On Fermionic T-duality of Sigma modes on AdS backgrounds

We study the fermionic T-duality symmetry of integrable Green-Schwarz sigma models on AdS backgrounds. We show that the sigma model on AdS5 × S1 background is self-dual under fermionic T-duality. We also construct new integrable sigma models on AdS2 ×CPn. These backgrounds could be realized as supercosets of SU supergroups for arbitrary n, but could also be realized as supercosets of OSp supergroups for n = 1, 3. We find that the supercosets based on SU supergroups are self-dual under fermionic T-duality, while the supercosets based on OSp supergroups are not. However, the reasons of OSp supercosets being not self-dual under fermionic T-duality are different. For OSp(6|2) case, corresponding to AdS2 ×CP 3 background, the failure is due to the singular fermionic quadratic terms, just like AdS4×CP 3 case. For OSp(3|2) case, the failure is due to the shortage of right number of κ-symmetry to gauge away the fermionic degrees of freedom, even though the fermionic quadratic term is not singular any more. More general, for the supercosets of the OSp supergroups with superalgebra B(n,m), including AdS2 × S2n and AdS4 × S2n backgrounds, the sigma models are not self-dual under fermionic T-duality as well, obstructed by the κ-symmetry.