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T: Fachverband Teilchenphysik

T 83: Quantenfeldtheorie 1

T 83.2: Vortrag

Mittwoch, 26. März 2014, 17:00–17:15, P15

Dilaton Quantum Gravity — •Tobias Henz, Jan Martin Pawlowski, Andreas Rodigast, and Christof Wetterich — Institut für Theoretische Physik, Universität Heidelberg

We propose a simple fixed point scenario in the renormalization flow of a scalar dilaton coupled to gravity. This would render gravity non-perturbatively renormalizable and thus constitute a viable theory of quantum gravity. On the fixed point dilatation symmetry is exact and the quantum effective action takes a very simple form. Realistic gravity with a nonzero Planck mass is obtained through a nonzero expectation value for the scalar field, constituting a spontaneous scale symmetry breaking. Furthermore, relevant couplings for the flow away from the fixed point can be associated with a 'dilatation anomaly' that is responsible for dynamical dark energy. For the proposed fixed point and flow away from it the cosmological 'constant' vanishes for asymptotic time.