Low Tension Strings on a Cosmological Singularity

Understand

It has recently been argued that the singularity of the Milne orbifold can be resolved in higher spin theories.

• In string theory scattering amplitudes, however, the Milne singularity gives rise to ultraviolet divergences that signal uncontrolled backreaction.
• Since string theory in the low tension limit is expected to be a higher spin theory (although precise proposals only exist in special cases), we investigate what happens to these scattering amplitudes in the low tension limit.
• We point out that the known problematic ultraviolet divergences disappear in this limit.