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We study the null orbifold singularity in 2+1 d flat space higher spin theoryas well as string theory. Using the Chern-Simons formulation of 2+1 d Einsteingravity, we first observe that despite the singular nature of this geometry,the eigenvalues of its Chern-Simons holonomy are trivial. Next, we construct aresolution of the singularity in higher spin theory: a Kundt spacetime withvanishing scalar curvature invariants. We also point out that the UVdivergences previously observed in the 2-to-2 tachyon tree level stringamplitude on the null orbifold do not arise in the $\alpha^\prime\to \infty$limit. We find all the divergences of the amplitude and demonstrate that theones remaining in the tensionless limit are physical IR-type divergences. Weconclude with a discussion on the meaning and limitations of higher spin(cosmological) singularity resolution and its potential connection to stringtheory.

Strings vs Spins on the Null Orbifold