Author(s)

Erick Almaraz^*, Axel de la Macorra

Instituto de Física, Universidad Nacional Autónoma de México, Ciudad de México, México.

We present a Dark Energy (DE) model based on a scalar field with an inverse power law potential (IPL) V(∅)=M⁴⁺ⁿ∅⁻ⁿ. We consider three different models n=1/2, n=3/4 and n=1 and we vary the value of M and the initial amount of energy density Ω_∅ at the scale factor a_c. We obtain a time dependent equation of state (EoS) , with w_∅=1/3 at early times for a scale factor a_c with a steep transition to w_∅=1 at , , , lasting a long period of time and a subsequent descent w_∅=-1 to for to finally grow to w_∅= -0.906, w_∅=-0.932, w_∅=-0.924 for n=1/2, n=3/4 and n=1 respectively. The values of M and Ω_∅(a_c) are M(eV)= 4.63,127.31,2465.46 and Ω_∅(a_c)=0.038,0.148,0.227 for n= 1/2, n= 3/4 and n=1 respectively. We show the differences in the evolution of H, the CMB and Matter power spectra, and the redshift space distortion (RSD)parameter. Precision cosmological data allow us to test the dynamics of Dark Energy and we obtain in all three cases a reduction of  compared to ∧CDM with and an equivalent fit for CMB and SNIa data.

Cosmology, Dark Energy, Scalar Fields

Almaraz, E. and de la Macorra, A. (2018) Constraints on Dynamical Dark Energy with Precision Cosmological Data. Journal of Modern Physics, 9, 302-313. doi: 10.4236/jmp.2018.92021.