NATIONAL SEMINAR THEORETICAL HIGH ENERGY PHYSICS (March 2021)

Introtext goes here

  • Date:

    Friday, 12 March 2021

  • Speakers:

    Valerie Domcke (CERN) Nikhef colloquium
    Wash-in leptogenesis

    Jordy de Vries (UvA)
    Precision searches for Beyond-the-Standard-Model Physics

    Beatrice Bonga (Radboud University)
    Melting neutron stars

    Stefano Lanza (UU)
    The web of Swampland Conjectures: how quantum gravity constrains effective field theories

    Abstract

    Leptogenesis describes the dynamical generation of the matter antimatter asymmetry in our universe by invoking right-handed neutrinos. Here, I will present a leptogenesis mechanism based on the standard type-I seesaw model that, contrary to the standard lore, successfully operates with right-handed neutrinos which have relatively low masses, large couplings and negligible CP violation. The key idea behind wash-in leptogenesis is to generalize standard freeze-out leptogenesis to a nonminimal cosmological background in which the chemical potentials of all particles not in chemical equilibrium at the temperature of leptogenesis are allowed to take arbitrary values. This sets the stage for constructing new baryogenesis models where chemical potentials generated at high temperatures are reprocessed to generate a nonvanishing B-L asymmetry at low temperatures. As concrete examples, I discuss wash-in leptogenesis after axion inflation and in the context of grand unification.

  • Location:

    via Zoom (link is mentioned in the mail of 23 February)

    The next edition of the national seminar will be on Friday March 12.
    It will take place virtually and in a correspondingly slimmed-down format. Specifically, it consists of the Nikhef colloquium and 20 minute presentations in which new faculty/postdocs introduce themselves.

  • Schedule:

    The schedule is as follows:

    11:00 – 12:00 Nikhef colloquium – Valerie Domcke (CERN).

    Title: Wash-in leptogenesis

    Abstract: Leptogenesis describes the dynamical generation of the matter antimatter asymmetry in our universe by invoking right-handed neutrinos. Here, I will present a leptogenesis mechanism based on the standard type-I seesaw model that, contrary to the standard lore, successfully operates with right-handed neutrinos which have relatively low masses, large couplings and negligible CP violation. The key idea behind wash-in leptogenesis is to generalize standard freeze-out leptogenesis to a nonminimal cosmological background in which the chemical potentials of all particles not in chemical equilibrium at the temperature of leptogenesis are allowed to take arbitrary values. This sets the stage for constructing new baryogenesis models where chemical potentials generated at high temperatures are reprocessed to generate a nonvanishing B-L asymmetry at low temperatures. As concrete examples, I discuss wash-in leptogenesis after axion inflation and in the context of grand unification.

    14:00 – 14:20 Jordy de Vries (University of Amsterdam) – Precision searches for Beyond-the-Standard-Model Physics

    14:20 – 14:40 Beatrice Bonga (Radboud University) – Melting neutron stars

    14:40 – 15:00 Stefano Lanza (Utrecht University) – The web of Swampland Conjectures: how quantum gravity constrains effective field theories

  • Local organizers:

    For questions or suggestions, please contact one of the organizers:

    Wouter Waalewijn (NIKHEF)
    tel: +31 (0)20 5255773
    e-mail: wouterw@nikhef.nl

    Marieke Postma (Nikhef)
    tel.: +31 (0)20 5925128
    e-mail: mpostma@nikhef.nl

    Thomas Grimm (UU)
    tel.: +31 (0)30 2535917
    e-mail: t.w.grimm@uu.nl