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Calendar of Physics Talks Vienna
| Beyond General Relativity: causality issues and geometric inflation |
| Speaker: | Jose Edelstein (Santiago de Compostela U.) |
| Abstract: | We will explore the consequences of imposing consistency conditions in the introduction of higher curvature corrections to the Einstein-Hilbert Lagrangian. We will discuss two separate issues. First, we will argue that causality and unitarity put some tough restrictions at tree level, pointing in the direction of a UV stringy completion. Second, we will show that it is possible to write down an action given by an infinite series in the Riemann tensor with nice properties in terms of its spectrum and cosmology, which suggests a tantalizing mechanism of geometric inflation. |
| Date: | Tue, 21.01.2020 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, D. Grumiller |
| Topics in massive and partially massless gravity |
| Speaker: | Cedric Deffayet (CNRS Paris, IAP and IHES) |
| Abstract: | The wish to "give a mass to the graviton" (or to make gravity finite range) is old
and has motivations ranging from cosmology to the achievement of a theoretical
challenge. After reviewing the attempts in this direction and their numerous obstacles,
I will discuss recent progresses. In a second part of the talk, I will introduce some our
results on the construction of a consistent partially massless graviton on curved
backgrounds as well as that of a theory of multiple partially massless such fields.
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| Date: | Thu, 23.01.2020 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel, D. Fajman |
| Baryons as Solitons: EDMs and other properties from Holographic QCD |
| Speaker: | Lorenzo Bartolini (Univ. Pisa and TU Wien) |
| Abstract: | In this talk I will introduce Skyrme's intuition that baryons can be topological solitons in an effective theory of mesons: this will be the starting point to describe how it is realized in the context of the top-down model of holographic QCD of Sakai-Sugimoto and expose recent results of my work in the field. First, I will show that a Generalized Skyrme Model, enjoying a potential which is sextic in derivatives can be recovered from the holographic description by integrating out ω-like vector mesons. Second I will discuss CP-violation via QCD θ angle and the holographic of the electric dipole moment of the nucleons and the deuteron. Last, I will discuss explicit isospin breaking showing that, as a first approximation, a model of the baryon-soliton as a symmetric top can qualitatively produce splittings in the mass spectra of isospin multiplets. |
| Date: | Thu, 23.01.2020 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | Institute for Theoretical Physics, TU Wien, Seminar room 10th floor (yellow area), Wiedner Haupstr. 8-10, 1040 |
| Contact: | Anton Rebhan |
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