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We prove a conjectured lower bound on 〈T__(x)〉
in any state ψ of a CFT on Minkowski space, dubbed the Quantum… Expand We investigate the asymptotic safety conjecture for quantum gravity including curvature invariants beyond Ricci scalars. Our… Expand We show how to perform accurate, nonperturbative and controlled calculations in quantum field theory in d dimensions. We use the… Expand This thesis aims to identify the key features of the asymptotic safety scenario and discuss how it could provide a well-defined… Expand A bstractWe discuss the nature of quantum field theories involving gravity that are classically scale-invariant. We show that… Expand We study quantum gravity in more than four dimensions with renormalisation group methods. We find a non-trivial ultraviolet fixed… Expand A new exact renormalization group equation for the effective average action of Euclidean quantum gravity is constructed. It is… Expand We study (2,2) supersymmetric field theories on two-dimensional worldsheet with boundaries. We determine D-branes (boundary… Expand The non-trivial ultraviolet fixed point in quantum gravity is calculated by means of the exact renormalization group equation in… Expand Daily average solar proton flux data for the years 1963-1984 (two solar cycles) have been used in a proton energy degradation… Expand