Cut-off Jastrow Factors and Spectral Barron Regularity of Coulombic Electronic Wave Functions

Abstract

We study the spectral Barron regularity of Coulombic electronic eigenfunctions after extraction of a cut-off Jastrow factor. Let \(H=-Δ+V\) be an \(N\)-electron Coulomb Hamiltonian with clamped nuclei, and let \(ψ\) be an eigenfunction associated with a discrete eigenvalue below the bottom of the essential spectrum. For the cut-off Jastrow factor \(F_{\rm cut}\) of Fournais--Hoffmann-Ostenhof--Hoffmann-Ostenhof--Sørensen, we set \[ ϕ=e^{-F_{\rm cut}}ψ. \] Whereas the original wave function satisfies the sharp global threshold \(ψ\in \mathcal B_{\rm sp}^s(\mathbb R^{3N})\) for every \(0\leq s<1\), we prove that the Jastrow quotient gains one full order: \[ ϕ\in \mathcal B_{\rm sp}^s(\mathbb R^{3N}) \qquad \text{for every } 0\le s<2 . \] The endpoint \(s=2\) is shown to be natural through an explicit hydrogen-like eigenfunction. The many-body proof is a global Fourier-side resolvent argument. After conjugation by the cut-off Jastrow factor, the Coulomb singularities are converted into localized angular coefficient blocks with admissible Fourier-control measures. Low frequencies are controlled by the a priori \(H^1\)-bound, while high frequencies are recovered by a Neumann fixed-point argument using the resolvent multiplier and annular estimates for the coefficient measures.