Troubles with Global Monopoles in Quantum Gravity
  A theory with a global $O(3)$ symmetry broken at a scale $\eta$ admits
topological configurations: global monopoles realized by Goldstone fields
winding around the core of false vacuum. One may expect them to behave as
heavy, big composite objects, difficult to make and therefore mostly harmless.
However, after gravity is turned on, as long as Equivalence Principle holds,
one finds that global monopoles have a negative mass, $M \sim -
\eta/\sqrt{\lambda}$, where $\lambda$ is the field theory coupling. This could
catalyze an instability in the space of a global monopole, by the production of
additional global monopole-antimonopole pairs along with normal particles,
leading to energy production {\it ab nihilo}, if the pair energy is dominated
by their negative rest masses. In a theory with unbroken local Poincar\'e
symmetry, this could lead to a divergent `decay rate' of the global monopole
configurations.
