BMN operators and string field theory

Romuald A. Janik

doi:10.1016/S0370-2693(02)02908-8

paper

BMN operators and string field theory

arXiv:hep-th/0209263 · doi:10.1016/S0370-2693(02)02908-8

Abstract

We extract from gauge theoretical calculations the matrix elements of the SYM dilatation operator. By the BMN correspondence this should coincide with the 3-string vertex of light cone string field theory in the pp-wave background. We find a mild but important discrepancy with the SFT results. If the modified $O (g_{2})$ matrix elements are used, the $O (g_{2}^{2})$ anomalous dimensions are exactly reproduced without the need for a contact interaction in the single string sector.

11 pages; v2: references added