Speaker
Michael Shamma
(Korea Institute for Advanced Study)
Description
We study the low-energy behavior of gauge couplings in the presence of dynamical scalar backgrounds. In weakly coupled, renormalizable four-dimensional theories, gauge invariance restricts the dependence on the scalar background to be logarithmic. The gauge coupling evolution in these scenarios can be entirely described by the renormalization-group running with dynamical mass thresholds. Beyond one loop, other couplings can enter the gauge beta function, providing a different mechanism for variations. We discuss phenomenological implications for the dynamical evolution of the Standard Model gauge couplings.
Author
Michael Shamma
(Korea Institute for Advanced Study)