Docentship lecture: Baryon asymmetry-why does it (anti-)matter?

  • Date: –11:15
  • Location: Ångströmlaboratoriet, Lägerhyddsvägen 1 Å80121 and Zoom:
  • Lecturer: Tekn. Dr. Patrik Adlarson
  • Website
  • Organiser: Division of Nuclear Physics, Department of Physics and Astronomy
  • Contact person: Patrik Adlarson
  • Docentföreläsning

The Department of Physics and Astronomy hereby invite all interested to a docentship lecture in the subject of physics.

Chairperson: Professor Stefan Leupold

Representative of the Docentship Committee: Professor Stephan Pomp

The visible and stable matter in our universe consists of particles like protons, neutrons and electrons. The surplus of matter in our universe was not always this way but at the Big Bang, we believe that there was an equal amount of antimatter. Antimatter is similar to matter except for opposite charges and quantum numbers. When matter and anti-matter interact, they annihilate into high energetic light particles. For some reason a small matter excess remained, which became the building blocks of stars, planets and biological life. This matter-antimatter asymmetry is expected to be due to a physical mechanism, baryogenesis. Although the complete explanation of this mechanism is unknown, we know that it must result in difference between matter and anti-matter. One such condition is that Charge conjugation combined with Parity (CP) symmetry must be violated. The CP symmetry means that the laws of physics are the same for a particle and for its anti-particle (C) with its spatial coordinates mirrored (P). That CP violation exists is well established experimentally, but the Standard Model CP-violation is not large enough to explain the observed matter-antimatter asymmetry. What happened to the anti-matter? This lecture will be about symmetries, CP-violation and how researchers at Uppsala University contribute to our understanding of one of the most pressing questions in fundamental physics.

The lecture is an obligatory teaching test for those applying for admittance as docent and it should be possible for students and others with basic academic education in the relevant field to follow it. The lecture lasts 40-45 minutes with subsequent discussion. The lecture will be given in Swedish.


Last modified: 2022-12-12