Julian Heeck

Postdoc in Dr. Werner Rodejohann's research group MANITOP, part of the Lindner division Particle and Astroparticle Physics at the Max-Planck-Institut für Kernphysik (MPIK) in Heidelberg, Germany.





Max-Planck-Institut für Kernphysik
Postfach 10 39 80
69029 Heidelberg

Office: Gentner Laboratory, room 342
Phone: +49 (0)6221 516 814
Fax: +49 (0)6221 516 872
Email: julian.heeck [at] mpi-hd.mpg.de

Research interests:

  • Neutrino physics
  • Additional gauge symmetries
  • Dark matter
  • Leptogenesis
  • Sterile neutrinos
  • ...

Publications and preprints:

A full list can be found at arXiv, NASA ADS or INSPIRE.

Conferences, schools, talks, and proceedings:


PhD thesis:

    Neutrinos and Abelian Gauge Symmetries [pdf],
    Heidelberg University and MPIK Heidelberg, May 2014.


    We study the intimate connection between neutrinos and simple abelian gauge symmetries U(1), starting from the observation that the full global symmetry group of the Standard Model, G = U(1)BL × U(1)LeLμ × U(1)LμLτ, can be promoted to a local symmetry group by introducing three right-handed neutrinos—automatically making neutrinos massive. The unflavored part U(1)BL is linked to the Dirac vs. Majorana nature of neutrinos; we discuss the B L landscape—including lepton-number-violating Dirac neutrinos—and implications for neutrinos, the baryon asymmetry, and experiments. Flavored subgroups U(1)G can shed light on the peculiar leptonic mixing pattern and mass ordering; we show how normal, inverted, and quasi-degenerate mass hierarchy can arise from a U(1)in a simple and testable manner. We furthermore present all U(1)G that can enforce viable texture zeros in the neutrino mass matrices. Beyond G, symmetries U(1)DM in the dark matter sector can give rise to naturally light sterile neutrinos, which provide a new portal between visible and dark sector, and also resolve some longstanding anomalies in neutrino experiments. Further topics under consideration are the mixing of vector bosons with the Z boson, as well as the Stückelberg mechanism. The latter raises the question why the photon should be massless—or stable for that matter!

PhD supported by:

International Max Planck Research School for Precision Tests of Fundamental Symmetries (IMPRS-PTFS)
Heidelberg Graduate School of Fundamental Physics (HGSFP)