Julia Harz.
Research.


Research interests
•   Phenomenology of physics beyond the standard model
•   Precision Calculations
•   Interplay of particle physics and astroparticle physics
•   Supersymmetry
•   Dark matter
•   Leptogenesis
•   Lepton Number Violation
•   Inflation
As nature gives us different hints that the current Standard Model (SM) of particle physics cannot be the ultimate theory, I am in general interested in physics beyond the Standard Model (BSM). The idea of approaching new physics by considering various observed effects and combining their possible explanations to a more general theory motivates me in my work and makes BSM phenomenology to such a versatile field.
Especially, using the interplay of particle physics and cosmology, collider physics and astrophysics is in my opinion a promising strategy to approach the open questions regarding our understanding of physics beyond the Standard Model.
So far I have been working mostly on Supersymmetry (SUSY), a theory which could address the shortcomings of the SM. However, as I think one should always stay open minded for the unexpected, I am also interested in different model independent approaches.

Current projects
With current experiments like WMAP and PLANCK reaching a percent precision in the determination of the relic density, this observable sets a stringent bound on the MSSM parameter space and is, thus, commonly used in global fits and parameter studies. Current theoretical predictions for the relic abundance, however, do not meet this precision yet. To improve this, I am contributing to the calculation of SUSY-QCD corrections at next-to-leading order to (co)annihilation processes. Within this context, I have also performed different phenomenological analyses, e.g. with respect to light stop scenarios.
Combining cosmology and collider physics is not only interesting with respect to dark matter, but also regarding leptogenesis. In a model-independent approach, we assessed the question whether it is possible to falsify leptogenesis at the LHC. The interconnection between lepton number violating processes, experimental observations at the collider, low-energy and neutrino experiments, and deductions on the validity of leptogenesis or baryogenesis is also subject of current work.
My latest project was about flipped GUT inflation. Motivated by a small tensor-to-scalar ratio, observables point us to an inflationary potential which is related to the scale of grand unification. Therefore, it is interesting to further study to which extend it is possible that a phenomenological viable GUT model is able to explain this coincidence.