The moduli space of flat maximal space-like embeddings in pseudo-hyperbolic space

We study the moduli space of flat maximal space-like embeddings in ${\mathbb{H}}^{2,2}$ from various aspects. We first describe the associated Codazzi tensors to the embedding in the general setting, and then, we introduce a family of pseudo-Kähler metrics on the moduli space. We show the existence of two Hamiltonian actions with associated moment maps and use them to find a geometric global Darboux frame for any symplectic form in the above family.