Renormalization-group approach for electronic structure

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Abstract
We present a new approach for calculations of the electronic structure of atoms and molecules. The main features are (1) a functional-integral formulation on a lattice in space and imaginary time, (2) renormalization-group transformations which increase lattice spacings to reduce the number of degrees of freedom, (3) perturbation-theory treatments of core electrons, and (4) a Monte Carlo technique using the Langevin equation for nonpertubative calculations of valence-electron properties at low temperatures.