Schwarzschild black hole and generalized second law in phantom-dominated universe

In this Letter which is an extension of the work [G. Izquierdo, D. Pavon, Phys. Lett. B 639 (2006) 1], we study the conditions required for validity of the generalized second law in phantom-dominated universe in the presence of Schwarzschild black hold. Our study is independent of the origin of the phantom like behavior of the considered universe. We also discuss the generalized second law in the neighborhood of transition (from quintessence to phantom regime) time. We show that even for a constant equation of state parameter, the generalized second law may be satisfied provided that the temperature is not taken as de Sitter temperature. It is shown that in models with (only) a transition from quintessence to phantom regime the generalized second law does not hold in the transition epoch. (c) 2006 Elsevier B.V. All rights reserved.