title: Towards the all-loop worldsheet S matrix for AdS₃×S³×T⁴.
abstract: We obtain the all-loop worldsheet S matrix for fundamental excitations on AdS₃×S³×T⁴ by studying the off-shell symmetry algebra of the superspace action in light cone gauge. The massless modes, unaccounted for in earlier works, are automatically included in our treatment. Their exact dispersion relation is found to be nonrelativistic, of giant-magnon form, and their scattering is naturally well defined. This opens the way to a complete investigation of AdS₃/CFT₂ integrability.
authors.affiliation: Institute for Theoretical Physics and Spinoza Institute, Utrecht University, 3508 TD Utrecht, Netherlands.
authors.forename: Riccardo
authors.initials: R
authors.lastname: Borsato
authors.affiliation: The Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom.
authors.forename: Olof
authors.initials: O
authors.lastname: Ohlsson Sax
authors.affiliation: Institute for Theoretical Physics and Spinoza Institute, Utrecht University, 3508 TD Utrecht, Netherlands and Institut für Mathematik and Institut für Physik, Humboldt-Universität zu Berlin, Zum Großen Windkanal 6, 12489 Berlin, Germany.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Sfondrini
authors.affiliation: Centre for Mathematical Science, City University London, Northampton Square, London EC1V 0HB, United Kingdom.
authors.forename: Bogdan
authors.initials: B
authors.lastname: Stefański