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Calendar of Physics Talks Vienna
| Quantized cosmological constant in 1+1d gravity with scalar matter |
| Speaker: | Simone Zonetti (CP3 - Centre for Cosmology, Particle Physics and Phenomenology Louvain-La-Neuve, Belgium) |
| Abstract: | Considering a model of gravity in 1+1 dimensions non-minimally coupled to scalar matter I will show how the realization of quantum constraints on physical states provides a mathematical mechanism to derive the value of the cosmological constant, accounting for the quantum contributions of matter and gravity.
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| Date: | Mon, 06.06.2011 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | SEM 136 (Freihaus, Wiedner Hauptstrasse 8-10), Institute for Theoretical Physics, Vienna University of Technology |
| Contact: | Daniel Grumiller |
| Attosecond physics - Ultrafast electron dynamics in atoms |
| Speaker: | Renate Pazourek (TU Wien) |
| Abstract: | With the ability to control and shape infrared laser fields and the generation of isolated attosecond light pulses by high harmonic generation a new research field ? attoscience - was born about ten years ago. Since then it has become possible to study electron dynamics in atoms, molecules and solids on it's natural time scale. After a general introduction to attosecond physics I will focus on ultrafast electron dynamics in atoms, in particular correlated electron dynamics in helium for which the time-dependent Schr¿dinger equation can still be solved numerically. I will present simulations for two-photon double ionization of helium and compare some of the calculated results with experiments. In addition, I will give an introduction to attosecond streaking, a pump-probe technique using an ultrashort extreme ultaviolet pulse and a synchronized IR laser field, which allows to extract time shifts between different photoionization events with attosecond precision. |
| Date: | Tue, 07.06.2011 |
| Time: | 12:30 |
| Duration: | 60 min |
| Location: | Uni Wien ( Boltzmanngasse 5, 5th floor, Schrödinger HS / large seminar room ) |
| Contact: | Sabine Ertl |
| The Geometry Behind Matrix Models for 3D SUSY Gauge Theories at Large N |
| Speaker: | Christopher P. Herzog (Princeton University) |
| Date: | Wed, 08.06.2011 |
| Time: | 15:00 |
| Duration: | 60 min |
| Location: | Institute for Theoretical Physics, TU Wien, SEM 136, 10th floor, Wiedner Hauptstr. 8-10, 1040 Wien |
| Contact: | Anton Rebhan, TU Wien |
| Dark matter; is this really a problem? |
| Speaker: | Prof. Donald G. Saari (Univ. of California Irvine) |
| Abstract: | The issue concerning "dark matter" comes from Newtonian
approximations for the full Newtonian N-body problem. As shown, when
combined with observed rotational velocities, this approach requires
mass levels that are significantly larger than what has been observed.
But, is this approximation method correct? By using analytic properties
of the Newtonian N-body problem to derive new relationships between
rotational velocity and mass values, it is shown that the conflict is
nowhere near as extreme as asserted in the literature. |
| Date: | Thu, 09.06.2011 |
| Time: | 10:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock |
| Contact: | P. T. Chrusciel |
| Soft and hard mesons in Chiral Perturbation Theory |
| Speaker: | Ilaria Jemos (Univ. Lund) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Thu, 09.06.2011 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Teilchenphysik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
| Speaker: | Erwann Delay (Avignon) |
| Abstract: | im Rahmen des Literaturseminars |
| Date: | Thu, 09.06.2011 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock |
| Contact: | P. T. Chrusciel |
| N=1 Vacua in N=2 Supergravity and String Theory |
| Speaker: | Hagen Triendl (IPhT/CEA Saclay) |
| Abstract: | We discuss N=1 vacua in spontaneously broken N=2
supergravities. We start by reviewing classical no-go theorems on
their existence and how
these no-go theorems can be circumvented for general N=2
supergravities. We construct stable N=1 vacua for any moduli space
that might arise in type II flux compactifications and discuss quantum
effects in the corresponding string theory compactifications. We also
show how integrating out the massive fields leads to an N=1 effective
theory at low energies and discuss to which extend moduli
stabilization takes place. |
| Date: | Thu, 09.06.2011 |
| Time: | 16:00 |
| Duration: | 90 min |
| Location: | TU Wien, Seminar room E136 |
| Contact: | Andreas Braun |
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