Lie algebroid Connections, Moduli of $\mathcal{L}$--twisted Principal Objects and motives

Abstract

Let \(X\) be an irreducible smooth complex projective variety, and let \(G\) be a connected reductive linear algebraic group over \(\mathbb{C}\). In this paper, we first classify integrable transitive algebraic Lie algebroids on $X$. We then introduce Higgs bundles associated to a Lie algebroid and study their moduli spaces. In particular, we show that the category of vector bundles equipped with integrable \(\mathcal{L}\)-connections and the category of \(\mathcal{L}\)-twisted Higgs bundles of semiharmonic type on \(X\) are neutral Tannakian categories, provided that \(\mathcal{L}\) is a transitive Lie algebroid. Using this Tannakian framework, we obtain a characterization of principal \(G\)-bundles with integrable \(\mathcal{L}\)-connections and \(\mathcal{L}\)-twisted principal \(G\)-Higgs bundles of semiharmonic type on \(X\), and construct their moduli spaces via Mumford's geometric invariant theory. We further introduce the notion of the \(\mathcal{L}\)-Hodge moduli space for principal \(G\)-bundles and prove that the moduli spaces of principal \(G\)-bundles with integrable \(\mathcal{L}\)-connections, \(\mathcal{L}\)-twisted principal \(G\)-Higgs bundles of harmonic type, and the associated \(\mathcal{L}\)-Hodge moduli spaces are semiprojective varieties. Finally, using the semiprojectivity of the \(\mathcal{L}\)-Hodge moduli spaces for principal \(G\)-bundles, we obtain a description of smooth locus of these moduli spaces in the Grothendieck ring of varieties and establish a motivic non-abelian Hodge correspondence type theorem.