Article
QED trace anomaly, non-local Lagrangians, and quantum Equivalence Principle violations
Journal of High Energy Physics
(2015)
Abstract
We discuss the derivation of the trace anomaly using a non-local effective action at one loop. This
provides a simple and instructive form and emphasizes infrared physics. We then use this example
to explore several of the properties of non-local actions, including displaying the action for the full
non-local energy-momentum tensor. As an application, we show that the long-distance corrections
at one loop lead to quantum violations of some classical consequences of the equivalence principle,
for example producing a frequency dependence of the gravitational bending of light.
Disciplines
Publication Date
2015
DOI
10.1007/JHEP05(2015)118
Citation Information
John Donoghue and Basem K Mahmoud El-Menoufi. "QED trace anomaly, non-local Lagrangians, and quantum Equivalence Principle violations" Journal of High Energy Physics Vol. 1505 Iss. 118 (2015) Available at: http://works.bepress.com/john_donoghue/170/