Abstract
We introduce effective Lagrangian with spontaneously broken density and the massive internal gauge fields based on the Sethna–Sachdev–Nelson formula, and propose an explanation for the increase of the positron diffusion length in the liquid metal phase with temperature. It is shown that the effective mass of the positron in the liquid phase decreases with temperature due to restoration of the spontaneously broken density and the massive gauge fields around the positron.
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