Beyond $\Lambda$CDM with Low and High Redshift Data: Implications for Dark Energy
Abstract
Assuming that the Universe at higher redshifts (z \sim 4 and beyond) is consistent with LCDM model as constrained by the Planck measurements, we reanalyze the low redshift cosmological data to reconstruct the Hubble parameter as a function of redshift. This enables us to address the H_0 and other tensions between low z observations and high z Planck measurement from CMB. From the reconstructed H(z), we compute the energy density for the "dark energy" sector of the Universe as a function of redshift without assuming a specific model for dark energy. We find that the dark energy density has a minimum for certain redshift range and that the value of dark energy at this minimum is negative. This behavior can most simply be described by a negative cosmological constant plus an evolving dark energy component. We discuss possible theoretical and observational implications of such a scenario.
Cite
@article{arxiv.1808.06623,
title = {Beyond $\Lambda$CDM with Low and High Redshift Data: Implications for Dark Energy},
author = {Koushik Dutta and Ruchika and Anirban Roy and Anjan A. Sen and M. M. Sheikh-Jabbari},
journal= {arXiv preprint arXiv:1808.06623},
year = {2020}
}
Comments
v3: 10 pages, 12 .pdf figure, matching the published version