05-52 Bach V., Froehlich J., Pizzo A.
Infrared-Finite Algorithms in QED: I.~The Groundstate of an Atom Interacting with the Quantized Radiation Field (331K, PostScript) Feb 4, 05
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Abstract. In this first of a series of papers, the groundstate of a nonrelativistic atom, minimally coupled to the quantized radiation field, and its groundstate energy are constructed by an iteration scheme inspired by work of Pizzo. This scheme successively removes an infrared cutoff in momentum space and yields a convergent algorithm enabling us to calculate the groundstate and the groundstate energy, to arbitrary order in the feinstructure constant.

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