One-particle operator representation over two-particle basis sets for relativistic QED computations
Abstract
This work is concerned with two-spin-1/2-fermion relativistic quantum mechanics, and it is about the construction of one-particle projectors using an inherently two(many)-particle, `explicitly correlated' basis representation, necessary for good numerical convergence of the interaction energy. It is demonstrated that a faithful representation of the one-particle operators, which appear in intermediate but essential computational steps, can be constructed over a many-particle basis set by accounting for the full Hilbert space beyond the physically relevant anti-symmetric subspace. Applications of this development can be foreseen for the computation of quantum-electrodynamics corrections for a correlated relativistic reference state and high-precision relativistic computations of medium-to-high- helium-like systems, for which other two-particle projection techniques are unreliable.
Cite
@article{arxiv.2406.07086,
title = {One-particle operator representation over two-particle basis sets for relativistic QED computations},
author = {Péter Hollósy and Péter Jeszenszki and Edit Mátyus},
journal= {arXiv preprint arXiv:2406.07086},
year = {2024}
}