A space of polynomials V of dimension 7 is called self-dual if the divided Wronskian of any 6-subspace is in V. A self-dual space V has a natural inner product. The divided Wronskian of any isotropic 3-subspace of V is a square of a polynomial. We call V self-self-dual if the square root of the divided Wronskian of any isotropic 3-subspace is again in V. We show that the self-self-dual spaces have a natural non-degenerate skew-symmetric 3-form defined in terms of Wronskians. We show that the self-self-dual spaces correspond to G2-populations related to the Bethe Ansatz of the Gaudin model of type G2 and prove that a G2-population is isomorphic to the G2 flag variety.
All Science Journal Classification (ASJC) codes
- Bethe ansatz
- Flag variety
- Gaudin model
- Spin representation