Light, Links and Causal Sets
arXiv:0910.0673 · doi:10.1088/1742-6596/174/1/012018
Abstract
After sketching a context in which to seek observable signals of spatio-temporal discreteness, I briefly review the status of the causal set program for quantum gravity, concluding with a simple model for the field produced by a moving charge in a background causal set.
plainTeX, 18 pages, no figures. Most current version is available at http://www.physics.syr.edu/~sorkin/some.papers/ (or wherever my home-page may be)