Laser Spectroscopy of Antihydrogen and Fundamental Symmetry Tests

PhD defence, Friday 18 May 2018, Bruno Ximenez Rodrigues Alves.

2018.05.18 | Trine Berndt Turtiainen Scheelke

Bruno Ximenez Rodrigues Alves

The Standard Model of Particle Physics predicts that matter and antimatter should have been created in equal amounts in early stages of the universe. However, our universe seems to be pretty much empty of antimatter and this is known as the baryon asymmetry. A comparison between matter and antimatter properties constitutes a test of the charge conjugation-parity-time reversal (CPT) symmetry and any violation of this symmetry can open the doors for new physics and a possible explanation for the baryon asymmetry. An excellent candidate for this study is the antihydrogen, the bound state of a positron and an antiproton. This thesis reports on the measurement of the narrow 1S-2S transition in trapped antihydrogen, the laser setup to probe the transition and techniques developed to produced trapped antihydrogen. Our best measurement of the resonance frequency of the 1S-2S transition has a resolution of  2 parts in 1012, and is consistent with what is expected according to the CPT symmetry. 

The PhD research program was completed at CERN in the ALPHA experiment.

This résumé is prepared by the PhD student

Time: Friday May 18 2018 at 12 pm
Place: 1525-626, Department of Physics and Astronomy, Ny Munkegade 120, 8000 Aarhus C
Title of PhD thesis: Antihydrogen laser spectroscopy and fundamental symmetry tests
Contact information:
Bruno Ximenez R. Alves, e-mail:, tel.: + 33 075 149 8033
Members of the assessment committee:
Head of Laboratory Paolo Crivelli, Department of Physics ETH Zurich
Professor of Physics Klaus Jungmann, University of Groningen.
Professor Steen Hannestad, Department of Physics and Astronomy, Aarhus University (chair)
Main supervisor:

Professor Jeffrey S. Hangst, Department of physics and astronomy, Aarhus University
Language: The PhD thesis will be defended in English

The defence is public.
The dissertation is available for reading at the Graduate School of Science and Technology/GSST,
Ny Munkegade 120, building 1520, rooms 128-134, 8000 Aarhus C.

PhD defence
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Revised 17.05.2018