The Paradox of Virtual Dipoles in the Einstein Action
arXiv:hep-th/0005038 · doi:10.1103/PhysRevD.62.087502
Abstract
The functional integral of pure Einstein 4D quantum gravity admits abnormally large and long-lasting "dipolar fluctuations", generated by virtual sources with the property Int d^4x Sqrt{g(x)} Tr T(x) = 0. These fluctuations would exist also at macroscopic scales, with paradoxical consequences. We set out their general features and give numerical estimates of possible suppression processes.
LaTeX, 5 pages; reference added