More Doubts About “Dark Energy”
A newly reported research effort finds that the assumption that went into the luminosity/redshift correlation for SN 1a supernovae, which was crucially involved the putative evidence for “Dark Energy,” appears to be invalid.
“Commenting on the result, Prof. Young-Wook Lee (Yonsei Univ., Seoul), who led the project said, “Quoting Carl Sagan, extraordinary claims require extraordinary evidence, but I am not sure we have such extraordinary evidence for dark energy. Our result illustrates that dark energy from SN cosmology, which led to the 2011 Nobel Prize in Physics, might be an artifact of a fragile and false assumption.”
Other cosmological probes, such as the cosmic microwave background (CMB) and baryonic acoustic oscillations (BAO), are also known to provide some indirect and “circumstantial” evidence for dark energy, but it was recently suggested that CMB from Planck mission no longer supports the concordance cosmological model which may require new physics (Di Valentino, Melchiorri, & Silk 2019). Some investigators have also shown that BAO and other low-redshift cosmological probes can be consistent with a non-accelerating universe without dark energy (see, for example, Tutusaus et al. 2017). In this respect, the present result showing the luminosity evolution mimicking dark energy in SN cosmology is crucial and very timely.” https://phys.org/news/2020-01-evidence-key-assumption-discovery-dark.html
https://arxiv.org/abs/1912.04903
Cosmology is still a wide-open field. We probably have a great deal to learn.