Fermion doubling and Berenstein–Maldacena–Nastase correspondence

We show that the string bit model suffers from doubling in the fermionic sector. The doubling leads to strong violation of supersymmetry in the limit N→∞. Since there is an exact correspondence between string bits and the algebra of BMN operators even at finite N, doubling is expected also on the side of super-Yang–Mills theory. We discuss the origin of the doubling in the BMN sector.