  A modification to the time-energy uncertainty relation in quantum gravity has
been interpreted as increasing the duration of fluctuations producing virtual
black holes with masses greater than the Planck mass. I point out that such
virtual black holes have an exponential factor arising from the action such
that their contribution to proton decay is suppressed, rather than enhanced,
relative to Planck-mass black holes.

High Energy Physics - Theory;Astrophysics;General Relativity and Quantum Cosmology;High Energy Physics - Phenomenology