- 394

- 2

## Main Question or Discussion Point

Was just curious as to if this equation on wikipedia was accurate.

The link on wiki states

The link on wiki states

http://upload.wikimedia.org/math/9/1/e/91ead79dbf75e21b618af5d067458717.pngThe power emitted by a black hole in the form of Hawking radiation can easily be estimated for the simplest case of a nonrotating, non-charged Schwarzschild black hole of mass M. Combining the formulae for the Schwarzschild radius of the black hole, the Stefan-Boltzmann law of black-body radiation, the above formula for the temperature of the radiation, and the formula for the surface area of a sphere (the black hole's event horizon) we get:

So what I'm wondering is, exactly what units would P or rather the energy outflow be represented as. I was thinking joules, but for some reason couldn't get all the units to cancel out, which is probably just a mistake on my part. Anyway, anyone have any thoughts or input on this subject?where P is the energy outflow, \hbar is the reduced Planck constant, c is the speed of light, and G is the gravitational constant. It is worth mentioning that the above formula has not yet been derived in the framework of semiclassical gravity.