  The conservation law for the angular momentum in curved spacetime requires
that the antisymmetric part of the affine connection (the torsion tensor) is a
variable in the principle of least action. The coupling between spin and
torsion generates gravitational repulsion in fermionic matter at extremely high
densities and avoids the formation of singularities in black holes. We show
that every black hole in the presence of torsion forms a nonsingular, closed,
nearly flat, homogeneous, and isotropic universe on the other side of its event
horizon. Quantum particle production in such a universe can generate a period
of exponential expansion which creates an enormous amount of matter in that
universe. Accordingly, our Universe may have originated from the interior of a
black hole existing in another universe.
