Quantum Colloquium on April 14, 2025

Speaker at the colloquium will be Michael Doser, researcher at CERN, the European Center for Nuclear Research in Geneva, Switzerland.

Topic: Anti-matter experiments at CERN: pulsed production of antiprotonic systems for precision tests of fundamental symmetries.

The production of cold antihydrogen atoms at CERN's Antiproton Decelerator (AD) has opened up the possibility to perform direct measurements of the Earth's gravitational acceleration on antimatter bodies. This is the main goal of the AEgIS collaboration: to measure the value of g using a pulsed source of cold horizontally travelling antihydrogen via a moiré deflectometer/Talbot-Lau interferometer. The first milestone of pulsed production of antihydrogen [1] using a resonant charge-exchange reaction between cold trapped antiprotons and Rydberg positronium (or Ps, the atomic bound state of a positron and an electron) atoms, and the techniques it relies on, will be presented, with a view to the first gravitational experiments using a pulsed beam of antihydrogen in the near future. Further physics directions in AEgIS relying on similar pulsed interactions in positronium [2] or between antiprotons and Rydberg atoms and molecules will also be touched upon, as they open up unexplored venues in nuclear physics, searches for dark matter, production of low energy antineutrons and novel precision tests of fundamental symmetries, inter alia in Rydberg hydrogen-like Highly Charged Ions.

[1] C. Amsler et al. (AEgIS collaboration), Pulsed production of antihydrogen, Commun. Phys. 4, 19 (2021) https://doi.org/10.1038/s42005-020-00494-z
[2] L.T. Glöggler et al. (AEgIS Collaboration), https://link.aps.org/doi/10.1103/PhysRevLett.132.083402
DOI: 10.1103/PhysRevLett.132.083402

To predict the number of participants, please fill out the application form by April 10, 2025: https://forms.office.com/e/7V5gMveLjN.

Photography and filming will take place during the event, the materials will be posted on the social media and website of the Latvian Quantum Initiative.