Graviton emission from a soft brane

Theories with compact extra spatial dimensions felt only by gravity are subject to direct experimental tests if the compactification volume is large. Estimates of high-energy collider observables induced by graviton radiation into extra dimensions are usually given assuming rigid branes. This may overestimate the accessibility of these theories. Brane fluctuations soften the coupling of graviton radiation, and reduce our ability to see effects in high-energy collisions. We calculate the size of this suppression on single jet plus gravitons at the CERN Large Hadron Collider (LHC) and single photon plus gravitons at an e⁺e^- linear collider. We advocate the use of a brane softening variable as an additional parameter when comparing theory predictions to data.