3 papers
gr-qc2016
Diffeomorphism-invariant averaging in quantum gravity and cosmology
Anthony W. H. Preston
This thesis concerns research undertaken in two related topics concerning high-energy gravitational physics. The first is the construction of a manifestly diffeomorphism-invariant…
gr-qc2016
Cosmological backreaction in higher-derivative gravity expansions
Anthony W. H. Preston
We calculate a general effective stress-energy tensor induced by cosmological inhomogeneity in effective theories of gravity where the action is Taylor-expandable in the Riemann te…
hep-th2016
Manifestly diffeomorphism invariant classical Exact Renormalization Group
Tim R. Morris, Anthony W. H. Preston
We construct a manifestly diffeomorphism invariant Wilsonian (Exact) Renormalization Group for classical gravity, and begin the construction for quantum gravity. We demonstrate tha…