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Acoustic propagation in fluids: an unexpected example of Lorentzian geometry
Matt Visser
It is a deceptively simple question to ask how acoustic disturbances propagate in a non--homogeneous flowing fluid. If the fluid is barotropic and inviscid, and the flow is irrotat…
van Vleck determinants: traversable wormhole spacetimes
Matt Visser
Calculating the van Vleck determinant in traversable wormhole spacetimes is an important ingredient in understanding the physical basis behind Hawking's chronology protection conje…
Hawking's chronology protection conjecture: singularity structure of the quantum stress--energy tensor
Matt Visser
The recent renaissance of wormhole physics has led to a very disturbing observation: If traversable wormholes exist then it appears to be rather easy to to transform such wormholes…
Dirty black holes: Entropy versus area
Matt Visser
Considerable interest has recently been expressed in the entropy versus area relationship for ``dirty'' black holes --- black holes in interaction with various classical matter fie…