Negative heat capacity of a Schwarzschild black hole
= Negative heat capacity of a Schwarzschild black hole
{title2=$C=-8\pi M^2$}
In units $G=\hbar=c=k_B=1$, a <Schwarzschild black hole> has <Hawking temperature> $T=1/(8\pi M)$, so its <heat capacity> is $dM/dT=-8\pi M^2$. It heats up as it loses <mass>, preventing stable canonical equilibrium with an unlimited thermal reservoir.