RTG seminar series winter 2024/2025 @ TP2

T a l k : 30. January 2025

MSc. Yu Chen
Title: Dark Matter and Radiative Neutrino Masses in Composite Higgs Models with a UV Completion

The mystery of dark matter and the small neutrino masses can be simultaneously addressed within the framework of the so-called scotogenic models. In these models, the observed left-handed neutrinos naturally acquire small Majorana masses at the one-loop level, while a dark matter candidates emerges due to an exact Z_2 symmetry. This project aims to explore scotogenic models in the composite Higgs scenarios, where the Higgs boson is a pseudo-Nambu-Goldstone boson arising from the spontaneous symmetry breaking G->H. The research objectives include the classification of possible minimal cosets that allow for the realization of composite scotogenic models, as well as their phenomenological implications in collider experiments and astrophysical observations.

MSc. Deepali Singh
Title: From gauge/gravity duality to Composite Higgs Models

The AdS/CFT correspondence describes the duality between an n-dimensional conformal field theory (CFT) and an n+1-dimensional gravity theory which is asymptotically anti de Sitter (AdS) or has a constant negative curvature at infinity. A very important feature of this duality lies in its weak/strong nature, meaning when the gauge theory is strongly coupled and perturbation theory fails, the gravitational side of the duality is described effectively by a classical theory and vice versa. This makes it useful for studying strongly coupled systems, such as those encountered in quantum chromodynamics (QCD) or theories of quantum gravity. In this talk, we will focus on applying this duality to the framework of Composite Higgs models which addresses the hierarchy problem in the Standard model by interpreting the Higgs boson as a pseudo-Nambu-Goldstone boson arising from a global symmetry breaking. We will see how AdS/CFT offers powerful tools to study these Composite Higgs scenarios owing to its weak/strong nature. Specifically, we will consider models in which the global group SU(4)xSU(4) gets broken to the diagonal SU(4). We will then use the duality to calculate the spectrum of bosonic bound states emerging in Composite Higgs models.