| Abstract: | Regarding the universe as an open thermodynamicsystem, the creation of matter/radiation particles outof gravitational energy is investigated. A new class ofFRW models with creation of matter is obtained and their properties are examined. A suitablechoice of the particle number density function n(t) =(A/t )3/2 leads toinflationary solutions during the particle creationphase; subsequently the universe enters the Friedmann era. It is found that fora physically acceptable solution > 1. Acomparative study is made for = 4/3, 2, 8/3, and10/3 in order to find a viable model of theuniverse. |
