# CMSA Quantum Matter in Mathematics and Physics: Quantum Algebra of Chern-Simons Matrix Model and Large N Limit

SEMINARS, CMSA EVENTS

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February 14, 2024 4:00 pm - 5:30 pm

CMSA, 20 Garden St, G10

Address:
20 Garden Street, Cambridge, MA 02138

##### Speaker:

Sen Hu *- Shanghai Institute for Mathematics and Interdisciplinary Study*

In this talk we discuss the algebra of quantum observables of the Chern-Simons matrix model which was originally proposed by Susskind and Polychronakos to describe electrons in fractional quantum Hall effects. We establish the commutation relations for its generators and study the large N limit of its representation. We show that the large N limit algebra is isomorphic to the uniform in N algebra studied by Costello, which is conjecturally isomorphic to the deformed double current algebra studied by Guay. Under appropriate scaling limit, we show that the large N limit algebra degenerates to a Lie algebra which admits a surjective map to the affine Lie algebra of u(p). This leads to a complete proof of the large N emergence of the u(p) current algebra as proposed by Dorey, Tong and Turner. This also suggests a rigorous derivation of edge excitation of a fractional quantum Hall droplet. This is a joint work with Si Li, Dongheng Ye, and Yehao Zhou (arXiv: 2308.14046).

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