• Tuesday 28 September 2021 at 10:15 with Zoom: Timo Kärkkäinen (Budapest)
    Super-weakly coupled U(1)_z and GeV neutrinos
    Abstract: Super-weak force is a minimal extension of the standard model,  which adds three massive sterile Majorana neutrinos, a complex singlet scalar boson and a neutral massive vector boson to the particle spectrum. It aims to explain dark matter, accelerating expansion of the universe, neutrino mass generation, vacuum metastability, cosmic inflation and baryonic asymmetry of the universe. In the talk I will discuss the neutrino sector and phenomenology of this model. The model exhibits suppressed nonstandard neutrino interactions and potential to discover the disappearance of active neutrino flavours to sterile flavours via SHiP and MATHUSLA experiment. In addition, I will discuss the sub-leading corrections to neutrino masses arising from one-loop contribution to light neutrino self-energies.

    References: arXiv 2104.14571, 2105.13360.

Hopefully the up to 50 min + 10 min discussion long seminar/colloquium will be understandable to a wide audience.
Contacts: Keijo Kajantie (keijo kajantie at helsinki fi) [ HIP seminar],
Sami Raatikainen (sami raatikainen at helsinki fi) [cosmo seminar]

New Nordic series of seminars over the web, link: 
For more information, and to subscribe to email announcements, contact Oscar Henriksson (oscar henriksson at helsinki fi)

Other related seminars

Friday 10-12 seminar series in A315:Astrophysics seminar.
Mathematical Physics Seminar and Workshop series Wed 14-16 in Exactum C123.