Abstract
Brownian motion of a heavy charged particle at zero and small (but finite) temperature is studied in presence of finite density. We are primarily interested in the dynamics at (near) zero temperature which is holographically described by motion of a fundamental string in an (near-) extremal Reissner-Nordstr$\ddot{\text{o}}$m black hole. We analytically compute the functional form of retarded Green's function for small frequencies and extract the dissipative behavior at and near zero temperature.
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