Dark Energy Cosmological Model Coupled with Perfect Fluid in a Theory of Gravitation

A spatially homogeneous and anisotropic locally rotationally symmetric Bianchi type-I cosmological model with a combination of perfect fluid and dark energy is obtained. The model is then presented in a scalar tensor theory of gravitation proposed by Saez and Ballester [1]. We observed that the anisotropic perfect fluid distribution of dark energy leads to the present accelerated expansion of the universe. Some important features of the model thus obtained have been discussed. It is also interesting to note that in the absence of scalar field we will get back the mixture of perfect fluid and dark energy cosmological model in general relativity.