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Tolman wormholes violate the strong energy condition
David Hochberg, Carmen Molina-Paris, Matt Visser
For an arbitrary Tolman wormhole, unconstrained by symmetry, we shall define the bounce in terms of a three-dimensional edgeless achronal spacelike hypersurface of minimal volume.…
Minimal conditions for the creation of a Friedman-Robertson-Walker universe from a "bounce"
Carmen Molina-Paris, Matt Visser
We investigate the minimal conditions under which the creation of our universe might arise due to a "bounce" from a previous collapse, rather than an explosion from a big-bang sing…
Superluminal censorship
Matt Visser, Bruce Bassett, Stefano Liberati
We argue that ``effective'' superluminal travel, potentially caused by the tipping over of light cones in Einstein gravity, is always associated with violations of the null energy…
Zeta functions, renormalization group equations, and the effective action
David Hochberg, Carmen Molina-Paris, Juan Perez-Mercader +1
We demonstrate how to extract all the one-loop renormalization group equations for arbitrary quantum field theories from knowledge of an appropriate Seeley--DeWitt coefficient. By…
Renormalization Group Improving the Effective Action
David Hochberg, Carmen Molina-Paris, Juan Perez-Mercader +1
The existence of fluctuations together with interactions leads to scale-dependence in the couplings of quantum field theories for the case of quantum fluctuations, and in the coupl…
Sonoluminescence as a QED vacuum effect: Probing Schwinger's proposal
S. Liberati, F. Belgiorno, Matt Visser +1
Several years ago Schwinger proposed a physical mechanism for sonoluminescence in terms of photon production due to changes in the properties of the quantum-electrodynamic (QED) va…