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Seminar

Graduate Student Seminar: q-de Rham cohomology and Habiro rings September 24, 2026 (10:00 AM PDT - 11:00 AM PDT)
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Location: SLMath: Eisenbud Auditorium, Online/Virtual
Speaker(s) Tudor-Ioan Caba (University of Edinburgh)
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Starting from knots and their colored Jones polynomials, we explain how surgery on framed links leads to Witten–Reshetikhin–Turaev invariants of 3-manifolds. For integral homology 3-spheres, Habiro assembles the invariants at roots of unity into a single element of the Habiro ring. We introduce this cyclotomic completion and its basic properties, explaining how evaluation at roots of unity and Taylor expansion connect quantum invariants with arithmetic.

Suggested references

Habiro, Cyclotomic completions of polynomial rings.

Habiro, A unified Witten–Reshetikhin–Turaev invariant for integral homology spheres.

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