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Calendar of Physics Talks Vienna
| Examples and explicit construction of Hadamard states |
| Speaker: | Claudio Dappiaggi (ESI) (Fakultät für Physik) |
| Abstract: | im Rahmen des Seminars für Mathematische Physik |
| Date: | Tue, 26.01.2010 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | J. Yngvason |
| Speaker: | Dimitri Vassilevich (ABC Federal U.) |
| Abstract: | It is well known that for a given Poisson structure one has infinitely
many star products related through the Kontsevich gauge transformations.
These gauge transformations have an infinite functional dimension (i.e.,
correspond to an infinite number of degrees of freedom per point of the
base manifold). I show that on a symplectic manifold this freedom may be
almost completely eliminated if one extends the star product to all tensor
fields in a covariant way and impose some natural conditions on the tensor
algebra. The remaining ambiguity either correspond to constant
renormalizations to the symplectic structure, or to maps between
classically equivalent field theory actions. I also discuss how one can
introduce the Riemannian metric in this approach and the consequences of
our results for noncommutative gravity theories.
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| Date: | Thu, 28.01.2010 |
| Time: | 10:15 |
| Duration: | 60 min |
| Location: | Schroedinger Seminar Room, University of Vienna |
| Contact: | Daniel Grumiller |
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