Self-consistent radiative backaction in dispersion interactions: a minimal mQED model

• URL: http://arxiv.org/abs/2605.02981v1
• Date: Mon, 04 May 2026 07:45:38 GMT
• Title: Self-consistent radiative backaction in dispersion interactions: a minimal mQED model
• Abstract summary: We study how self-consistent electromagnetic backaction modifies van der Waals excitation interactions.<n>Our analysis demonstrates that these effects originate from the coherent accumulation of repeated photon-mediated scattering processes.<n>The results highlight limitations of perturbative dispersion theories with fixed spectra and identify few-level systems as a clean platform for studying backaction in dispersion forces.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Dispersion interactions are usually derived assuming fixed internal spectra of the interacting quantum systems. Here, we relax this assumption and study how self-consistent electromagnetic backaction modifies van der Waals interactions when excitation energies and transition dipole moments are allowed to respond to the interaction itself. Within a macroscopic quantum electrodynamics framework, we formulate a self-consistent treatment that includes both self-energy corrections and mutual backaction. Using a minimal three-level model, we show that, while one-sided self-energy effects are short-ranged, fully self-consistent backaction can lead to substantial, long-ranged modifications of the effective van der Waals interaction. Our analysis demonstrates that these effects originate from the coherent accumulation of repeated photon-mediated scattering processes. The results highlight limitations of perturbative dispersion theories with fixed spectra and identify few-level systems as a clean platform for studying backaction in dispersion forces.

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