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6 papers · 2 filters
Vacuum Lightcone Fluctuations in a Dielectric
C. H. G. Bessa, V. A. De Lorenci, L. H. Ford +1
A model for observable effects of electromagnetic vacuum fluctuations is presented. The model involves a probe pulse which traverses a slab of nonlinear optical material with a non…
Stablizing oscillating universes against quantum decay
Audrey T. Mithani, Alexander Vilenkin
We investigate the effect of vacuum corrections, due to the trace anomaly and Casimir effect, on the stability of an oscillating universe with respect to decay by tunneling to the…
Instability of an emergent universe
Audrey T. Mithani, Alexander Vilenkin
Oscillating solutions to the effective equations of Loop Quantum Cosmology have been suggested for the role of an `eternal seed', providing a possible starting point for the emerge…
Past incompleteness of a bouncing multiverse
Alexander Vilenkin, Jun Zhang
According to classical GR, Anti-de Sitter (AdS) bubbles in the multiverse terminate in big crunch singularities. It has been conjectured, however, that the fundamental theory may r…
Flux Compactifications on
Adam R. Brown, Alex Dahlen, Ali Masoumi
We investigate a simple extra-dimensional model and its four-dimensional vacua. This model has a two-form flux and a positive cosmological constant, and the extra dimensions are co…
Schwinger effect in de Sitter space
Markus B. Fröb, Jaume Garriga, Sugumi Kanno +4
We consider Schwinger pair production in 1+1 dimensional de Sitter space, filled with a constant electric field . This can be thought of as a model for describing false vacuum d…