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Theoretical Physics of the Early Universe

Prof. Björn Garbrecht

Research Field

The observed Universe can be very well described in terms of the Standard Model (SM) of Particle Physics, gravitation, neutrinos and Cold Dark Matter. The present understanding ranges from times below the Electroweak Phase transition, 10^-12 seconds after the Bang, until today, 13.8 billion years later. The cosmic evolution depends sensitively on initial conditions, such as the matter-antimatter asymmetry, the Dark Matter abundance and density perturbations, that eventually grow into galaxies.

Understanding the initial conditions is one of the key motivations for exploring Physics beyond the SM. Cosmology thus complements laboratory experiments such as the Large Hadron Collider. The particular research interests of our group encompass the origin of the matter-antimatter asymmetry and of density perturbations from inflation. In particular, we develop theoretical methods for calculations on the dynamics and reactions of elementary particles at very high temperatures and in curved spacetimes, i.e. under conditions present in the Early Universe.


James-Franck-Str. 1/II
85748 Garching b. München

Members of the Research Group





Other Staff


Course with Participations of Group Members

Offers for Theses in the Group

Freeze-in dark matter and their implications on cosmology and terrestrial experiments
So far, we can explain only 5% of our Universe by the standard model of particle physics. 25% of our Universe, however, consists out of “dark matter”. While we have different experimental hints for its existence, we do not know yet its true nature. With new experimental possibilities in the near future, so-called freeze-in scenarios receive increased interest. We want to study these models with respect to a modified cosmological history, their link to neutrino physics and their implications for experiments in more detail.
suitable as
  • Master’s Thesis Nuclear, Particle, and Astrophysics
Supervisor: Julia Harz
Lepton number violating interactions as a guiding principle for the neutrino nature

Even though we know that neutrinos must have masses, we do not know yet which mechanism generates them. One possibility is that they are their own antiparticles, being of “Majorana” type. An experimental hint for this would be the measurement of lepton number violating interactions e.g. at the LHC, neutrinoless double beta decay or meson decays. In an effective field theory, we want to study the complemenatry of these interactions and their experimental prospects in more detail.

suitable as
  • Master’s Thesis Nuclear, Particle, and Astrophysics
Supervisor: Julia Harz

Current and Finished Theses in the Group

Aspects of Leptogenesis - a Case Study for a Scotogenic Model with Type-II Seesaw
Abschlussarbeit im Bachelorstudiengang Physik
Themensteller(in): Julia Harz
The Effective Action in Quantum Mechanics
Abschlussarbeit im Bachelorstudiengang Physik
Themensteller(in): Björn Garbrecht
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