Models with large extra dimensions
Igor' Pavlovich Volobuev · 2011
We discuss the history of the hypothesis about the extra dimensions and the physics of models with large extra dimensions with an emphasis on the Randall-Sundrum model with two branes.For this model the physical degrees of freedom are explicitly isolated, which include the massless graviton, a tower of massive gravitons and a massless scalar, -the radion.The couplings of these fields to matter are shown to be different on different branes.In particular, it turns out that the original Randall-Sundrum model is phenomenologically unacceptable for the observer on the brane with negative tension, because the massless radion couples too strongly to matter on this brane; this flaw can be eliminated by stabilizing the distance between the branes, which makes the radion massive.We discuss in detail the phenomenology of the stabilized Randall-Sundrum model in the cases, where the center of mass energy is below or above the production threshhold of the first Kaluza-Klein resonance.For both cases we found specific changes of the distribution tails for the processes of SM particles scattering at the Tevatron and the LHC.