A Further Analysis of a Cosmological Model of Quintessence and Scalar Dark Matter.pdf

A Further Analysis of a Cosmological Model with Quintessence and Scalar Dark Matter. Tonatiuh Matos∗ and L. Arturo Ure˜na-L´opez† Departamento de F´ısica, Centro de Investigaci´on y de Estudios Avanzados del IPN, AP 14-740, 07000 M´exico D.F., MEXICO. (February 1, 2008) We present the complete solution to a 95% scalar field cosmological model in which the dark matter is modeled by a scalar field Φ with the scalar potential V (Φ) = Vo [cosh (λ √κ Φ) − 1] o ˜ and the dark energy is modeled by a scalar field Ψ, endowed with the scalar potential V (Ψ) = ˜ √κ Ψ)]β . This model has only two free parameters, λ and the equation of state ω . Vo [sinh (α o Ψ With these potentials, the fine tuning and the cosmic coincidence problems are ameliorated for 0 both dark matter and dark energy and the models agrees with astronomical observations. For the 0 scalar dark matter, we clarify the meaning of a scalar Jeans lenght and then the model predicts 0 a sup