The black hole entropy is proportional to the area of its event horizon .

Although general relativity can be used to perform a semi-classical calculation of black hole entropy, this situation is theoretically unsatisfying.

He concluded that the black hole entropy is directly proportional to the area of the event horizon.

From the black hole temperature, it is straightforward to calculate the black hole entropy.

Their black hole entropy can be calculated in string theory.

The concept of black hole entropy poses some interesting conundra.

What, then, are the "degrees of freedom" which can give rise to black hole entropy?

Therefore, calculating black hole entropy requires working in a regime where string interactions exist.

Most recently, Thiemann at el have made progress toward calculating black hole entropy for supergravty in higher dimensions.

The Planck area, equal to the square of the Planck length, plays a role in black hole entropy.