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Paper   IPM / Physic / 16247
School of Physics
  Title:   Beyond Lambda CDM with low and high redshift data: implications for dark energy
1.  K. Dutta
2.  A. Roy
3.  Ruchika.
4.  A. A. Sen
5.  M.M. Sheikh-Jabbari
  Status:   Published
  Journal: Gen. Relat. Gravit.
  Vol.:  52
  Year:  2019
  Pages:   15
  Supported by:  IPM
Assuming that the Universe at higher redshifts (z  ∼ 4 and beyond) is consistent with 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 H0 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 \rdemin 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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