Project level: Honours

New singlet particles with a very small mixing with the Higgs boson would be produced by decays from other heavier particles in the early Universe, in the so-called 'freeze-in' process. This process is expected to change quite a bit if the singlets have substantial self-interactions. The project is to explore those changes, and to build a general framework for calculating the resulting cosmological abundance of such singlets, so that it can be combined with constraints from astroparticle physics (worked out by an existing student) in a global statistical fit of such models.

Starting point: arXiv:1812.07585

Project members

Dr Pat Scott

ARC Future Fellowship
School of Mathematics and Physics