Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1993-05-07
Phys.Lett. B307 (1993) 362-366
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
8 pages, IMAFF-RC-01-93#
Scientific paper
10.1016/0370-2693(93)90233-8
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.
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