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Calendar of Physics Talks Vienna
| Rotating quantum crystals and vibrating atom pairs |
| Speaker: | Martin Zwierlein (Massachusetts Institute of Technology Cambridge, MA, USA) |
| Abstract: | Experiments on utlracold quantum gases can realize paradigmatic states of matter, from Bose-Einstein condensates and fermionic superfluids to supersolids and topological states. Novel techniques allow a microscopic view of such systems: Individual quantum vortices and individual atoms in many-body states can be imaged in situ. I will present two recent experiments at MIT: The demonstration of a quantum register made of fermion pairs and the crystallization of bosonic quantum Hall states. The âglueâ between these rather orthogonal topics is the harmonic oscillator that underlies these experiments. For the quantum register we observed long-lasting coherence of the relative and center-of-mass motion of fermion pairs on the scale of ten seconds, which may serve as a novel type of qubit. In experiments with rotating quantum gases, we employ a harmonic trap to perfectly cancel the centrifugal |
| Date: | Mon, 11.04.2022 |
| Time: | 17:00 |
| Duration: | 45 min |
| Location: | ATI Hörsaal/https://tuwien.zoom.us/j/93672218922?pwd=dEZNQ2liVzRNNURvNmVWVE5KUWRiQT09 |
| Contact: | Julian Leonard |
| Charge and antipodal matching across spatial infinity |
| Speaker: | Kévin Nguyen (King's Coll. London) |
| Abstract: | We derive the antipodal matching relations used to demonstrate the equivalence between soft graviton theorems and BMS charge conservation across spatial infinity. We provide a precise map between Bondi data at null infinity and Beig--Schmidt data at spatial infinity in a context appropriate to the gravitational scattering problem and celestial holography. In addition, we explicitly match the various proposals of BMS charges at null infinity found in the literature with the conserved charges at spatial infinity. |
| Date: | Tue, 12.04.2022 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Sem.R. DA, gruen 05 (TU Wien, Freihaus) |
| Contact: | Laura Donnay, Daniel Grumiller, Iva Lovrekovic, Romain Ruzziconi |
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