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| Paper IPM / P / 17666 | ||||||||||||||||||||||||||||||
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Within the Friedmann-Lema\^itre-Robertson-Walker (FLRW) framework, the Hubble constant H0 is an integration constant. Thus, mathematical consistency demands that H0 is also observationally a constant. Building on earlier results, we demonstrate redshift evolution of flat ΛCDM cosmological parameters (H0,Ωm) in Pantheon+ supernove (SN) in the redshift range 0<z≲. We compare the whole SN sample and the SN sample split into low and high redshift subsamples demarcated by redshift z_{\textrm{split}}. We show that z_{\textrm{split}}=1 has a marginal Bayesian preference through the Akaike Information Criterion for evolution in H_0 (also \Omega_m) compared to the whole sample. Such evolution is strictly forbidden in FLRW models. Through mock analysis, we estimate the evolution as a 1.4 \sigma effect (p=0.08), and the presence of \Omega_m >1 best fits, indicative of negative dark energy (DE) density, beyond z_{\textrm{split}} =1 as 1.3 \sigma (p=0.1) to 1.9 \sigma effects (p=0.026) depending on the criteria. {Finally, using complementary profile distributions we confirm a robust > 2 \sigma shift in H_0 for SN with z > 1.
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