Renormalization group study of the 1d polaron problem
Markus Keil, Herbert Schoeller
Abstract
We investigate the one-dimensional polaron problem and calculate the ground state energy and the effective mass. We use a real-time renormalization group method and compare our results with first and second order perturbation theory, with Feynman's variational principle and with the method of Lee, Low and Pines.
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