On the gauge-invariant dynamical charges and densities of the 1-instanton solution

We study the gauge-invariant dynamically conserved charges, and their corresponding densities, for instanton solutions of Yang-Mills theories in four dimensional Euclidean space, for the gauge group SU (2). Those charges were constructed in 1, 2 through the integral equations of Yang-Mills theory, using techniques on generalized loop spaces. We use the integral non-Abelian Gauss law to evaluate the gauge-invariant flux of the magnetic and electric non-Abelian fields through spherical surfaces centered at the origin of the instanton solution. From such a flux, we define gauge-invariant charge densities by considering the charge within an infinitesimal spherical shell of radius rᵢ \, xⁱ/λ, with λ being the parameter of the instanton solution, defining its size, and xᵢ \, xⁱ = (x¹) ² + (x^2) ² + (x^3) ². We discuss the issue of the reparameterization invariance of the charges and densities, and show that the magnetic and electric fluxes for the instanton and anti-instanton, at r=1 and x⁴ = 0, x⁴ being the Euclidean time, are non-zero and observable. Our results give an interesting picture of the internal structure of the instanton, and may be important for the properties of the Yang-Mills θ-vacuum. 43 pages, 6 figures, Version published in Open Communications in Nonlinear Mathematical Physics, Special Issue Hietarinta 2026, ocnmp: 18516, pp 141-183