Spin-spin effects from non-relativistic limit of Dirac-Pauli-Maxwell Lagrangian

• URL: http://arxiv.org/abs/2608.28904v1
• Date: Fri, 28 Aug 2026 22:06:40 GMT
• Title: Spin-spin effects from non-relativistic limit of Dirac-Pauli-Maxwell Lagrangian
• Abstract summary: We take the non-relativistic limit of the Dirac-Maxwell Lagrangian, using the Foldy-Wouthuysen transformation.<n>We calculate the correction terms to electromagnetic spin-spin interactions in the non-relativistic limit.<n>We study some of the physical effects of these terms regarding spin-spin interactions and spin-spin entanglements.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: It is natural to expect that the electromagnetic spin-spin interaction has roots in a more fundamental theory: quantum electrodynamics in this case. To show this, we take the non-relativistic limit of the Dirac-Maxwell Lagrangian, using the Foldy-Wouthuysen transformation and derive the Breit interaction by an alternative approach. By adding the Pauli term (i.e., a higher-order interaction between spin and the electromagnetic field), we calculate the correction terms to electromagnetic spin-spin interactions in the non-relativistic limit. Finally, we study some of the physical effects of these terms regarding spin-spin interactions and spin-spin entanglements. Accordingly, we provide theoretical estimates that are not yet accessible with current experiments.

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