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Calendar of Physics Talks Vienna
| Higher-spin theories from a Hamiltonian viewpoint |
| Speaker: | Andrea Campoleoni (ULB Brussels) |
| Abstract: | im Rahmen des Seminars für Mathematische Physik: After an introduction to Fronsdal’s description of the dynamics of free particles of spin greater than two, we show how one can recast the action principle in Hamiltonian form. Following an approach developed by Regge and Teitelboim for general relativity, the latter step is then used to identify “higher-spin” conserved charges which generalise total energy and angular momentum. To this end, we specialise the discussion to fields propagating on an Anti de Sitter background and we discuss how the previous results
fit within the conjectured AdS/CFT correspondences involving higher spins.
We conclude with an overview of the potential applications of a closed-form expression for higher-spin charges.
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| Date: | Tue, 18.10.2016 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, H. Steinacker |
| On-shell conditions in theories with flavor mixing |
| Speaker: | Maximilian Löschner (Univ. Wien) |
| Abstract: | In this talk, I will present a derivation of the on-shell renormalization conditions in theories where mixing among different particle flavors or families can not be neglected. This subject is already important for precision calculations in the Standard Model, but even more so in models beyond, e.g. when neutrino masses and an unspecified number of right-handed neutrinos needs to be taken into account. The derivation will be carried out for scalar and fermionic fields in theories with and without parity conservation.
I will also discuss the specifics of Majorana fermions and show how these conditions
are implemented in renormalization.
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| Date: | Tue, 18.10.2016 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
| Singularities in General Relativity |
| Speaker: | Bernd Schmidt (Albert Einstein Inst., Golm) |
| Abstract: | im Rahmen des Seminars in Geometric Analysis and Physics
(GAP Seminar) |
| Date: | Thu, 20.10.2016 |
| Time: | 10:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | V. Branding (Fak. Math, U.V.) D. Fajman (Fak. Phys, U.V.) J. Joudioux (Fak. Phys, U.V.) |
| Transition conditions for isolated self-gravitating bodies |
| Speaker: | Bernd Schmidt (Albert Einstein Inst., Golm) |
| Abstract: | Im Rahmen des Literaturseminars der Gravitationsphysik: For freely floating self-gravitating bodies the boundary conditions on physical grounds are: the vanishing of the normal stress at the boundary for all times. We expect that these conditions together with initial data determine a unique solution of the evolution equations. However, if the density of the matter at the surface of the body is positive, further "transition conditions" are needed to imply sufficient differentiability of the solution inside and outside the body. I will discuss the origin of these conditions first for a simple model problem and then for self-gravitating bodies in Newton's and Einstein's theory of gravity. |
| Date: | Thu, 20.10.2016 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
| BTZ black holes, warped AdS3 black holes and flat space cosmologies in higher derivative gravity theories |
| Speaker: | Celine Zwikel (Brussels U. & Solvay Inst.) |
| Abstract: | In this talk, we consider warped AdS3 black holes, BTZ black holes and flat space cosmologies in generic higher derivative gravity theories in 2+1 dimensions. Using the covariant phase space formalism, we prove the match between the bulk Iyer-Wald entropy of these solutions and the field theory entropy for the corresponding asymptotic symmetry algebras (CFT2, Warped CFT2, BMS3). This talk is based on the following papers: arXiv:1604.02120 and arXiv:1602.09089. |
| Date: | Thu, 20.10.2016 |
| Time: | 16:00 |
| Location: | SEM 136, TU Wien, Freihaus, 10th floor (Wiedner Hauptstr. 8-10, A-1040 Vienna) |
| Contact: | Daniel Grumiller |
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