Comments on "Translation-invariant bipolarons and the problem of high-temperature superconductivity"
arXiv:1204.4142 · doi:10.1016/j.ssc.2012.05.013
Abstract
We comment on the recent results of Refs. [1, 2] on the bipolaron problem derived using an approximation of Gross - Tulub. It is proved that, contrary to the claim made in Refs. [1, 2], the bipolaron ground state energy calculated there in the strong-coupling approximation has not been shown to constitute a variational upper bound.
3 pages, 2 figures, submitted to Solid State Communications