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Topological Conformal Gravity in Four Dimensions
Malcolm J. Perry, Edward Teo
In this paper, we present a new formulation of topological conformal gravity in four dimensions. Such a theory was first considered by Witten as a possible gravitational counterpar…
BRS and Anti-BRS Symmetry in Topological Yang--Mills Theory
Malcolm J. Perry, Edward Teo
We incorporate both BRS symmetry and anti-BRS symmetry into the quantisation of topological Yang--Mills theory. This refines previous treatments which consider only the BRS symmetr…
The Loss of Unitarity in the Vicinity of a Time Machine
Dalia S. Goldwirth, Malcolm J. Perry, Tsvi Piran
We construct the propagator of a non-relativistic non-interacting particle in a flat spacetime in which two regions have been identified. This corresponds to the simplest "time mac…
The Physics of 2-d Stringy Spacetimes
Gary W. Gibbons, Malcolm J. Perry
We examine the two-dimensional spacetimes that emerge from string theory. We find all the solutions with no tachyons, and show that the only non-trivial solution is the black hole…