Calendar of Physics Talks Vienna

The Embedding of gauged N = 8 supergravity into 11 dimensions
Speaker:Olaf Krüger (Univ. Wien)
Abstract:I will talk about the embedding of the bosonic section of gauged N=8 supergravity into 11 dimensions. The fields of 11-dimensional supergravity are reformulated in a non-linear way, such that their supersymmetry transformations can be compared to the four-dimensional ones. In this way, non-linear relations between the redefined higher-dimensional fields and the fields of N=8 supergravity can be found. This is the basis to construct direct uplift Ansätze for the bosonic fields of 11-dimensional supergravity in terms of the four-dimensional ones. The obtained formulae can be used to construct group invariant solutions of the higher dimensional theory. Examples are the uplift of G_2 gauged supergravity and the construction of a SO(3)xSO(3) invariant solution of 11-dimensional supergravity.
Date: Tue, 10.10.2017
Time: 14:15
Duration: 60 min
Location:TU Wien, Freihaus, SEM 136, 10. Stock, Wiedner Hauptstr. 8-10,1040 Wien
Contact:S. Fredenhagen, O. Krüger

Precision Flavour Physics and Lattice QCD: A path to discovering new physics
Speaker:Christopher T. Sachrajda (University of Southampton)
Abstract:1. Vorlesung im Rahmen der Schrödinger-Gastprofessur 2017
Date: Tue, 10.10.2017
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, H. Neufeld, G. Ecker

Quantum field theory models on noncommutative spaces
Speaker:Harald Grosse (Univ. Wien)
Abstract:Im Rahmen des joint relativity-mathematical physics seminar: In order to improve QFT in 4 D we (HG and Raimar Wulkenhaar) studies models over quantized space-times. They become Matrix models, which share all interesting features of a QFT: A graphical description with Feynman rules, power counting dimension, regularisation and renormalisation, divergence of the perturbation series.- We report on models, where we can give exact non-perturbative formulae for all renormalised correlation functions. We describe a map, which projects these matrix correlation functions to Schwinger functions of an ordinary quantum field theory. The Schwinger 2-point functions satisfies in some models the Osterwalder-Schrader axioms.
Date: Thu, 12.10.2017
Time: 14:00
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien
Contact:P.T. Chrusciel, S. Fredenhagen

Antilinearity Rather than Hermiticity as a Guiding Principle for Quantum Theory
Speaker:Philip D. Mannheim (Department of Physics, University of Connecticut)
Abstract:We show that having an antilinear symmetry is the most general condition that one can impose on a quantum theory for which one can have an inner product that is time independent, have a Hamiltonian that is self-adjoint, and have energy eigenvalues that are all real. For each of these properties Hermiticity is only a sufficient condition but not a necessary one, with Hermiticity thus being the special case in which the Hamiltonian has both antilinearity and Hermiticity. As well as being the necessary condition for the reality of energy eigenvalues, antilinearity in addition allows for the physically interesting cases of manifestly non-Hermitian but nonetheless self-adjoint Hamiltonians that have energy eigenvalues that appear in complex conjugate pairs, or that are Jordan block and cannot be diagonalized at all.
Date: Thu, 12.10.2017
Time: 16:00
Location:Seminar room FH DB gelb 10, Institute for Theoretical Physics – Vienna University of Technology, Wiedner Hauptstraße 8 – 10, 10th floor, B (yellow tower)
Contact:Univ.Prof. Dr. Joachim Burgdörfer

Quantum Conformal Gravity
Speaker:Philip Mannheim (U. Connecticut)
Abstract:Conformal symmetry is a natural symmetry in physics since it is the full symmetry of the light cone. If all particles are to get their masses by symmetry breaking then conformal symmetry is the symmetry of the unbroken Lagrangian. Like Yang-Mills theories conformal symmetry has a local extension, namely conformal gravity, a pure metric-based candidate alternative to the non-conformal invariant standard Newton-Einstein theory of gravity. With its dimensionless coupling constant quantum conformal gravity is power counting renormalizable. Since its equations of motion are fourth-order derivative equations conformal gravity has long been thought to possess unacceptable ghost states of negative norm that would violate unitarity. However on constructing the quantum Hilbert space Bender and Mannheim found that this not to be the case. Conformal gravity is thus offered as a completely consist...
Date: Fri, 13.10.2017
Time: 16:15
Duration: 60 min
Location:SEM 136, TU Wien, Freihaus, 10th floor (Wiedner Hauptstr. 8-10, A-1040 Vienna)
Contact:Daniel Grumiller