The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 3 3 2019 11 26 Cosmological solutions of Brans-Dicke equations with cosmological constant Cosmological solutions of Brans-Dicke equations with cosmological constant 177 183 682 FA I. Ahmadi-Azar Journal Article 2019 11 26   In this paper, the analytical solutions of Brans-Dicke (B-D) equations with cosmological constant are presented, in which the equation of state of the universe is P=mÙ° ρ , under the assumption φRn=c between the B-D field and the scale factor of the universe. The flat (K=0) Robertson- Walker metric has been considered for the metric of the universe. These solutions are rich in the sense that they include dust B-D theory with cosmological constant, Nariai Ù=° solutions, vacuum solutions of Ohanlen-Tupper and inflationary  Ù=° solutions.   In this paper, the analytical solutions of Brans-Dicke (B-D) equations with cosmological constant are presented, in which the equation of state of the universe is P=mÙ° ρ , under the assumption φRn=c between the B-D field and the scale factor of the universe. The flat (K=0) Robertson- Walker metric has been considered for the metric of the universe. These solutions are rich in the sense that they include dust B-D theory with cosmological constant, Nariai Ù=° solutions, vacuum solutions of Ohanlen-Tupper and inflationary  Ù=° solutions. https://ijpr.iut.ac.ir/article_682_08d98638c6fcd194a4b1e6992063e944.pdf