String Theory seminar - Oliver Schlotterer Seminar

Tree-level amplitudes of type-I superstrings have been dramatically simplified by presenting them as double copies of field-theory amplitudes and scalar integrals over disk worldsheets. By the Kawai—Lewellen—Tye relations, such field-theory structures immediately propagate from open strings to closed-string amplitudes. In this talk, the double-copy construction will be extended to the tree-level amplitudes of bosonic and heterotic string theories. As a double-copy component of the open bosonic string, we identify a field theory involving dimension-six operators such as D^2 F^2 which has previously appeared in the double-copy construction of conformal supergravity.