Year: 2026
Type: preprint
Abstract: We study the self-energy $E_0(α,Λ)$ of the spinless Pauli-Fierz model with a sharp ultraviolet cutoff $Λ$, retaining the vacuum contribution of the $A^2$ term (no normal ordering); $α=e^2/4π$ is the fine structure constant. Lieb and Loss proved lower and upper bounds of orders $α^{1/2}Λ^{3/2}$ and $α^{2/7}Λ^{12/7}$ for large $Λ$ and suggested that the upper bound, which comes from product states, gives the correct order. We prove that, for every fixed $α>0$, $E_0(α,Λ)=(1+o(1))\,c_α\,α^{2/7}Λ^{12/7}$, with an explicit constant $c_α=0.99338\ldots$, as $Λ\to\infty$. The same asymptotics hold uniformly in the joint limit $Λ/α\to\infty$, $α^{5/2}Λ\to\infty$, provided $\log(2+α)=o((Λ/α)^{1/21})$. The infimum of the energy over product states has the same leading asymptotics. The upper bound follows from a coherent state bound for the field energy in a fixed electron density. For the lower bound we combine a periodization of the field, a blockwise Born-Oppenheimer bound, and a lower bound on the magnetic Neumann Laplacian on a cube for band-limited fields. The magnetic estimate follows from a non-concentration bound for the vorticity of band-limited fields satisfying a weighted gradient condition.
Source: arXiv (Cornell University)
Author: Futakuchi, Shinichiro
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7223872749