Karlsruhe 2011 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 8: Kosmologie

GR 8.3: Talk

Thursday, March 31, 2011, 09:10–09:30, 20.40: 101

Frame Dependence of Quantum Corrections in Cosmology — •Christian Steinwachs — Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany

In the context of cosmological models based on an inflaton field non-minimally coupled to gravity, one can remove the non-minimal coupling by performing a conformal transformation of the metric at the price of a more complicated potential.

On a classical level this is just a mathematical trick and the two frames – the original Jordan frame and the minimally coupled Einstein frame – are equivalent. The question is now if this still holds at the quantum level. We will answer this question for a very general model by calculating and comparing explicitly the corresponding results at the one-loop level. This model is suitable for most of the cosmological applications.