anisotropic universe born in a black hole
  We consider a universe formed in a black hole in the Einstein--Cartan theory
of gravity. The interior of a Schwarzschild black hole can be represented by
the Kantowski--Sachs metric that describes a closed anisotropic universe. We
use this metric to derive the field equations with a relativistic spin fluid as
a source. We show that torsion may prevent a singularity and replace it with a
nonsingular bounce if particle production dominates over shear. Particle
production after the last bounce can generate a finite period of inflation,
during which the universe expands and isotropizes to the currently observed
state. Our universe might have therefore originated from a black hole.
