Time, Place:

11:15 ,Seminar room Lindner 339, Gentner lab, 2nd floor

Speaker:

Dr. Junichiro Kawamura (Institute for Basic Science, Daejeon, South Korea)

Title:

Pseudo NG bosons from finite modular symmetry and radiative stabilization

In this talk, I argue that the modulus field of the finite modular symmetry can be stabilizedby the Coleman-Weinberg (CW) potential due to a modulus coupling to a heavy mass term,such as the vector-like quark masses in the KSVZ axion modeland Majorana mass of the type-I seesaw mechanism for the light neutrinos.As a result of this stabilization, the modulus is stabilized at a pointwhere the residual ZN symmetry is approximately unbroken.Interestingly, this ZN symmetry has an accidental U(1) symmetry,and thus the axionic component of the modulus becomes a pseudo NG boson. I will show two simple scenarios which are mostly the KSVZ axion and type-I seesaw models.For the former, I will discuss its consequence to the strong CP problem,and the majoron contributions to dark matter and radiation in the latter scenario.The study for the axion model can be found in arXiv:2402.02071.

Time, Place:

10:00 ,Grosser Hörsaal, Bibliotheksgebäude / Otto-Hahn-lecture hall, library building

Speaker:

Betriebsrat / Works council

Time, Place:

09:30 ,Central Seminar Room, library building

Speaker:

Silva Mezinska; Ultra-cold dynamics and collisions

Title:

Two-color ionization of lithium