Strings on Plane Waves, Super-Yang Mills in Four Dimensions, Quantum Groups at Roots of One

TL;DR

This paper reveals a quantum group structure underlying BMN operators in N=4 super Yang Mills theory, connecting algebraic deformations to string theory oscillators in a plane wave background.

Contribution

It introduces a quantum deformation of the SO(6) symmetry to construct BMN operators, providing a new algebraic framework for understanding their properties.

Findings

Quantum group construction of BMN operators using q-deformed U(2) subalgebra.

Generation of oscillators with correct permutation symmetries via quantum co-product.

Implication that correlators have a geometric interpretation in quantum group symmetric spaces.

Abstract

We show that the BMN operators in D=4 N=4 super Yang Mills theory proposed as duals of stringy oscillators in a plane wave background have a natural quantum group construction in terms of the quantum deformation of the SO(6) $R$ symmetry. We describe in detail how a q-deformed U(2) subalgebra generates BMN operators, with $ q \sim e^{2 i \pi \over J}$. The standard quantum co-product as well as generalized traces which use $q$-cyclic operators acting on tensor products of Higgs fields are the ingredients in this construction. They generate the oscillators with the correct (undeformed) permutation symmetries of Fock space oscillators. The quantum group can be viewed as a spectrum generating algebra, and suggests that correlators of BMN operators should have a geometrical meaning in terms of spaces with quantum group symmetry.