Figure 1:
Charged particles moving in curved orbits emit photons into tangential cones of emission called synchrotron radiation. A similar effect can occur for orbiting particles in a model where the interactions are much more strongly coupled than in electromagnetism. Such motions can be studied by considering a string (purple) moving in five dimensional anti-de-Sitter (AdS) space—a world governed by Einstein’s equations of general relativity with negative curvature. Such spaces are conjectured to be related to quantum field theories one dimension lower. The diagram shows an endpoint of the string as a point charge constrained to a circular orbit on the boundary (blue plane) of the AdS space. One can map out the energy distribution in the radiation pattern emitted by the point charge in the boundary field theory (the top plane), whose intensity is color coded (red = high intensity, blue = low intensity). Athanasiou et al. [1] find that the resulting emission pattern of “photons” (the analogous force carriers in this theory) looks surprisingly similar to standard synchrotron radiation, fueling renewed hopes that these techniques may be useful to illuminate aspects of jet physics at hadronic colliders.