Entropy of Schwarzschild–de Sitter Black Hole in Non-Thermal-Equilibrium.

Starting from the Klein-Gordon equation, we calculate the entropy of Schwarzschild-de Sitter black hole in non-thermal-equilibrium by using the improved brick-wall methodmembrane model. When taking the proper cutoff in the obtained result, we obtain that both black hole's entropy and cosmic entropy are proportional to the areas of event horizon. We avoid the logarithmic term and stripped term in the original brick-wall method. It offers a new way of studying the entropy of the black hole in non-thermal-equilibrium. [ABSTRACT FROM AUTHOR]