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Review

Dispersion Interactions between Neutral Atoms and the Quantum Electrodynamical Vacuum

1
Dipartimento di Fisica e Chimica, Università Degli Studi di Palermo, via Archirafi 36, I-90123 Palermo, Italy
2
INFN, Laboratori Nazionali del Sud, I-95123 Catania, Italy
Received: 30 October 2018 / Revised: 27 November 2018 / Accepted: 28 November 2018 / Published: 10 December 2018
(This article belongs to the Special Issue New Trends in Quantum Electrodynamics)
Dispersion interactions are long-range interactions between neutral ground-state atoms or molecules, or polarizable bodies in general, due to their common interaction with the quantum electromagnetic field. They arise from the exchange of virtual photons between the atoms, and, in the case of three or more atoms, are not additive. In this review, after having introduced the relevant coupling schemes and effective Hamiltonians, as well as properties of the vacuum fluctuations, we outline the main properties of dispersion interactions, both in the nonretarded (van der Waals) and retarded (Casimir–Polder) regime. We then discuss their deep relation with the existence of the vacuum fluctuations of the electromagnetic field and vacuum energy. We describe some transparent physical models of two- and three-body dispersion interactions, based on dressed vacuum field energy densities and spatial field correlations, which stress their deep connection with vacuum fluctuations and vacuum energy. These models give a clear insight of the physical origin of dispersion interactions, and also provide useful computational tools for their evaluation. We show that this aspect is particularly relevant in more complicated situations, for example when macroscopic boundaries are present. We also review recent results on dispersion interactions for atoms moving with noninertial motions and the strict relation with the Unruh effect, and on resonance interactions between entangled identical atoms in uniformly accelerated motion. View Full-Text
Keywords: Casimir–Polder interactions; van der Waals forces; vacuum fluctuations; vacuum energy; many-body dispersion interactions Casimir–Polder interactions; van der Waals forces; vacuum fluctuations; vacuum energy; many-body dispersion interactions
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MDPI and ACS Style

Passante, R. Dispersion Interactions between Neutral Atoms and the Quantum Electrodynamical Vacuum. Symmetry 2018, 10, 735. https://0-doi-org.brum.beds.ac.uk/10.3390/sym10120735

AMA Style

Passante R. Dispersion Interactions between Neutral Atoms and the Quantum Electrodynamical Vacuum. Symmetry. 2018; 10(12):735. https://0-doi-org.brum.beds.ac.uk/10.3390/sym10120735

Chicago/Turabian Style

Passante, Roberto. 2018. "Dispersion Interactions between Neutral Atoms and the Quantum Electrodynamical Vacuum" Symmetry 10, no. 12: 735. https://0-doi-org.brum.beds.ac.uk/10.3390/sym10120735

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