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DTSTART;TZID=America/New_York:20220210T093000
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SUMMARY:The global structure of the Standard Model and new nonperturbative processes
DESCRIPTION:Speaker: Mohamed Anber (Durham University) \nTitle: The global structure of the Standard Model and new nonperturbative processes \nAbstract: It is well-established that the Standard Model (SM) of particle physics is based on su(3)Xsu(2)Xu(1) Lie-algebra. What is less appreciated\, however\, is that SM accommodates a Z_6 1-form global symmetry.  Gauging this symmetry\, or a subgroup of it\, changes the global structure of the SM gauge group and amounts to summing over sectors of instantons with fractional topological charges. After a brief review of the concept of higher-form symmetries\, I will explain the origin of the Z_6 1-form symmetry and construct the explicit fractional-instanton solutions on compact manifolds. The new instantons mediate baryon-number and lepton-number violating processes\, which can win over the weak BPST-instanton processes\, provided that SM accommodates extra hyper-charged particles above the TeV scale. I will also comment on the cosmological aspects of the new solutions.
URL:https://cmsa.fas.harvard.edu/event/2-10-2022-quantum-matter-in-mathematics-and-physics/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/jpeg:https://cmsa.fas.harvard.edu/media/CMSA-QMMP-02.10.2022-1544x2048-1.jpg
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