Renormalization flow fixed points for higher-dimensional abelian gauge fields

Abstract: A connection modulo gauge symmetry on the trivial principal bundle $M\times G$ is a morphism from the loop group of $M$ into $G$. Thus, considering only loops around the 2-cells of a distinguished family of progressively refined cellular structures on $M$, the observable algebra $A$ of an abelian gauge field can be presented as an inductive limit of quotients of polynomial algebras. In that context, it turns out that the state $\mu_\lambda:A\rightarrow\mathbb{C}$ of the Yang-Mills field on the sphere can be written $\mu_\lambda = \mu_0\mathrm{e}^{\lambda L}$ with $\lambda$ an interaction strength parameter, $L:A\rightarrow A$ an explicit second-order partial differential operator and $\mu_0$ the state of an almost surely flat connection. Extrapolating, we provide analogous states for the case of abelian gauge fields on $\mathbb{R}^d$.