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6 papers · 2 filters
Stress Tensor Correlators in the Schwinger-Keldysh Formalism
L. H. Ford, R. P. Woodard
We express stress tensor correlators using the Schwinger-Keldysh formalism. The absence of off-diagonal counterterms in this formalism ensures that the +- and -+ correlators are fr…
Can a circulating light beam produce a time machine?
Ken D. Olum, Allen Everett
In a recent paper, Mallett found a solution of the Einstein equations in which closed timelike curves (CTC's) are present in the empty space outside an infinitely long cylinder of…
Time travel paradoxes, path integrals, and the many worlds interpretation of quantum mechanics
Allen Everett
We consider two approaches to evading paradoxes in quantum mechanics with closed timelike curves (CTCs). In a model similar to Politzer's, assuming pure states and using path integ…
Energy Flux Correlations and Moving Mirrors
L. H. Ford, Thomas A. Roman
We study the quantum stress tensor correlation function for a massless scalar field in a flat two-dimensional spacetime containing a moving mirror. We construct the correlation fun…
Energy conditions outside a dielectric ball
Noah Graham, Ken D. Olum, Delia Schwartz-Perlov
We show analytically that the vacuum electromagnetic stress-energy tensor outside a ball with constant dielectric constant and permeability always obeys the weak, null, dominant, a…
Effects of Quantum Stress Tensor Fluctuations with Compact Extra Dimensions
J. Borgman, L. H. Ford
The effects of compact extra dimensions upon quantum stress tensor fluctuations are discussed. It is argued that as the compactification volume decrease, these fluctuations increas…