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Calendar of Physics Talks Vienna
| Testing General Relativity with Cosmological Observations |
| Speaker: | Ruth Durrer (Geneva) |
| Abstract: | General Relativity (GR) is immensely successful. With the late discovery of gravitational waves from black hole and neutron star mergers, it has passed all the tests with flying colors.But so far,observations have mainly tested the vacuum equations of GR.The most important non-vacuum case, cosmology, is in agreement with GR only after the introduction of
two otherwise unknown components,'Dark Matter' and 'Dark Energy'which amount to about 96% of the total energy budget of the present Universe. This lead people in the field to question the validity of GR for cosmology. Might it be that GR is flawed on large, cosmological scales? Or in the presence of matter in general? But how can we test Einstein's equation in the presence of matter? Can't we simply move any modification of the Einstein tensor to the right hand side and call it a 'dark matter/energy' component? |
| Date: | Thu, 03.11.2022 |
| Time: | 15:15 |
| Duration: | 60 min |
| Location: | via ZOOM https://univienna.zoom.us/j/6540036841?pwd=SytyVkZJZzNyRG9lMm13ejlHeHRRUT09 |
| Contact: | P. Chrusciel, D. Fajman |
| Searches for physics beyond the standard model with ultra-cold neutrons: updates on the search for the neutron electric dipole moment and new constraints on the hidden sector |
| Speaker: | Stephanie Roccia (Université Grenoble Alpes) |
| Abstract: | In this seminar I will present two complementary searches for physics beyond the standard model using ultracold neutrons. First, I will present the status of the search for the neutron electric dipole moment at PSI with the n2EDM experiment. Experiments searching for a permanent electric dipole moment of the neutron (nEDM) aim at discovering new sources of CP violation beyond the Standard Model of particle physics and understanding the origin of the matter-antimatter asymmetry of the Universe. So far, no evidence for such an intrinsic property was observed, neither for the neutron nor for any other system. In a second part, I will present a search for an oscillation of the neutron into a hidden neutron performed at the ILL a review current constraints on the hidden sector which is one candidate for the dark matter. |
| Date: | Fri, 04.11.2022 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | ATI Hörsaal/https://tuwien.zoom.us/j/93672218922?pwd=dEZNQ2liVzRNNURvNmVWVE5KUWRiQT09 |
| Contact: | Rene Sedmik |
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