# Anomaly and Cobordism Constraints Beyond Grand Unification: Energy Hierarchy

@article{Wang2020AnomalyAC, title={Anomaly and Cobordism Constraints Beyond Grand Unification: Energy Hierarchy}, author={Juven C. Wang}, journal={arXiv: High Energy Physics - Theory}, year={2020} }

A recent work [2006.16996] suggests that a 4d nonperturbative global anomaly of mod 16 class hinting a possible new hidden gapped topological sector beyond the Standard Model (SM) and Georgi-Glashow $su(5)$ Grand Unified Theory (GUT) with 15n chiral Weyl fermions and a discrete $\mathbb{Z}_{4,X}$ symmetry of $X=5({\bf B- L})-4Y$. This $\mathbb{Z}_{16}$ class global anomaly is a mixed gauge-gravitational anomaly between the discrete $X$ and spacetime backgrounds. The new topological sector has a…

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