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6 papers · 2 filters
Gravity, Gauges and Clocks
Pierre Teyssandier, Robin W Tucker
We discuss the definitions of standard clocks in theories of gravitation. These definitions are motivated by the invariance of actions under different gauge symmetries. We contrast…
Black Holes with Weyl Charge and Non-Riemannian Waves
Robin W Tucker, Charles Wang
A simple modification to Einstein's theory of gravity in terms of a non-Riemannian connection is examined. A new tensor-variational approach yields field equations that possess a c…
Quantization of the Reduced Phase Space of Two-Dimensional Dilaton Gravity
W. M. Seiler, R. W. Tucker
We study some two-dimensional dilaton gravity models using the formal theory of partial differential equations. This allows us to prove that the reduced phase space is two-dimensio…
Topology Change and the Propagation of Massless Fields
Jonathan Gratus, Robin W Tucker
We analyse the massless wave equation on a class of two dimensional manifolds consisting of an arbitrary number of topological cylinders connected to one or more topological sphere…
Solutions for Neutral for Axi-Dilaton Gravity in 4-Dimensions
T Dereli, M Onder, Robin W Tucker
We examine a 1 parameter class of actions describing the gravitational interaction between a pair of scalar fields and Einsteinian gravitation. When the parameter is positive the t…
An Einstein-Hilbert Action for Axi-Dilaton Gravity in 4-Dimensions
T Dereli, Robin W Tucker
We examine the axi-dilatonic sector of low energy string theory and demonstrate how the gravitational interactions involving the axion and dilaton fields may be derived from a geom…