Karlsruhe 2011 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 1: Hauptvorträge Montag: Quantengravitation und Quantengravitationsphänomenologie

GR 1.3: Hauptvortrag

Montag, 28. März 2011, 15:30–16:15, 20.40: 101

Dynamics and diffeomorphism symmetry in discrete quantum gravity — •Bianca Dittrich — AEI, Potsdam, Germany

Diffeomorphism symmetry is the underlying symmetry of general relativity and deeply intertwined with its dynamics. The notion of diffeomorphism symmetry is however often obscured in discrete gravity, which underlies most of the current quantum gravity models. We will propose a notion of diffeomorphism symmetry in discrete models and find that such a symmetry is weakly broken in many models. We will explain the connection to the problem of finding a consistent canonical dynamics for discrete gravity. To overcome these problems we will discuss methods to construct models with exact symmetries via so called perfect actions which involves a renormalization group analysis of the discrete quantum gravity models.