The intrinsic Lagrangian fibration on the cotangent bundle of an intersection of two quadrics coincides with the Hitchin morphism of the moduli space of twisted Spin bundles over the associated hyperelliptic curve.
Linear subspaces of the intersection of two quadrics via Kuznetsov component
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abstract
Let $Q_i(i=1,2)$ be $2g$ dimensional quadrics in $\mathbb{P}^{2g+1}$ and let $Y$ be the smooth intersection $Q_1\cap Q_2$. We associate the linear subspace in $Y$ with vector bundles on the hyperelliptic curve $C$ of genus $g$ by the left adjoint functor of $\Phi:D^b(C)\rightarrow D^b(Y)$. As an application, we give a different proof of the classification of line bundles and stable bundles of rank $2$ on hyperelliptic curves given by Desale and Ramanan. When $g=3$, we show that the projection functor induces a closed embedding $\alpha:Y\rightarrow SU^s_C(4,h)$ into the moduli space of stable bundles on $C$ of rank $4$ of fixed determinant.
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Intersection of two quadrics: modular interpretation and Hitchin morphism
The intrinsic Lagrangian fibration on the cotangent bundle of an intersection of two quadrics coincides with the Hitchin morphism of the moduli space of twisted Spin bundles over the associated hyperelliptic curve.