Maths HEP Lunchtime Seminars: Cosmology without Scalar Fields
7 March 2008 13:00 in CM221
Can we do Cosmology without using scalar fields? What if they don't exist? Can we at least contain their use? In this talk I will discuss the possibility of generating the scalar curvature perturbation in the Universe using a massive gauge field instead. The mechanism can be realised either through direct couplings of the gauge field to gravity or due to the non-trivial evolution of the gauge kinetic function in the context of supergravity. In both cases, an approximately scale invariant spectrum is obtained with natural values of the parameters. How this spectrum gives rise to the observed curvature perturbation while avoiding a large-scale anisotropy will be demonstrated. The talk will include a brief pedagogic introduction on the physics of inflation and the curvature perturbation.