Twisted forms of differential Lie algebras over $\mathbb{C}(t)$ associated with complex simple Lie algebras

Abstract

Discussed here is descent theory in the differential context where everything is equipped with a differential operator. To answer a question personally posed by A. Pianzola, we determine all twisted forms of the differential Lie algebras over $\mathbb{C}(t)$ associated with complex simple Lie algebras. Hopf-Galois Theory, a ring-theoretic counterpart of theory of torsors for group schemes, plays a role when we grasp the above-mentioned twisted forms from torsors.

Largely revised; in particular, changed the title and added several articles to the References, see the added Remark 2.2