All-order quartic couplings in highly symmetric D-brane-anti-D-brane systems

A bstract We compute six-point string amplitudes for the scattering of one closed Ramond-Ramond state, two tachyons and gauge fields in worldvolume D-brane-anti-D-brane systems Type II superstring theories. From resulting S-matrix elements, we read off precise form couplings, including their exact numerical coefficients, corresponding highly symmetric effective field eheory (EFT) Lagrangian D-brane-Anti-D-brane to all orders α′ , which modify complete previous proposals. verify that EFT reproduces infinite collection stringy singularities dual channels. Inspired by interesting similarities between all-order EFTs holographic duals Vasiliev’s higher spin gravities à là Nilsson Vasiliev, make a proposal tensionless limits systems.