 01478 Christian Hainzl
 One nonrelativistic particle coupled to a photon field
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Dec 19, 01

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Abstract. We investigate the ground state energy of a charged particle coupled to a photon field.
First, we regard the selfenergy of a "free" electron, which we describe by the PauliFierz Hamiltonian. We show that, in the case of small values of the coupling constant $\alpha$, the leading order term is represented by $8\pi \alpha (\Lambda  \ln[1 + \Lambda])$.
Secondly, we treat the selfenergy of a charged boson and provide a different proof for recovering the next to leading order term in $\alpha$, which has already been obtained in a previous paper.
Thirdly, we estimate from above the binding energy of a charged boson in the field of a nucleus. The first order radiative correction turns out to behave like $\ln[1+\Lambda]$ for large values of the ultravioletcutoff parameter $\Lambda$.
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