The Quantum Sphaleron
arXiv:gr-qc/9305006 · doi:10.1016/0370-2693(93)90233-8
Abstract
A gravitational instanton is found that can tunnel into a new more stable vacuum phase where diffeomorphism invariance is broken and pitchfork bifurcations develop. This tunnelling process involves a double sphaleron-like transition which is associated with an extra level of quantization which is above that is contained in quantum field theory.
arXiv comment8 pages, IMAFF-RC-01-93#