Papers › Testing the nature of Dark Energy with Precision Cosmological constraints
Testing the nature of Dark Energy with Precision Cosmological constraints
A. de la Macorra, E. Almaraz
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We present a Dark Energy (DE) model with a sound derivation as a natural extension of the Standard Model of particle physics with no free parameters and an excellent fit with current cosmological data improving by 21% the ΛCDM fit of the Baryon Acoustic Oscillations (BAO) measurements, specially designed to determine the dynamics of DE. DE corresponds to the lightest bound state scalar particle ϕ with a potential V=Λ_c^(4+2/3)ϕ^(-2/3) dynamically formed at the condensation energy scale Λ_c and scale factor a_c. The value of Λ_c, the exponent n=2/3, and the initial conditions of ϕ are all derived quantities. We obtain an exact constraint a_cΛ_c/eV=1.0939×10⁻⁴ and a theoretical prediction Λ_c=34 ⁺¹⁶₋₁₁ eV, consistent with the best fit Λ_c=44.08±0.27 eV. We test our model constraint on a_cΛ_c by allowing a_c and Λ_c to vary independently and remarkably our prediction has a relative difference of only 0.2% with the best fit value. Unlike a cosmological constant Λ, our DE model predicts the amount of DE and leaves detectable cosmological imprints at different times and scales at a background and perturbation level.
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