Supersymmetric Lorentz invariant deformations of superspaces

Abstract

Lorentz invariant supersymmetric deformations of superspaces based on Moyal star product parametrized by Majorana spinor $λ_{a}$ and Ramond grassmannian vector $ψ_{m}=-{1\over 2}(\barθγ_{m}λ)$ in the spinor realization \cite{VZ} are proposed. The map of supergravity background into composite supercoordinates: $(B^{-1}_{mn}, Ψ^{a}_{m}, C_{ab}) \leftrightarrow (iψ_{m}ψ_{n}, ψ_{m}λ^{a}, λ_{a}λ_{b})$ valid up to the second order corrections in deformation parameter $h$ and transforming the background dependent Lorentz noninvariant (anti)commutators of supercoordinates into their invariant Moyal brackets is revealed. We found one of the deformations to depend on the axial vector $ψ_{1m}={1/2}(\barθγ_{m}γ_{5}λ)$ and to vanish for the $θ$ components with the same chiralities. The deformations in the (super)twistor picture are discussed.