Null Strings Gauged, Reloaded and Quantized, II: Null Strings on Flat Backgorund Have Discrete Spectrum
We continue our study of the quantization of null strings, strings with Carrollian worldsheets described by an action with two-dimensional (2d) diffeomorphisms, Weyl and Carroll-Weyl scaling as gauge symmetry. We perform light cone gauge quantization of the null strings on flat space background within Schrödinger representation, initiated in arXiv:2607.02970. We show, within the regular separated Schrödinger sector, that bosonic null strings on a flat background have no critical dimensions, have discrete, nonnegative mass-squared levels and are hence free of tachyonic modes.
hep-th↗