期刊
GENERAL RELATIVITY AND GRAVITATION
卷 52, 期 2, 页码 -出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10714-020-2665-4
关键词
Dark energy; Low redshift data; CMB; H-0 tension
资金
- ICTP [NT-04]
- INSF junior chair in black hole physics [950124]
- CSIR, Govt. of India under Junior Research Fellowship
Assuming that the Universe at higher redshifts (z similar to 4 and beyond) is consistent with Lambda CDM model as constrained by the Planck measurements, we reanalyze the low red-shift 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 rho(min)(DE) 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.
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