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Rediscussion of charged dilaton-axion black hole entropy

100%

Wang C., Gui Y.

Open Physics

2009

vol. 7

issue 3

521-526

We rediscuss the entropy of a charged dilaton-axion black hole for both the asymptotically flat and non-flat cases by using the thin film brick-wall model. This improved method avoids some drawbacks in the original brick-wall method such as the small mass approximation, neglecting the logarithm term, and taking the term L 3 as the contribution of the vacuum surrounding the black hole. The entropy we obtain turns out to be proportional to the horizon area of the black hole, conforming to the Bekenstein-Hawking area-entropy formula for black holes.

Entropy of charged dilaton-axion black hole with minimal length revisited

88%

Wang C., Gui Y., Xing L.

Open Physics

2009

vol. 7

issue 3

630-637

Using the generalized uncertainty principle, we calculate the entropy of the charged dilaton-axion black hole for both asymptotically flat and non-flat cases by counting degrees of freedom near the horizon. The divergence of density of states and free energy appearing in the thin film brick-wall model is removed without any cutoff. The entropy proportional to the horizon area is derived from the contribution of the vicinity of the horizon.

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2 Open Physics

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2 Gui Y.

2 Wang C.

1 Xing L.

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Rediscussion of charged dilaton-axion black hole entropy

Entropy of charged dilaton-axion black hole with minimal length revisited