Considering a spherically symmetric nonstatic cosmological flat model of the Robertson-Walker universe, the problem of perfect fluid distribution interacting with the gravitational field in the presence of a zero-rest-mass scalar field and electromagnetic field in Brans-Dicke (B-D) theory has been investigated. Exact solutions are obtained by using a general approach of solving the partial differential equations and it has been observed that the electromagnetic field cannot survive the cosmological flat model due to the action caused by the presence of the zero-rest-mass scalar field, and the isotropic pressure p turns out to be negative. The pressure and density are found to be independent of time.
SINGH, KANGUJAM PRIYOKUMAR and SINGH, CHUNGKHAM GOKULCHANDRA
"Exact solution of FRW perfect fluid model interacting with zero-rest-mass scalar field and electromagnetic field in B-D theory,"
Turkish Journal of Physics: Vol. 37:
3, Article 15.
Available at: https://journals.tubitak.gov.tr/physics/vol37/iss3/15