Seminarium "Teoria cząstek elementarnych i kosmologia"

There is growing theoretical evidence for the existence of an interactive UV fixed point in the renormalization group flow of the dimensionless couplings of the gravitational effective action. In the Standard Model and/or in models of New Physics embedded in the framework of trans-Planckian asymptotic safety, the presence of such a fixed point imposes Planck-scale boundary conditions on the gauge, Yukawa and scalar couplings. The ensuing fixed-point analysis often allows one to derive specific predictions for the IR phenomenology. Interestingly, it can also lead to the dynamical generation of arbitrarily small quantities, like for example the Yukawa couplings of Dirac neutrinos.In my talk I will briefly review the methods of the Functional Renormalization Group and the arguments which support the existence of a trans-Planckian fixed point of the gravitational action. I will then demonstrate how minuscule Yukawa couplings can be dynamically generated in this framework, both in the Standard Model with right-handed neutrinos and in its simple extension, the gauged B-L model. Finally, I will discuss possible phenomenological signatures of this scenario, in particular in the detection of gravitational waves from first-order phase transitions.

slides: https://mycloud.fuw.edu.pl/index.php/s/R27HNxRSzqkB8yN