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Calendar of Physics Talks Vienna
| Finite element methods for gauge theories (Vienna Theory Lunch Seminar) |
| Speaker: | Srinath Bulusu (TU Wien) |
| Abstract: |
The variational principle lies in the heart of classical physics: given an action $S[\phi]$ which depends on degrees of freedom $\phi$ the evolution of the physical system follows the equations of motion which can be obtained by means of variation $\delta_{\phi} S = 0$. This in combination with the theory of Partial Differential Equations (PDEs) naturally leads to the so-called Finite Element Method (FEM) - a practial approach to numerical simulations that has established itself in the fields of structural mechanics, fluid mechanics and electrodynamics. [...] [[part of the "Vienna Theory Lunch Seminar, see https://lunch-seminar.univie.ac.at ]]
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| Date: | Tue, 12.12.2023 |
| Time: | 12:30 |
| Duration: | 75 min |
| Location: | TU Wien: Wiedner Hauptstr. 8-10, yellow area, 10th floor, seminar room DB10E11 |
| Contact: | Florian Lindenbauer |
| Electroweak input schemes in Standard Model effective field theory |
| Speaker: | Anke Biekoetter (JGU Mainz) |
| Abstract: | Standard Model effective field theory (SMEFT) enables us to universally describe the effects of heavy new physics at lower energy scales.
Recently, there has been a lot of progress on calculating next-to-leading order (NLO) effects in SMEFT.
In this talk, we will discuss how the choice of the electroweak input scheme influences the convergence at NLO and how universal, scheme-dependent corrections can be resummed.
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| Date: | Tue, 12.12.2023 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultaet fuer Physik, Erwin Schroedinger-HS, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, M. Procura, T. Corbett |
| Symplectic Singularities in Physics: Their Origins and Significance |
| Speaker: | Marcus Sperling (University of Vienna) |
| Abstract: | Symplectic singularities, also known as hyper-Kahler singularities, encompass well-known geometric spaces such as the Kleinian surface singularities or the moduli space of instantons. Recently, a new class of symplectic singularities has emerged through the construction based on a physics model known as the 3d N=4 Coulomb branch.
In this talk, I aim to provide an introduction and overview of symplectic singularities in general, with a particular focus on the 3d N=4 Coulomb branches. I will place special emphasis on the symplectic singularities that manifest as moduli spaces of vacua within supersymmetric field theories containing 8 supercharges in space-time dimensions ranging from 3 to 6. These instances showcase how geometric features offer elegant descriptions of strongly coupled phenomena. |
| Date: | Wed, 13.12.2023 |
| Time: | 14:15 |
| Location: | Seminarraum A, Waehringer Strasse 17, 2nd Floor |
| Contact: | Piotr T. Chrusciel |
| Maurer-Cartan perturbation theory and scattering amplitudes in general relativity |
| Speaker: | Andrea Nuetzi (Stanford) |
| Abstract: | I will describe a differential graded Lie algebra tailored to study perturbations of Minkowski spacetime, including asymptotics. This differential graded Lie algebra is defined on the conformal compactification of Minkowski spacetime. Its Maurer-Cartan equation is equivalent to the vacuum Einstein equations, and is symmetric hyperbolic including across the boundary of Minkowski spacetime. I will compare this to Friedrich's conformal vacuum field equations, a key difference is that we do not use a conformal factor as an unknown, and null infinity is a fixed locus independent of the unknown. I will then introduce an iteration scheme that gives an order-by-order construction of formal power series solutions about Minkowski. This is based on standard Maurer-Cartan perturbation theory and renormalization of the mass and angular momentum charges. |
| Date: | Fri, 15.12.2023 |
| Time: | 13:00 |
| Location: | library on WähringerstraÃÂe 17, 1st floor |
| Contact: | P. Chrusciel |
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