Technical University of Munich
Associate Professorship of Theoretische Physik des frühen Universums (Prof. Garbrecht)
James-Franck-Str. 1
85748 Garching b. München
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.
Journal of High Energy Physics
Abstract: We derive the coupled dynamics between the bubble wall and the plasma from first principles using nonequilibrium quantum field theory. The commonly used equation of motion of the bubble wall in the…
Journal of High Energy Physics
Abstract: Recent years have seen a great improvement in the computation of CP-conserving and CP-violating equilibration rates for leptogenesis. These are relevant for the relativistic regime of the sterile…
Physical Review D
Abstract: Using the 2PI effective action formalism, we study false vacuum decay beyond the quadratic approximation of the path integral. We derive a coupled system of equations for the bounce and the…
Journal of High Energy Physics
Abstract: Extracting information about a system’s metastable ground state energy employing functional methods usually hinges on utilizing the late-time behavior of the Euclidean propagator, practically impeding…
Journal of Cosmology and Astroparticle Physics
Abstract: We demonstrate that in the presence of a light scalar spectator field, vacuum transitions taking place during inflation can produce large, potentially detectable non-Gaussian signatures in the…
Universe
Abstract: We discuss matters related to the point that topological quantization in the strong interaction is a consequence of an infinite spacetime volume. Because of the ensuing order of limits, i.e., infinite…
Physical Review D
Abstract: We investigate the potential of a minimal scotogenic model with two additional scalar doublets and a single heavy Majorana fermion to explain neutrino masses, dark matter, and the baryon asymmetry of…
Journal of High Energy Physics
Abstract: Assuming a toroidal space with finite volume, we derive analytically the full one-loop vacuum energy for a scalar field tunnelling between two degenerate vacua, taking into account discrete momentum.…
Physical Review D
Abstract: In the context of false vacuum decay at zero temperature, it is well known that bubbles expand with uniform proper acceleration. We show that this uniformly accelerating expansion suffers from an…
Journal of Cosmology and Astroparticle Physics
Abstract: With axions now a primary candidate for dark matter, understanding their indirect astrophysical signatures is of paramount importance. Key to this is the production of photons from axions in…
| Title | Dates | Duration | Type | Lecturer (assistant) |
|---|---|---|---|---|
| Current Topics in Particle Physics Theory |
|
2 | SE | |
| Current Topics in Theoretical Physics of the Early Universe |
|
2 | SE | |
| Exercise to Theoretical Physics 2 (Electrodnamics) |
|
2 | UE |
B. Garbrecht [L]
|
| Open Tutorial for Theoretical Physics 2 (Electrodynamics) |
|
2 | UE |
B. Garbrecht [L]
|
| Seminar for Tutors in Theoretical Physics 2 (Electrodnamics) |
|
2 | SE | |
| Theoretical Physics 2 (Electrodnamics) |
|
4 | VO |
| Title | Dates | Duration | Type | Lecturer (assistant) |
|---|---|---|---|---|
| Current Topics in Particle Physics Theory |
|
2 | SE | |
| Current Topics in Theoretical Physics of the Early Universe |
|
2 | SE | |
| Seminar for Tutors in Theoretical Particle Physics |
|
2 | SE | |
| Theoretical Particle Physics |
|
4 | VO | |
| Tutorial to Theoretical Particle Physics |
|
2 | UE |
B. Garbrecht [L]
|