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Calendar of Physics Talks Vienna
| A Photonic Floquet Scattering Matrix for Wavefront-Shaping in Time-Periodic Media (Vienna Theory Lunch Seminar) |
| Speaker: | David Globosits (TU Wien) |
| Abstract: | The physics of waves in time-varying media provides numerous opportunities for wave control that are unattainable with static media. In particular, Floquet systems with a periodic time modulation are currently of considerable interest. In my talk, I will demonstrate how the scattering properties of a finite Floquet medium can be correctly described by a static Floquet scattering matrix, which satisfies a pseudo-unitary relation. Using this Floquet scattering matrix, I will further show how one can identify light pulses that are optimally shaped both in their spatial and temporal degrees of freedom for the optical micromanipulation of time-varying media.
[[part of the "Vienna Theory Lunch Seminar, see https://lunch-seminar.univie.ac.at ]] |
| Date: | Tue, 30.04.2024 |
| Time: | 12:30 |
| Duration: | 75 min |
| Location: | TU Wien: Wiedner Hauptstr. 8-10, yellow area, 10th floor, seminar room DB10E11 |
| Contact: | Florian Lindenbauer |
| Characterization of rational SCFTs: Complex Multiplication, Mirror Symmetry and Hodge Theory |
| Speaker: | Abhiram Kidambi (MPI for Mathematics in the Sciences) |
| Abstract: | One is probably aware that classification of RCFTs has been studied at a steady and formal pace over the past few decades. But often when we are asked to define or characterize an RCFT who target spaces are X, there are different answers and characterisations. (X can be an abelian variety like a torus, or a an algebraic variety like K3 surfaces etc.) Phenomenologically, rationality can explain things like electroweak gaugino dark matter, gauge coupling unification and small gravitino mass, and attribute them to large chiral algebra on the worldsheet string theory, and not to a larger symmetry of the spacetime field theory. Mathematically, Rational CFTs provide a physical way to determine points of arithmetic in the moduli space of a variety. For the case of X = d dimensional tori, these various characterisations as I will explain are equivalent if and only if there are further condition |
| Date: | Tue, 30.04.2024 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Schroedinger HS, Boltzmanngasse 5 |
| Contact: | Piotr T. Chrusciel |
| New Higgses at the Electroweak Scale and differential top quark distributions |
| Speaker: | Andreas Crivellin (University of Zurich, PSI) |
| Abstract: | Significant hints for new Higgses with masses around 95 GeV and 152 GeV have been accumulated in recent years. In this talk, I will discuss the relevant measurements as well as possible models which can explain these excesses.
Furthermore, I show how the new Higgses could explain the deviations between the theory predictions and the measurements of differential top quark distributions.
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| Date: | Tue, 30.04.2024 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Hoersaal, Boltzmanngasse 5, 5. Stock |
| Contact: | M. Procura |
| Towards quantum networks, simulations and computations based on color center qubits |
| Speaker: | Tim Taminiau (TU Delft) |
| Abstract: | Spins associated to optically active solid-state defects provide a promising platform for quantum networks and distributed quantum simulations and computations [1-5]. The defect electron spin can be detected, prepared and measured optically and can be used to create entangled states over long distances [2]. Furthermore, the electron spin can be used to detect and control nuclear spins in its environment, which provide additional quantum bits [1].
In this talk, I will discuss our recent progress in controlling such electron-nuclear spin systems for quantum networks and for distributed quantum computations and simulations. In particular, I will show that we can image systems with up to 50 nuclear spins with atomic-scale resolution [4,6], and I will discuss how these spins can be used as simulators of many-body physics [4] and as quantum bits for quantum networks and distributed quantum co |
| Date: | Fri, 03.05.2024 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | Helmut Rauch HÃÂörsaal ATI |
| Contact: | Andrew Kanagin |
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