${\hat{I}}^2$ symmetry in type II Supergravities

Abstract

A non geometric sector of the duality group emerging in Kaluza-Klein reductions is realized as an effective symmetry in the low energy action of uncompactified type II theories. This is achieved by extending the so called ${\hat{I}}^2$ symmetry of the universal NS-NS sector to the R-R sector of type IIA, IIB and massive type IIA.

20 pages. v2: published in JHEP. v3: fixed typos in equations (4.33)-(4.34)