Description: It is suggested that the absence of torsion in conventional gravity could in fact be dynamical. A gravitational Meissner effect might produce instanton-like vortices of nonzero torsion concentrated at four-dimensional points; such torsion vortices would be the gravitational analogs of magnetic flux vortices in a type II superconductor. Ordinary torsion-free spacetime would correspond to the field-free superconducting region of a superconductor; a dense phase of ''torsion foam'' with vanishing metric but well defined affine connection might be the analog of a normal conductor. 14 references.
Date: September 1, 1978
Creator: Hanson, A.J. & Regge, T.
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