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Calendar of Physics Talks Vienna
| Fermion Pairing and the Effective Scalar Boson of the 2D Conformal Anomaly |
| Speaker: | Daniel Blaschke (Los Alamos National Laboratory, Theory Division) |
| Abstract: | Quantum fields in a curved background space lead to an anomalous trace of the total energy momentum tensor which can become macroscopic near black hole horizons. In two dimensions, the resulting effective action is the non-local Polyakov action. This effective action can be written in a local form by introducing one effective scalar field whose properties may hold the key to a better understanding of quantum effects in the near horizon region. In the present work, we found a curious relationship between tree graphs of stress-energy tensors of this new scalar field, and one-loop graphs of stress-energy tensors in terms of the original quantum fields. In particular, when starting from fermions the new scalar may be interpreted as an "interpolating" field describing intermediate two-fermion states. Finally, we compare our results to the chiral anomaly situation known from the Schwinger … |
| Date: | Mon, 21.07.2014 |
| Time: | 10:00 |
| Location: | Institute for Theoretical Physics – Vienna University of Technology, Seminar room 136, Wiedner Hauptstraße 8 – 10, 10th floor, B (yellow tower) |
| Contact: | Em.Univ.Prof. DI Dr. Manfred Schweda |
| Gauged Linear Sigma Models, disk partition function and nonabelian matrix factorizations |
| Speaker: | Mauricio Romo (Kavli IPMU) |
| Abstract: | I will explain how the supersymmetric disk partition function Z_{D^2}
of gauged linear sigma models relate to the central charge of objects
in the category of B-branes of a Calabi-Yau (CY). The advantage of
this approach is that Z_{D^2} provides an expression at every point
in the quantum corrected moduli space of the CY. The B-branes in
these models are realized naturally as matrix factorizations,
equivariant under the gauge group. I will explain how to relate them
to more familiar objects such as coherent sheaves on the CY and show
applications of this result to different type of CYs, including more
exotic non-complete intersections.
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| Date: | Mon, 21.07.2014 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Institute for Theoretical Physics – Vienna University of Technology, Seminar room 136, Wiedner Hauptstraße 8 – 10, 10th floor, B (yellow tower) |
| Contact: | Johanna Knapp |
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