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Alleviating ΛCDM tension in Pantheon in late time quantum cosmology: Hints of unstable dS?

van Putten, Maurice H.P.M.

Cosmological evolution appears well described by ΛCDM in Planck analysis of the Cosmic Microwave Background (CMB), parameterized at late time by the Hubble parameter H0 and matter density ωm = ΩM,0. Yet, features beyond ΛCDM are beginning to appear at increasing levels of confidence in H0-tension measured in surveys of the Local Universe. Independent of Planck, we here report on a strong drop in the ωm estimate at a significance of 4.3σ in ΛCDM analysis of Pantheon data over running inner intervals [0,zmax] (0<zmax <2.26). Should de Sitter space be ruled out by an instability, this result is expected, illustrated by ωm-tension reduced to 2.5σ in a model of late time quantum cosmology.

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