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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.05715 |
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Table of Contents:
- We study quadratic moduli schemes $X$ of algebra laws on a fixed vector space $W$ under the transport-of-structure action of $GL(W)$ on $Hom(W^{\otimes 2},W)$. We construct an intrinsic three-term deformation complex on $X$ whose fibers encode transverse first-order classes and primary obstructions, and whose cohomology agrees on the operadic loci with the standard low-degree deformation cohomology (à la Gerstenhaber and Nijenhuis--Richardson). We then define a canonical quadratic map $κ^{inc}_{2,μ}\colon H^2_{inc}(μ)\to H^3_{inc}(μ)$ that controls second-order lifts modulo isotriviality. If $μ$ is smooth point in a reduced component and $(κ^{inc}_{2,μ})^{-1}(0)=\{0\}$, then the $G$-orbit of $μ$ is Zariski open in that component. This provides a coordinate-free explanation of Richardson-type geometric rigidity even when the second deformation cohomology does not vanish.