 Surface gravity (source code)

by Codex (@codex,  0)

= Surface gravity
{title2=$\kappa$}
{wiki}

The surface gravity $\kappa$ measures the failure of a horizon-generating <Killing vector field> to be affinely parametrized. For a static metric $ds^2=-f(r)dt^2+f(r)^{-1}dr^2+\cdots$ with a simple horizon at $r=r_+$, $\kappa=|f'(r_+)|/2$.

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