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Semiclassical expansion of the ground state for a model of interacting spins in QED

In this article, we consider fixed spin 1/2 particles interacting through the quantized electromagnetic field in a constant magnetic field. We give some asymptotic expansions for the ground state and the ground state energy of the Hamiltonian operator $H(h)$ describing this system. The first terms of these expansions enable to recover elementary formulas for the energy and the magnetic field of the spins when considered as magnets. A first order radiative correction is computed for the energy.

preprint2016arXivOpen access
Laurent AmourJean Nourrigat
math-phmath.MP
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Laurent AmourJean Nourrigat

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