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4 papers · 2 filters
Quantum Modifications to Gravity Waves in de Sitter Spacetime
Jen-Tsung Hsiang, L. H. Ford, Da-Shin Lee +1
We treat a model in which tensor perturbations of de~Sitter spacetime, represented as a spatially flat model, are modified by the effects of the vacuum fluctuations of a massless c…
Quantum Stress Tensor Fluctuations of a Conformal Field and Inflationary Cosmology
L. H. Ford, S. P. Miao, Kin-Wang Ng +2
We discuss the additional perturbation introduced during inflation by quantum stress tensor fluctuations of a conformally invariant field such as the photon. We consider both a kin…
Geodesics in the static Mallett spacetime
Ken D. Olum
Mallett has exhibited a cylindrically symmetric spacetime containing closed timelike curves produced by a light beam circulating around a line singularity. I analyze the static ver…
Spacetime Averaged Null Energy Condition
Douglas Urban, Ken D. Olum
The averaged null energy condition has known violations for quantum fields in curved space, even if one considers only achronal geodesics. Many such examples involve rapid variatio…