Weyl-Type Algebras over Exponential-Polynomial Rings: Structure, Representations, and Deformations

This paper introduces and studies a class of Weyl-type algebras $A_{p,t,\cA} = \Weyl{e^{\pm x^{p} e^{t x}},\; e^{\cA x},\; x^{\cA}}$ constructed over exponential-polynomial rings, where $\FF$ is a field of characteristic zero, $\cA$ is a finitely generated additive subgroup of $\FF$, and $p \in \mathbb{N}^n$, $t \in \FF$. We investigate their structural properties, proving simplicity, establishing faithful infinite-dimensional irreducible representations, and demonstrating the failure of the Noetherian property. A natural filtration by exponential order is introduced, with the associated graded algebra shown to be commutative. We also examine the corresponding Witt-type Lie algebra $\mathfrak{g}_{p,t,\cA} = \Der_{\mathrm{gr}}(R_{p,t,\cA})$ and prove the vanishing of its second cohomology group with adjoint coefficients, implying rigidity under formal deformations. Furthermore, we construct explicit deformation quantizations of the underlying exponential-polynomial rings, compute Hochschild and cyclic homology groups, and relate them to the topology of the parameter space. The deformation rigidity of $A_{p,t,\cA}$ is classified in terms of the rank of $\cA$, and a Gerstenhaber algebra structure on the Hochschild cohomology is described. Several open problems concerning representation classification and geometric realization are proposed.