On zero modes of the eleven dimensional superstring

TL;DR

This paper demonstrates that the on-shell degrees of freedom of the D=11 superstring do not affect its quantum spectrum, which matches that of the D=10 type IIA superstring, clarifying the role of zero modes.

Contribution

It shows that the recently identified on-shell degrees of freedom in D=11 superstring do not contribute to the quantum spectrum, aligning it with the D=10 type IIA superstring spectrum.

Findings

On-shell degrees of freedom do not contribute to the spectrum.

D=11 superstring spectrum matches D=10 type IIA spectrum.

Zero modes do not alter the quantum states.

Abstract

It is shown that recently pointed out by Berkovits on-shell degrees of freedom of the D=11 superstring do not make contributions into the quantum states spectrum of the theory. As a consequence, the spectrum coincides with that of the D=10 type IIA superstring.