Chowdhury, Subham Dutta; Gadde, Abhijit; GOPALKA, TUSHAR; Halder, Indranil; Janagal, Lavneet; Minwalla, Shiraz
(Springer Nature, 2020-02)
We study the space of all kinematically allowed four photon and four graviton S-matrices, polynomial in scattering momenta. We demonstrate that this space is the permutation invariant sector of a module over the ring of ...