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Calendar of Physics Talks Vienna
| Non-perturbative strings, asymptotic safety, and the swampland |
| Speaker: | Alessia Platania (Perimeter Institute) |
| Abstract: | Quantum gravity is undoubtfully one of the most important missing pieces in the understanding of the mathematical structure of our universe.The impossibility of consistently quantizing gravity via perturbative quantum field theory has led to a plethora of different proposals,
from asymptotically safe gravity to non-local gravity, loop quantum gravity,and string theory. Different approaches face different problems
and have succeeded in different areas. Yet,on the conceptual side,it is not obvious that all these frameworks are inequivalent or unrelated:
some theories may be low-energy approximations of others, or could even provide different mathematical descriptions of the same physics. On the technical side, the knowledge gained in an approach could be useful to investigate certain aspects of others. In this spirit, I will review progress in connecting and contrasting two theories |
| Date: | Tue, 25.04.2023 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | TU Sem.R. DA gruen 05 (Freihaus, TU Wien, Wiedner Hauptstrasse 8) |
| Contact: | S. Fredenhagen, D. Grumiller, E. Battista, R. Ruzziconi |
| X-ray Spectroscopy and Mars Sample Return: A Tale for Four Generations of Mars Rovers |
| Speaker: | Scott Van Bommel (Washington University in St. Lous) |
| Abstract: | Since the Alpha Proton X-ray Spectrometer on the 1997 Sojourner rover, X-ray spectrometers have flown on every successful NASA Mars rover mission. The Sojourner, Spirit, Opportunity, Curiosity, and Perseverance Mars rovers have provided key data that continues to shape our understanding of Mars. While orbital assets provide broad-scale information of the martian surface, rovers have proven key to elucidating our understanding of Marsâ paleoclimate and evolution to present day. X-ray spectrometers such as the Alpha Particle X-ray Spectrometer (APXS) on Spirit, Opportunity, and Curiosity, and the Planetary Instrument for X-ray Lithochemistry (PIXL) on Perseverance, have been instrumental in seeking out signs of past water, assessing ancient habitability, and selecting ideal samples to be cached on the martian surface.
This presentation will discuss the evolution of Mars rover X-ray spectr |
| Date: | Thu, 27.04.2023 |
| Time: | 10:00 |
| Location: | TU Mainbuilidng, Karlsplatz 13 |
| Contact: | Hartmut Abele and Irina Pradler |
| Some rigidity results for compact initial data sets |
| Speaker: | Abraao Mendes (Maceio, Brasil) |
| Abstract: | In this lecture, we aim to present some rigidity results for compact initial data sets, in both the boundary and no boundary cases.
For example, under natural energy, boundary, and topological conditions, we obtain a global version of a well-known result of H. Bray, S. Brendle, and A. Neves.
We also prove some extensions of results obtained, in a previous work, by M. Eichmair, G.J. Galloway, and the author. Finally, as time permits, we are going
to present a number of examples in order to illustrate some of the results presented in this lecture. This is part of a joint work with G.J. Galloway. |
| Date: | Thu, 27.04.2023 |
| Time: | 15:30 |
| Duration: | 60 min |
| Location: | via ZOOM - https://univienna.zoom.us/j/6540036841?pwd=SytyVkZJZzNyRG9lMm13ejlHeHRRUT09 Meeting ID: 654 003 6841 Passcode: Gs4brS |
| Contact: | P. Chrusciel, D. Fajman |
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