Research Project:

The tensionless limit of string theory probes the ultra-high energy behaviour of string theory where one expects to find higher symmetry structures. One can apply the techniques of Galilean conformal field theories to the case of tensionless strings in the same manner as conformal symmetry is used to study tensile strings. During my stay at ESI I would study the scattering amplitudes of tensionless strings and link it with the Cachazo-He-Yuan formalism for ambitwistor strings, where the same symmetry structure has been observed. Analogous to the tensile case, I would study the fate of the one-loop beta functions in the tensionless limit by demanding Galilean conformal invariance. These conditions would dictate the type of spacetimes the tensionless string can move in. Due to the singular structure of the tensionless worldsheet, it is expected to see Newton-Cartan structures arise in the target spacetime. I would also like to study how strings behave near blackholes. The singular nature of spacetime will influence the tensile string and make it extremely long, which is aptly described by tensionless strings. It would provide an important piece of the jigsaw puzzle in order to fully understand the connection between tensionless strings and how it influences the spacetime.