Extended Massive Ambitwistor String
Abstract
This work considers a variation of the massive ambitwistor string model presented in arXiv:2301.11227 that describes supergravity and super-Yang-Mills on the Coulomb branch simultaneously with a single Lagrangian. All-multiplicity tree and one-loop amplitudes are evaluated and shown to have proper unitary factorization. The massless limit provides Einstein Yang-Mills Amplitudes including multiple gluon traces. It is argued that the cosmological constant vanishes at all orders of perturbation theory. As application, results for Compton scattering are obtained and compared with ones in the literature.
Cite
@article{arxiv.2406.01907,
title = {Extended Massive Ambitwistor String},
author = {Christian Kunz},
journal= {arXiv preprint arXiv:2406.01907},
year = {2026}
}
Comments
24 pages, v2 has corrections and references to a forthcoming paper, v3 adds a couple of clarifications and typo corrections and makes the forwarding reference explicit, in v4 loop amplitudes on odd spin structures no longer vanish because of different boundary conditions for the ghost fields