We study low-temperature effects of frequency-dependent damping on spectral and dynamical properties of biased two-level systems. Inherent inconsistencies of the noninteracting-blip approximation are removed by systematically considering the interblip interactions to first order in the coupling strength. The self-energy contribution from all irreducible multi-blip clusters is taken into account. We discuss the influence of phonons and the effects of the superconducting state.
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Görlich et al. (1989) studied this question.