Finite Temperatur Dynamic Susceptibility of the Free Bose Gas
Abstract
A detailed calculation of the real part of the finite temperature dynamic susceptibility of the free Bose gas is presented. After a short discussion on the different ways in which it can be calculated for temperatures above and below the Bose--Einstein transition temperature, its main properties and its evolution with q and T are analyzed. Finally, expressions for the lowest order energy weighted sum rules are also derived and studied.
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