München 2006 – scientific programme

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GR: Gravitation und Relativitätstheorie

GR 404: Quantengravitation: andere Zug
änge

GR 404.3: Talk

Thursday, March 23, 2006, 17:10–17:30, K

Phase space reduction through horizon constraints — •Daniel Grumiller — Institute for Theoretical Physics, University of Leipzig, Augustusplatz 10-11, D-04109 Leipzig

Requiring the presence of a horizon imposes constraints on the physical phase space. After a careful analysis of dilaton gravity in 2D with boundaries (including the Schwarzschild and Witten black holes as prominent examples), it is shown that the classical physical phase space is smaller as compared to the generic case if horizon constraints are imposed. Conversely, the number of gauge symmetries is larger for the horizon scenario. In agreement with a recent conjecture by ’t Hooft, we thus find that physical degrees of freedom are converted into gauge degrees of freedom at a horizon.