• Evaluating the price of tiny kinetic mixing 

      Gherghetta, Tony; Kersten, Jörn; Olive, Keith A.; Pospelov, Maxim (Peer reviewed; Journal article, 2019)
      We consider both “bottom-up” and “top-down” approaches to the origin of gauge kinetic mixing. We focus on the possibilities for obtaining kinetic mixings ϵ which are consistent with experimental constraints and are much ...
    • Small-Scale Crisis in Cosmology – Sterile Neutrinos to the Rescue? 

      Kersten, Jörn (Peer reviewed; Journal article, 2019-04-24)
      The ΛCDM standard model of cosmology is in excellent agreement with data on large scales but has difficulty explaining all observations on small scales. I discuss a simple particle physics model involving a new MeV-scale ...