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Calendar of Physics Talks Vienna
| String integrability of defect CFT and dynamical reflection matrices |
| Speaker: | Georgios Linardopoulos (Wigner Research Centre for Physics, Budapest) |
| Abstract: | The D3-D5 and D2-D4 probe-brane systems with nonzero worldvolume flux are holographically dual to N=4 super Yang-Mills and ABJM theoryin the presence of half-BPS domain walls. The two domain wallsystems are thought to be integrable; the evidence comes mainly from the studyof correlation functionsat weak coupling. In the present talk we show that the string theory duals of these systems are classically integrable.
In other words, the string boundary conditions on the probe branes preserve the integrability of the corresponding Green-Schwarz sigma models. This finding suggests that the dual domain wall systems
are integrable to all loop orders and for any value of the bond dimension. |
| Date: | Tue, 08.11.2022 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Seminarraum DB gelb 03 Freihaus, TU Wien, Wiedner Hauptstrasse 8 |
| Contact: | S. Fredenhagen, D. Grumiller, E. Battista, R. Ruzziconi |
| Energy Correlators for collider QCD |
| Speaker: | Jack Holguin (Ecole Polytechnique, Paris) |
| Abstract: | The ability to measure detailed aspects of the substructure of high energy jets passing through the quark-gluon plasma(QGP)has provided a completely new probe of its internal dynamics and of QCD. However
drawing robust conclusions from traditional jet substructure observables has been difficult.This is for two main reasons, one practical and one theoretical. The environment of a heavy ion collision is messy and traditional approaches to jet substructure often find that the backgrounds are largest in the regions of phase-space most sensitive to the QGP dynamics.Compounding this problem, the QGP has complicated multi-scale dynamics.Disentangling these scales has proved difficult for theorists, indeed debate still persists over the most basic mechanisms through which a jet interacts with the QGP. |
| Date: | Tue, 08.11.2022 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Hoersaal, Fakultaet für Physik, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, M. Procura |
| Direct detection of dark matter and the COSINUS experiment |
| Speaker: | Florian Reindl (OEAW, TU Wien, Hephy) |
| Abstract: | The quest for dark matter is one of the most pressing questions of modern physics. We know that it exists, but its(particle)nature remains in the dark. Direct dark matter detection experiments aim to detect interactions of dark matter particles in earth-bound detectors. Despite tremendous improvement in sensitivity over the last decades, all experiments report null results except for the DAMA experiment. DAMA has observed since the 1990s an annually modulating event rate in their NaI detectors compatible with dark matter particles in the milky way. To resolve the contradicting results in direct detection, experiments with the same target material -- NaI -- are needed to be immune against material and model dependencies. COSINUS is one of these experiments,
albeit the only one operating NaI as a cryogenic detector. |
| Date: | Thu, 10.11.2022 |
| Time: | 15:15 |
| Duration: | 60 min |
| Location: | Gravitationsphysik, Seminarraum A, Waehringerstrasse 17, 2nd floor |
| Contact: | P. Chrusciel, D. Fajman |
| Flat JT Gravity and the Schwarzian of BMS2 |
| Speaker: | Blagoje Oblak (Ecole Polytechnique) |
| Abstract: | This talk is devoted to Jackiw-Teitelboim (JT) gravity in Bondi gauge, with a vanishing cosmological constant. The asymptotic symmetries of the theory span an infinite-dimensional group commonly dubbed `BMS2' (for Bondi-Metzner-Sachs in two dimensions), but most of the existing literature reduces this group to its warped Virasoro subgroup. I shall argue that one can avoid this reduction and use the BMS2 group throughout. In particular, the boundary action of the system is a BMS-Schwarzian with an extra zero-mode, and its partition function is one-loop exact with respect to the Haar measure on (centrally extended) BMS2. The peculiarities of BMS2 are pointed out, including the fact that it has a single coadjoint orbit at fixed (real) central charges. [Based on arXiv:2112.14609.] |
| Date: | Thu, 10.11.2022 |
| Time: | 16:30 |
| Duration: | 60 min |
| Location: | Freihaus, Sem.R. DB gelb 10 |
| Contact: | Iva Lovrekovic, Romain Ruzziconi, Daniel Grumiller |
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