Scattering of Null strings - Flipped Vacuum & CHY
Abstract
We investigate the scattering of null tensionless strings. Classical null strings, given by the ILST action, give rise to three distinct quantum theories built on different vacua and representations of the underlying 2d Conformal Carroll algebra (CCA) which form the residual gauge symmetries on the null worldsheet. In this paper, we are interested in the quantum theory built out of the so-called "flipped" vacuum which realises the highest weight representation of the 2d CCA. By considering a novel class of vertex operators, intimately connected to the compactified null string, we build scattering amplitudes of the theory. We show that one naturally obtains the Cachazo-He-Yuan (CHY) formulae when one considers scattering of massless states in the null ``flipped'' string.
Related
- Double Copy from the Flipped Null String
- Null String Holography, Null Strings Probe Projective Boundary of Their Target Spaces
- Reflected constraint algebras of open Carroll--Weyl null strings
- (Anti-)De Sitter null strings and Carroll-Weyl symmetry
- Path integral quantization of null bosonic strings with Carroll-Weyl ghosts
BibTeX
@misc{bagchi2026scattering,
title = {{Scattering of Null strings - Flipped Vacuum & CHY}},
author = {Arjun Bagchi and Sachin Grover and Sharang Rajesh Iyer and Amartya Saha and Stephan Stieberger},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.07845},
eprint = {2609.07845},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.07845},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Scattering of Null strings - Flipped Vacuum & CHY
AU - Arjun Bagchi
AU - Sachin Grover
AU - Sharang Rajesh Iyer
AU - Amartya Saha
AU - Stephan Stieberger
PY - 2026
DA - 2026/10/05
PB - arXiv
DO - 10.48550/arxiv.2609.07845
UR - https://arxiv.org/abs/2609.07845
AB - We investigate the scattering of null tensionless strings. Classical null strings, given by the ILST action, give rise to three distinct quantum theories built on different vacua and representations of the underlying 2d Conformal Carroll algebra (CCA) which form the residual gauge symmetries on the null worldsheet. In this paper, we are interested in the quantum theory built out of the so-called "flipped" vacuum which realises the highest weight representation of the 2d CCA. By considering a novel class of vertex operators, intimately connected to the compactified null string, we build scattering amplitudes of the theory. We show that one naturally obtains the Cachazo-He-Yuan (CHY) formulae when one considers scattering of massless states in the null ``flipped'' string.
ER -