Quantum Gravity Unit Guest Seminar
Speaker: Ritankar Chatterjee (Indian Institute of Technology, Kanpur)
Title: "Tensionless Strings in a Kalb-Ramond Background"

Abstract:
We investigate tensionless (or null) bosonic string theory with a constant Kalb-Ramond background turned on. In analogy with the tensile case, we find that the constant Kalb-Ramond field has a non-trivial effect on the spectrum only when the theory is compactified on an S^1 ⊗d background with d ≥ 2. We discuss the effect of this constant background field on the tensionless spectrum constructed on three known consistent null string vacua. We elucidate further on the intriguing fate of duality symmetries in these classes of string theories when the background field is turned on.

Based on: https://arxiv.org/abs/2404.01385