Regular Article – Theoretical Physics
Measurements of and reconstruction of the dark energy properties from a model-independent joint analysis
Departamento de Física, Universidade Federal de Juiz de Fora, 36036-330, Juiz de Fora, MG, Brazil
2 Department of Mathematics, National Institute of Technology, 136119, Kurukshetra, Haryana, India
3 Department of Mathematics, BITS Pilani, Pilani Campus, 333031, Pilani, Rajasthan, India
4 Divisão de Astrofísica, Instituto Nacional de Pesquisas Espaciais, Avenida dos Astronautas 1758, 12227-010, São José dos Campos, SP, Brazil
Accepted: 26 January 2021
Published online: 5 February 2021
Gaussian processes (GP) provide an elegant and model-independent method for extracting cosmological information from the observational data. In this work, we employ GP to perform a joint analysis by using the geometrical cosmological probes such as Supernova Type Ia (SN), Cosmic chronometers (CC), Baryon Acoustic Oscillations (BAO), and the H0LiCOW lenses sample to constrain the Hubble constant , and reconstruct some properties of dark energy (DE), viz., the equation of state parameter w, the sound speed of DE perturbations , and the ratio of DE density evolution . From the joint analysis SN+CC+BAO+H0LiCOW, we find that is constrained at 1.1% precision with , which is in agreement with SH0ES and H0LiCOW estimates, but in tension with the current CMB measurements of . With regard to the DE parameters, we find at at high z, and the possibility of X to become negative for . We compare our results with the ones obtained in the literature, and discuss the consequences of our main results on the DE theoretical framework.
© The Author(s) 2021
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