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Calendar of Physics Talks Vienna
| Twisted eleven-dimensional supergravity and exceptional Lie algebras |
| Speaker: | Ingmar Saberi (LMU) |
| Abstract: | In recent years, there has been a great deal of progress on ideas related to twisted supergravity,
building on the definition given by Costello and Li. Much of what is explicitly known about these theories
comes from the topological B-model, whose string field theory conjecturally produces the holomorphic twist of type IIB supergravity.
Progress on eleven-dimensional supergravity has been hindered, in part, by the lack of such a worldsheet approach.
I will discuss a rigorous computation of the twist of the free eleven-dimensional supergravity multiplet,
as well as an interacting BV theory with this field content that passes a large number of consistency checks.
Surprisingly, the resulting holomorphic theory on flat space is closely related to the infinite-dimensional
exceptional simple Lie superalgebra E(5,10). This is joint work with Surya Raghavendran and Brian Williams. |
| Date: | Tue, 21.06.2022 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Zoom https://univienna.zoom.us/j/64871597658?pwd=eDdWUEIwd0l5Z211RkovWVZhdE9xUT09 ID meeting: 648 7159 7658 Passcode: 641201 |
| Contact: | S. Fredenhagen, D. Grumiller, E. Battista, R. Ruzziconi |
| EFT effects in VBS: lessons from UV complete models |
| Speaker: | Dieter Zeppenfeld (KIT) |
| Abstract: | Vector boson scattering (VBS), with its intricate cancellation between Higgs and electroweak boson exchanges,
has in recent years advanced from theoretical consideration to experimental investigation at the LHC.
Via its sensitivity to quartic gauge couplings, it has opened new roads to BSM searches.
The talk will first consider such BSM effects in an effective field theory (EFT) language, including the unitarity problems of a truncated EFT,
as a bottom-up approach. This will be contrasted to a top-down approach, within a large class of UV-complete, i.e. renormalizable models
of BSM physics. The top-down approach allows to quantify the validity range of the EFT, it sheds light on unitarization procedures,
but above all it suggests improved strategies for BSM searches in VBS. |
| Date: | Tue, 21.06.2022 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Hoersaal, Fakultaet für Physik, Boltzmanngasse 5, 5. Stock ZOOM https://univienna.zoom.us/j/93427906843?pwd=YjhSejdUVW16QjVQYUh5TVNSNFNhQT09 Meeti |
| Contact: | A. Hoang, M. Procura |
| Double Null Data and the Characteristic Problem in General Relativity |
| Speaker: | Gabriel Sanchez-Perez (University of Salamanca) |
| Abstract: | General Relativity admits a well-posed characteristic initial value problem, where data is given on two transverse, null hypersurfaces.
In this seminar, a new approach in which the initial data is defined abstractly and in a fully diffeomorphism and gauge-covariant way is presented. In order to achieve this we employ the so-called hypersurface data formalism, a framework in which one can study general hypersurfaces of any causal character from an abstract point of view (i.e. independent of any spacetime notion). Our abstract geometrization puts the characteristic problem on a similar footing as the standard Cauchy problem in General Relativity, in the sense that the initial data has been completely detached from the spacetime one wishes to construct.
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| Date: | Wed, 22.06.2022 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | Seminarraum A, Gravitationsphysik, Waehringer Strasse 17, 2. Stock ZOOM https://univienna.zoom.us/j/6540036841?pwd=SytyVkZJZzNyRG9lMm13ejlHeHRRUT09 |
| Contact: | P. Chrusciel, D. Fajman |
| Interferometric Unruh Detectors for Bose-Einstein Condensates |
| Speaker: | Sebastian Erne, TU Wien |
| Abstract: | Ultracold atoms and their non-equilibrium evolution present an ideal platform to study fundamental processes of quantum field theory and the relaxation dynamics of quantum many-body systems.
Here, I will present recent results and future prospects for analogue quantum simulators based on effective field theory descriptions.
In particular, I will discuss the measurement of the analogue circular Unruh effect via local interferometric two-frequency detectors [1,2].
The continuous non-destructive measurements of cold atom systems paves the way to study this fundamental and yet still untested prediction of quantum field theory,
that a linearly accelerated observer in the vacuum observes a thermal state at the Unruh-temperature. |
| Date: | Thu, 23.06.2022 |
| Time: | 15:00 |
| Duration: | 60 min |
| Location: | Gravitationsphysik, Seminarraum A, Waehringerstrasse 17, 2nd floor |
| Contact: | P. Chrusciel, D. Fajman |
| IMBM Seminar: "Physics @ Null Boundaries, Edition 2022" |
| Speaker: | Shahin Sheikh Jabbari (Institute for Research in Fundamental Sciences (IPM)) |
| Abstract: | To formulate gravity in spacetimes bounded by an arbitrary hypothetical null boundary, boundary degrees of freedom (d.o.f) should be added to account for the d.o.f and dynamics in the spacetime regions excised behind the boundary. In D dimensional case, null boundary d.o.f are labelled by D charges defined at D-2 dimensional spacelike slices of the null boundary. While boundary modes can have their own boundary dynamics, their interaction with the bulk modes is governed by flux-balance equations which may be interpreted as diffusion equations describing dissolution of bulk gravitons into the boundary. From boundary viewpoint, boundary d.o.f obey local thermodynamical equations at the boundary. Our description suggests a new semiclassical quantization where boundary d.o.f are quantized while bulk is classical. This semiclassical treatment may be relevant to questions in black hole physics |
| Date: | Thu, 23.06.2022 |
| Time: | 16:30 |
| Duration: | 60 min |
| Location: | TU Wien, Freihaus, Seminar room on 9th floor |
| Contact: | Daniel Grumiller, Iva Lovrekovic |
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