2023 Theses Doctoral

# Webs and Foams of Simple Lie Algebras

In the first part of the dissertation, we construct two-dimensional TQFTs which categorify the evaluations of circles in Kuperberg’s 𝐵₂ spider. We give a purely combinatorial evaluation formula for these TQFTs and show that it is compatible with the trace map on the corresponding commutative Frobenius algebras. Furthermore, we develop a theory of Θ-foams and their combinatorial evaluations to lift the ungraded evaluation of the Θ-web, thus paving a way for categorifying 𝐵₂ webs to 𝐵₂ foams.

In the second part of the dissertation, we study the calculus of unoriented 𝔰𝔩₃ webs and foams. We focus on webs with a small number of boundary points. We obtain reducible collections and consider bilinear forms on these collections given by pairings of webs. We give web categories stable under the action of certain endofunctors and derive relations between compositions of these endofunctors.

## Files

- Thatte_columbia_0054D_17956.pdf application/pdf 344 KB Download File

## More About This Work

- Academic Units
- Mathematics
- Thesis Advisors
- Khovanov, Mikhail G.
- Degree
- Ph.D., Columbia University
- Published Here
- July 5, 2023