The Geometric Deformation of Curved L_∞ Algebras and Lie Algebroids

While L_∞ algebras are fundamental structures in differential geometry and mathematical physics, the geometric information encoded in such structures is often implicit. We address the following question: What constitutes a geometrically meaningful deformation of an L_∞ algebra arising from vector bundles, and how can such deformations classify new geometric invariants? Inspired by nonabelian extension theory of Lie algebras, we define geometric deformations of curved L_∞ algebras constructed from a vector bundle V→ M, and demonstrate that such deformations uniquely correspond to Lie algebroid structures on V. Explicit computations reveal that a representative of the first Atiyah-Chern class is exact in the total Weil complex, with its primitive representing the modular class in Lie algebroid cohomology. In the case of action Lie algebroids, the leading-order Atiyah-Chern classes correspond to the equivariant Chern characters. Applications to BV theories show that the geometric deformations naturally generate Poisson sigma models. These results provide a coherent framework for deriving field theories from geometric deformations of L_∞ algebras.