Remo Garattini

Università degli Studi di Bergamo, Facoltà di Ingegneria, Viale Marconi, 5, 24044 Dalmine (Bergamo),Italy.
E-mail: [email protected]

Received: 21 December 1999 / Accepted: 22 February 2000 / Published: 15 March 2000

Abstract: The entropy for a black hole in a de Sitter space is approached within the frame-work of spacetime foam. A simple model made by N wormholes in a semiclassical approximation, is taken under examination to compute the entropy for such a case. An extension to the extreme case when the black hole and cosmological horizons are equal is discussed.