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Calendar of Physics Talks Vienna
| Poincaré duality and supergravity |
| Speaker: | John Huerta (LMU Munich) |
| Abstract: | The superfield formalism is an approach to supersymmetric field theories where the fields are functions on supermanifolds. We describe the peculiar features of supermanifolds that play a role in the superfield formalism, how these peculiar features lead to a novel form of Poincaré duality with no classical analogue, and sketch some of its applications to physics.
This is joint work with Konstantin Eder and Simone Noja. |
| Date: | Tue, 27.01.2026 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | S. Fredenhagen, M. Sperling |
| The improved Quantum Null Energy Condition |
| Speaker: | Ido Ben-Dayan (Ariel University) |
| Abstract: | By rearranging its terms, the Quantum Focusing Conjecture, can be viewed as a quantum energy condition, and we can consider various limits. A recent restricted version is a limiting form where the quantum focusing vanishes Θ → 0, and has been proven for Braneworld scenario. As a result, we derive an improved quantum null energy condition (INEC) that can be proven with field theory techniques. We sketch the proof, in the case of a class of conformal filed theories, where the modular Hamiltonian is known, and can be mapped onto the past light-cone. We find that the INEC holds given a condition on an integral of the energy momentum tensor on a finite segment. Finally, we suggest the implications of considering the energy conditions as fundamental and show how it will imply possible derivations of the different focusing conjectures. |
| Date: | Wed, 28.01.2026 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Seminar Room A, Waehringer Str. 17, 1090 Wien, 2nd floor |
| Contact: | D. Fajman |
| Gravity is Induced from Renormalization Group Flow |
| Speaker: | Shahin Sheikh Jabbari (IPM, Tehran) |
| Abstract: | We revisit the holographic renormalization group (RG) setting in which a 4-dimensional (4d) quantum field theory at a finite cutoff corresponds to/is described by the Einstein gravity on a part of AdS5 space, cutoff at a finite radius. This holographic setting has interesting and important implications for the 4d field theory: Deformation of the field theory by a certain combination involving the square of its energy-momentum tensor can be alternatively viewed as formulating the field theory on a background with a dynamical metric. Explicitly, starting with a non-gravitating 4d field theory in the UV, flowing to the IR, quantum effects that we compute using the classical 5d Einstein gravity theory, induce an effective 4d Einstein gravity theory. In other words, we show that gravity is not a fundamental force and is an effective description of quantum effects in the IR limit. |
| Date: | Thu, 29.01.2026 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Online; Zoom broadcast in DA08E10, Green tower, 8th floor, Wiedner Hauptstrasse 8-10 |
| Contact: | Ankit Aggarwal, Daniel Grumiller |
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