Temperature of Electron Fluctuations in an Accelerated Vacuum

The electron vacuum fluctuations measured by $\cond$ do not vanish in an externally applied electric field $\calE$. For an exactly constant field, that is for vacuum fluctuations in presence of a constant accelerating force, we show that $\cond$ has a Boson-like structure with spectral state density $\tanh^{-1}(E/m)$ and temperature $\TEH = e\calE/mπ= a_v/π$. Considering the vacuum fluctuations of `classical' gyromagnetic ratio $g=1$ particles we find Fermi-like structure with the same spectral state density at a smaller temperature $T_1=a_v/2π$ which corresponds to the Unruh temperature of an accelerated observer.

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