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Calendar of Physics Talks Vienna
| Galilean and Carrollian limits of non-relativistic strings |
| Speaker: | Gerben Oling (Nordita) |
| Abstract: | I will present and analyze two novel classes of non-relativistic string actions. Non-relativistic string theory usually refers to a particular limit of string theory that results in a non-relativistic spectrum, as I will briefly review from a modern geometrical perspective. However, the worldsheet geometry of such strings is still Lorentzian. Motivated in part by decoupling limits of N=4 SYM, I will introduce two related constructions that lead to novel classes of non-relativistic strings with Galilean and Carrollian structures on the worldsheet, respectively. Time permitting, I will briefly present their Hamiltonian constraint analysis, and I will comment on their potential relevance for accessing new solvable subsectors of AdS/CFT. |
| Date: | Tue, 21.03.2023 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | SEM.R.DA gruen 05 (Freihaus, TU Wien, Wiedner Hauptstrasse 8) |
| Contact: | D. Grumiller, S. Fredenhagen, E. Battista, R. Ruzziconi |
| The Hadronic Light-By-Light Contribution to the Muon g-2 in Triangle Kinematics at Short Distances |
| Speaker: | Michael Adam (Univ. Wien) |
| Abstract: | The Hadronic-Light-By-Light(HLbL)contribution is responsible for a significant part of the uncertainty in the present Standard Model predictionof the anomalous magnetic moment of the muon. Contributions to HLbL from the low-energy regime are determined precisely through dispersion relations for the low-lying intermediate states,while the operator product expansion and perturbative QCD provide constraints in the mixed and asymptotic regimes.How to properly match these different descriptions of HLbL is less understood and responsible for the largest part of the current uncertainty on HLbL.This thesis addresses this issue and provides the first steps towards a model-independent strategy fully based on dispersion relations to reduce uncertainties on the estimate of HLbL coming from the matching to short-distance constraints. To this end,we consider DRs for the HLbL scalar functions from ... |
| Date: | Tue, 21.03.2023 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Hoersaal, Fakultaet für Physik, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, M. Procura |
| Are there gravitons? And how do you couple quantum matter to classical gravity? |
| Speaker: | Domenico Giulini (Univ. Hannover) |
| Abstract: | I will review some classical arguments concerning the remoteness of direct graviton detection.
Treating gravity classically, the question arises how to consistently and reliably estimate the influence
of classical gravitational fields on the dynamics of quantum systems.
A review of the latter is given in https://arxiv.org/pdf/2207.05029.pdf |
| Date: | Thu, 23.03.2023 |
| Time: | 15:30 |
| Duration: | 60 min |
| Location: | on zoom https://univienna.zoom.us/j/6540036841?pwd=SytyVkZJZzNyRG9lMm13ejlHeHRRUT09 Meeting ID: 654 003 6841 Passcode: Gs4brS |
| Contact: | P. Chrusciel, D. Fajman |
| From Very Special Relativity to a gauge invariant graviton mass: gravitational waves and binary stars |
| Speaker: | Alessandro Santoni (Chile University) |
| Abstract: | Very Special Relativity (VSR) is a particular realization of Lorentz violation, which was presented for the first time by Cohen and Glashow in 2006 with the idea of introducing an alternative mechanism for neutrinos' masses. Since then, the ideas of VSR have been applied to many different areas. In this talk, after a short introduction to the key features of VSR, I will present its application to linearized gravity: we will see how, within the framework of VSR, it is possible to construct a coherent spin-2 free field theory, preserving the usual gauge invariance of linearized General Relativity while, at the same time, allowing for a non-zero graviton mass. Applying the geodesics' deviation equation to the VSR gravitational waves (GWs), I will give some possible estimations of the magnitude of the effects introduced by this novel theory for GWs. |
| Date: | Thu, 23.03.2023 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | Freihaus, Sem.R. DB gelb 10 |
| Contact: | Iva Lovrekovic |
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