Radical New Theory: "Our Universe may be the interior of a black
hole existing in another universe” (Today's Most Popular) “Our
own Universe may be the interior of a black hole existing in
another universe.” In a remarkable paper about the nature of
space and the origin of time, Nikodem Poplawski, a physicist at
Indiana University, suggests that a small change to the theory
of gravity implies that our universe inherited its arrow of time
from the black hole in which it was born. Poplawski says that
the idea that black holes are the cosmic mothers of new
universes is a natural consequence of a simple new assumption
about the nature of spacetime. Poplawski points out that the
standard derivation of general relativity takes no account of
the intrinsic momentum of spin half particles. However there is
another version of the theory, called the Einstein-Cartan-
Kibble-Sciama theory of gravity, which does. This theory
predicts that particles with half integer spin should interact,
generating a tiny repulsive force ca