On an alternative quantization of R-NS strings

TL;DR

This paper explores a novel quantization method for R-NS string theory that results in a finite spectrum matching massless sectors of type IIA/IIB superstrings, free of tachyons.

Contribution

It introduces an alternative quantization scheme with a different vacuum structure, leading to a tachyon-free, finite-degree-of-freedom string theory matching superstring massless spectra.

Findings

Finite number of propagating degrees of freedom.

Tachyon-free spectrum with appropriate GSO projection.

Spectrum matches massless sectors of type IIA/IIB superstrings.

Abstract

We investigate an alternative quantization of R-NS string theory. In the alternative quantization, we define the distinct vacuum for the left-moving mode and the right-moving mode by exchanging the role of creation operators and annihilation operators in the left-moving sector. The resulting string theory has only a finite number of propagating degrees of freedom. We show that an appropriate choice of the GSO projection makes the theory tachyon free. The spectrum coincides with the massless sector of type IIA or type IIB superstring theory without any massive excitations.