Thomas Konstandin. Research

Output of a diffusion network as used for
electroweak baryogenesis calculations.

Comparison of the Lyman alpha power spectrum mesured
by BOSS with a phenomenological model.

The energy distribution on the surface of a colliding bubble
during a cosmolgical first-order phase transition.

Classes of Feynman diagrams that need to be resummed
to solve the Goldstone catastrophe in Landau gauge.

Phase space diagrams of the collapse of a dark matter halo in
1+1 dimensions using the Schrödinger-Poisson method.

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When it comes to baryogenesis mechanisms, I am mostly interested in electroweak baryogenesis at the scale of electroweak symmetry breaking. In particular, I use techniques from nonequilibrium quantum field theory to obtain a description of baryogenesis beyond the classical Boltzmann equations. A relatively new developement is hereby the attempt to link baryogenesis to flavor model building.

The large scale structures of the Universe are formed by the gravitational collapse of dark and baryonic matter. While this highly non-linear problem is mostly studied by simulations, the largest scales are eventually accessible to analytic methods. These are often based on the resummation of perturbative results or consist of relations that are based on symmetry arguments.

One potent source of gravitational waves are cosmological (first-order) phase transitions. The observation of the corresponding stochastic background of gravitational waves would make it possible to deduce important information on the underlying particle physics theory. This is well possible with the first generation of space-based gravitational wave interferometers, namely the LISA mission.