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Calendar of Physics Talks Vienna
| Visualizing Limits of Spacetimes |
| Speaker: | Emma Jakobsson (Stockholm) |
| Abstract: | The limit obtained when letting a free parameter of a spacetime approach a certain value is in general not unique, but depends on the
choice of coordinates. This ambiguity led Geroch to formulate a
definition of limits of a one-parameter family of spacetimes in 1969.
We have come up with an application of Geroch’s definition, which makes it possible to see the limiting procedure in pictures. The general idea is to let the spacetime under consideration---if possible---be represented by a 1+1-dimensional surface reflecting its essential causal structure, and embed this surface in 2+1-dimensional anti-de Sitter space. With the help of a conformally compactified picture of adS3 the result is reminiscent of a Penrose diagram, with the difference that the picture will change as we vary the parameter. The examples considered here are two different limits obtained when letting the charge . . |
| Date: | Thu, 28.05.2015 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
| Some rigidity results for static metrics |
| Speaker: | Lorenzo Mazzieri (Pisa) |
| Abstract: | im Rahmen des Lunchseminars der Gravitationsphysik: We present a new approach to the study of asymptotically flat static metrics in general relativity. Our method works in every dimension and it is based on a conformal splitting technique, which has been previously applied by the authors to the study of the geometric aspects of classical potential theory. The results are obtained in collaboration with V. Agostiniani. |
| Date: | Fri, 29.05.2015 |
| Time: | 13:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, common room, 1. Stock |
| Contact: | P.T. Chrusciel |
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