Secondary staircase complexes on isotropic Grassmannians

We introduce a class of equivariant vector bundles on isotropic symplectic Grassmannians $\mathrm{I}\mathrm{G}\mathrm{r}(k,2n)$ defined as appropriate truncations of staircase complexes and show that these bundles can be assembled into a number of complexes quasi-isomorphic to the symplectic wedge powers of the symplectic bundle on $\mathrm{I}\mathrm{G}\mathrm{r}(k,2n)$. We are planning to use these secondary staircase complexes to study fullness of exceptional collections in the derived categories of isotropic Grassmannians and Lefschetz exceptional collections on $\mathrm{I}\mathrm{G}\mathrm{r}(3,2n)$.