CPT

Calendar of Physics Talks Vienna

Simulating double soft gluon emission
Speaker:Peter Majcen (University of Vienna)
Abstract:Particle collisions with large momentum transfer and coloured particles can be in principle computed using perturbative QCD. However in this context it is possible that terms of order $\alpha_s^n L^m$, where $L$ is a large logarithm arise. Such terms originate from gluon emission where the energy is small in comparison to the large momentum transfer of the process. Non global observables are sensitive to such emissions. In my talk I will present how such contribution from single and double soft gluon emission could be resummed in a Monte Carlo simulation.
Date: Tue, 22.06.2021
Time: 16:00
Duration: 60 min
Location:https://univienna.zoom.us/j/93104933847?pwd=N0FrL0E1UHlkQWRhQTlQODVkZ3kvUT09 Meeting ID: 931 0493 3847 Passcode: 674625
Contact:A. Hoang, P. Stoffer

Sympathetic Cooling of Single Protons (and Antiprotons)
Speaker:Markus Wiesinger (Max Planck Institute for Nuclear Physics, Heidelberg, Germany)
Abstract:Within the BASE collaboration we perform most precise tests of the CPT symmetry in the baryon sector by measurements of the fundamental properties of protons and antiprotons. Our recent 300 ppt measurement of the proton magnetic moment at the proton g-factor experiment in Mainz is predominantly limited by statistics. The reason is that the current use of sub-thermal cooling of a single proton by a resistive method is extremely time-consuming and leads to cycle times of hours. To overcome this limitation, sympathetic cooling by laser-cooled Be+ ions in a common-end-cap Penning trap is being developed: The method not only promises to produce protons and antiprotons with mK temperatures within tens of seconds but also achieves separation of the cooled and the refrigerator ion. We present the current setup ... [for full abstract please visit: https://indico.smi.oeaw.ac.at/event/396/]
Date: Wed, 23.06.2021
Time: 16:30
Duration: 60 min
Location:Webinar: request zoom link before 12:00 23Jun2021 via email martin.simon at oeaw.ac.at
Contact:Prof. Dr. Eberhard Widmann, Dr. Martin Simon

The non-linear stability of the Schwarzschild family of black holes
Speaker:Gustav Holzegel (Imperial, London)
Abstract:Joint Relativity-Geometric Analysis seminar: I will discuss recent work with M. Dafermos, I. Rodnianski and M. Taylor proving the full finite codimension asymptotic stability of the Schwarzschild family of black holes in the exterior of the black hole region. The proof is expressed entirely in physical space and based on our previous understanding of linear stability of the Schwarzschild family in a double null gauge.
Date: Thu, 24.06.2021
Time: 15:00
Duration: 60 min
Location:https://univienna.zoom.us/j/6540036841?pwd=SytyVkZJZzNyRG9lMm13ejlHeHRRUT09
Contact:Piotr Chrusciel, Andy Cap, Roland Donninger, Michael Eichmair

Towards Macroscopic Quantum Physics with Levitated Particles
Speaker:Oriol Romero-Isart (Universität Innsbruck)
Abstract:We will discuss the motivation and prospects to explore macroscopic quantum physics with levitated nanoparticles in the context of state-of-the-art experiments. Particular emphasis will be put into the challenges imposed by decoherence. In this context, we will present our recent proposal (arXiv: 2012.12260) to generate large quantum delocalization of a levitated nanoparticle using optimal control and the applications for force sensing and entangling the motion of particles via weak forces.
Date: Fri, 25.06.2021
Time: 14:00
Duration: 45 min
Location:Hörsaal ATI /on-line
Contact:Thorsten Schumm