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Calendar of Physics Talks Vienna
| Gravitational waves in Einstein-Cartan theory |
| Speaker: | Emmanuele Battista (Univ. Vienna) |
| Abstract: | In this seminar we investigate the topic of gravitational waves in the context of Einstein-Cartan theory by exploiting the Blanchet-Damour formalism.Einstein-Cartan model has been formulated to extend the concepts of general relativity to the microphysical realm in order to establish a connection between gravity and the other fundamental interactions.In this framework the quantum intrinsic spin carried by elementary particles is described geometrically by means of the torsion tensor,which is defined as the antisymmetric part of the affine connection.On the other hand,the Blanchet-Damour approach has been devised in general relativity to deal with the radiation produced by compact binary systems during their early inspiralling stage.It employs two approximation techniques:the multipolar-post-Minkowskian scheme, which combines a post-Minkowskian algorithm and a multipolar decomposition ... |
| Date: | Tue, 11.01.2022 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Zoom https://univienna.zoom.us/j/97109700615?pwd=cC9Ndks4S0dkcVZRUHE2a2pSa1dGdz09 ID meeting: 971 0970 0615 Passcode: 366570 |
| Contact: | D. Grumiller, S. Fredenhagen, E. Battista |
| Operational reconstruction of quantum particle statistics |
| Speaker: | Borivoje Dakic (Vienna) |
| Abstract: | A curious fact about indistinguishable quantum particles is that there are only two types of statistics:bosonic and fermionic.The question of why only these two types of particles are admissible is usually solved via the discrete exchange symmetry of their associated quantum states. Within this approach,one proceeds naturally with the construction of (anti)symmetric wave functions and the corresponding Fock space.In this talk,I will present an alternative, operational approach in which the Fock space is postulated from the beginning.I will show that the unitary evolution of non-interacting particles is compatible with the Fock space structure only in certain cases.More precisely,I will show that the representations of the unitary group associated with the non-interacting model are classified according to the type of particle statistics.We have found the standard bosonic and fermionic ... |
| Date: | Thu, 13.01.2022 |
| Time: | 14:00 |
| Location: | ZOOM https://univienna.zoom.us/j/6540036841?pwd=SytyVkZJZzNyRG9lMm13ejlHeHRRUT09 |
| Contact: | P. Chrusciel, D. Fajman |
| Anisotropic jet momentum broadening and jet polarization |
| Speaker: | Siggi Hauksson (McGill University; IPhT, Saclay) |
| Abstract: | Heavy-ion collisions produce high-temperature QCD matter known as the quark-gluon plasma (QGP). Jets probe the QGP as they traverse the medium and undergo transverse momentum broadening. Recent work has shown that this momentum broadening is highly anisotropic in the early stages of heavy-ion collisions. In the first half of this talk, we analyze in detail how anisotropic momentum broadening leads to net polarization of jet partons emitted in medium-induced bremsstrahlung. Measuring jet polarization in experiments could therefore give a new way of measuring medium anisotropy. In the second half of the talk, we provide our own calculation of jet broadening in an anisotropic, weakly-coupled quark-gluon plasma. A main result is that momentum broadening is substantially reduced at lower momenta compared with an equilibrium medium. |
| Date: | Thu, 13.01.2022 |
| Time: | 16:30 |
| Duration: | 60 min |
| Location: | https://tuwien.zoom.us/j/95482849369?pwd=SkU2WU5hMVJBQWsyVlFXRlRvQlIvdz09 |
| Contact: | Kirill Boguslavski, Laura Donnay |
| High field Magnetic Resonance Micro-imaging meets Synchrotron particle accelerators: 3-Dimensional Dosimetry of small sized ion beams for tumor therapy |
| Speaker: | Andreas Berg (Medical University of Vienna) |
| Abstract: | At High field MR-Center Medical University of Vienna an Ultra-High-field Magnetic Resonance (MR) tomograph at B = 7T for human applications has been additionally equipped with a prototype strong microscopy insert within a research project. This system offers unique additional significant advantages with regard to signal-to-noise-ratio (SNR), spatial resolution, and diffusion weighing for quantitative measurement of the mobility of molecules. Out of the multifield applications possible with this system the results of a pilot project in cooperation with Radiation Oncology and MEDAUSTRON are presented: the visualization of the dose distribution of small pencil beams at few mm diameter of accelerated proton particle beams (E = 62 MeV) with high potential interest for the treatment of small tumors and metastases. The methodical principles for a) MR-microscopy at spatial scales of about 32 µm |
| Date: | Fri, 14.01.2022 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | Hörsaal ATI/ https://tuwien.zoom.us/j/99712909944?pwd=dmlybGJYa2tTUWdFQlNNRmJ6YWx3dz09 |
| Contact: | Philipp Haslinger |
| Transverse Momentum Dependent factorization beyond leading power |
| Speaker: | Alexey Vladimirov (Regensburg University) |
| Abstract: | Transverse momentum dependent(TMD)actorization is an important tool for the description of differential cross-sections and for the exploration of hadron's intrinsic structure.The leading-power TMD factorization is known in detail,while power corrections remain almost unexplored.In this talk I present a novel approach to the TMD factorization(transverse momentum dependent operator expansion).This approach is methodologically similar to the light-cone operator product expansion and allows for a systematic computation of power corrections to TMD factorization.In particular it gives rise to the definition of TMD-twist which sorts TMD operators with respect to their evolution properties and provides a certain decomposition of power corrections into kinematic and genuine ones.As a demonstration of the approach I present the computation of the next-to-leading power correction at next-to-leading |
| Date: | Fri, 14.01.2022 |
| Time: | 16:00 |
| Location: | ZOOM https://univienna.zoom.us/j/93427906843?pwd=YjhSejdUVW16QjVQYUh5TVNSNFNhQT09 Meeting ID: 934 2790 6843 Passcode: 073703 |
| Contact: | A. Hoang, M. Procura |
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