Antonio Alfonso-Faus

E.U.I.T. Aeronáutica, Plaza Cardenal Cisneros s/n Madrid 28040, Spain
E-mail: [email protected]

Received: 10 May 2000 / Accepted: 29 July 2000 / Published: 7 September 2000

Abstract: We propose a new definition of entropy for any mass m, based on gravitation and through the concept of a gravitational cross section. It turns out to be proportional to mass, and therefore extensive, and to the age of the Universe. It is a Machian approach. It is also the number of gravity quanta the mass has emitted through its age. The entropy of the Uni-verse is so determined and the cosmological entropy problem solved.

Keywords: entropy; gravity quanta; black holes; Mach; cosmology.