We discuss the problem of a degenerate vierbein in the framework of gauge theories of gravitation. We show that a region of space-time with vanishing vierbein but smooth principal connection can be, in principle, detected by scattering experiments. Here

Abstract
Evans developed a classical unified field theory of gravitation and electromagnetism on the background of a spacetime obeying a Riemann-Cartan geometry. This geometry can be characterized by… Expand

We review Event Enhanced Quantum Theory (EEQT). In Sect. 1 we address the question ‘Is quantum theory the last word’. In particular we respond to some of the challenging statements of H. P. Stapp. We… Expand

We review Event Enhanced Quantum Theory (EEQT). In Section 1 we address the question ”Is Quantum Theory the Last Word”. In particular we respond to some of challenging staments of H.P. Stapp. We also… Expand

The teleparallelism theory of gravity is presented as a constrained Poincare gauge theory. Arguments are given in favor of a two-parameter family of field Lagrangians quadratic in torsion. The… Expand

The structure of boundaries between degenerate and non-degenerate solutions of Ashtekar's canonical reformulation of Einstein's equations is studied. Several examples are given of such `phase… Expand

On pure gauge theories, talk at the Conf. on Gauge Theories and Spinor Structures

On pure gauge theories, talk at the Conf. on Gauge Theories and Spinor Structures

1982

Phys

Phys

1982

Phys. Lett

Phys. Lett

1978

Lett

Math. Phys., 5

1981

Commun

Math. Phys., 80 (1981) 381-402; L F Abbott and S. Deser, Nucl. Phys. B l95 (1982) 76-96; A. Lapedes and E. Mottola, Phys. Lett. 110 B (1982) 114-116; T. Parker and C. H. Taubes, Commun. Math. Phys., 84