Mass vs. Charge: Quantum Radiation from Zero Temperature Black Holes

Physics – High Energy Physics – High Energy Physics - Theory

Scientific paper

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CALT-68-1874, LaTeX, 10 pages, one separate figure

Scientific paper

10.1016/0370-2693(93)91567-7

We study the mass-charge relation for the semiclassical extremal black hole of the $S$-wave sector Einstein-Maxwell theory coupled to $N$ conformal scalars. The classical ratio $M/{|Q|}=1$ is shown to be modified to $M/{|Q|} \simeq 1-k/6$ for small $ k \equiv N\hbar/(12\pi Q^{2})$. Furthermore, numerical study for $k<2$ shows that $M/|Q|$ is a monotonically decreasing function of $k$. We speculate on the consequence of such a modification in the 4-dimensional context.

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