The cosmological constant problem and gravity in the infraredTools Stefanyszyn, David (2016) The cosmological constant problem and gravity in the infrared. PhD thesis, University of Nottingham.
AbstractIn this thesis we explore low energy extensions of Einstein's theory of General Relativity (GR). Initially our motivation will be the cosmological constant problem where large radiative corrections due to quantum field theories minimally coupled to the dynamical metric in GR leads to unacceptably large spacetime curvatures. We will discuss the cosmological constant problem in detail, paying special attention to how it affects the global structure of a spacetime whose dynamics are dictated by GR. With this in mind we will present and discuss recently proposed global modifications of GR which in the semiclassical limit sequester the radiatively unstable loop corrections to the cosmological constant from the spacetime curvature. This is achieved by supplementing the local dynamics of GR with highly nontrivial global constraints, and we demonstrate how this can be achieved in a theory which is manifestly local. In this theory we will also consider the effects of an early universe phase transition on the late time dynamics.
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