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Calendar of Physics Talks Vienna
| Forecasting detection and parameter estimation capabilities for the Einstein Telescope |
| Speaker: | Ulyana Dupletsa (Gran Sasso) |
| Abstract: | https://indico.cern.ch/event/1444373/
Einstein Telescope (ET) is a European project for a next-generation gravitational-wave detector. ET is expected to explore a broad range of science case studies. The reference design is based on a triangular shape of three nested detectors with 10 km arms, where each arm consists of a âxylophoneâ configuration made of one interferometer tuned towards high frequencies and the other, cryogenic, towards low frequencies. Evaluating ETâs detection and parameter estimation capabilities is a mandatory step in its planning process.
The talk will overview data analysis tools that allow us to do forecasts. In particular, we will focus on GWFish, a software that simulates gravitational-wave detector networks and calculates measurement uncertainties based on the Fisher matrix approximation. We will then present the ET reference design results and consider diffe |
| Date: | Tue, 10.09.2024 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | HEPHY, Postsparkasse, 3rd floor, Seminarroom 1 |
| Contact: | Claudius Krause (HEPHY) |
| The mass angular momentum inequality |
| Speaker: | Gilbert Weinstein (Ariel University) |
| Abstract: | We show that either there is a counterexample to black hole uniqueness, in the form of a regular axisymmetric stationary vacuum spacetime with an asymptotically flat end and multiple degenerate horizons which is âÂÂADM stableâÂÂ, or the following statement holds. Complete, simply connected, maximal initial data sets for the Einstein equations with multiple ends that are either asymptotically flat or asymptotically cylindrical, admit an ADM mass lower bound given by the square root of total angular momentum, under the assumption of nonnegative energy density and axisymmetry. Moreover, equality is achieved bound only for a constant time slice of an extreme Kerr spacetime. The proof is based on a novel flow of singular harmonic maps with hyperbolic plane target, under which the renormalized harmonic energy is monotonically nonincreasing. |
| Date: | Wed, 11.09.2024 |
| Time: | 11:00 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | D. Fajman |
| Uncertainty estimation in Recurrent Neural Networks for Space Weather forecasting |
| Speaker: | Daniel Conde (IFIC Valencia) |
| Abstract: | https://indico.cern.ch/event/1449075/
Uncertainty estimation in Space Weather forecasts provides critical insights for making more informed and dependable decisions to protect essential ground-based infrastructures from the adverse effects of geomagnetic disturbances. Geomagnetic storms are disturbances of the geomagnetic field caused by interactions between the solar wind and particle populations mainly in the Earth's magnetosphere. These time-varying magnetic fields induce electrical currents on long ground-based conductors that can damage power transmission grids and other critical infrastructures on Earth. This study concentrates on the uncertainty estimation in predicting the SYM-H activity index, which quantifies the strength and duration of geomagnetic storms based on ground-based geomagnetic field observations at low and mid-latitudes. Utilizing IMF data from the ACE spacecraft |
| Date: | Fri, 13.09.2024 |
| Time: | 11:00 |
| Duration: | 60 min |
| Location: | HEPHY, Postsparkasse, 3rd floor, Seminarroom 1 |
| Contact: | Claudius Krause (HEPHY) |
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