Yonsei: Evidence Suggests Key Assumption of Dark Energy Is in Error

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Yonsei: Evidence Suggests Key Assumption of Dark Energy Is in Error

Post by bystander » Mon Jan 06, 2020 7:12 pm

Evidence Suggests Key Assumption in
Discovery of Dark Energy Is in Error

Yonsei University, South Korea | 2020 Jan 05

High precision age dating of supernova host galaxies reveals that the luminosity evolution of supernovae is significant enough to question the very existence of dark energy

The most direct and strongest evidence for the accelerating universe with dark energy is provided by the distance measurements using type Ia supernovae (SN Ia) for the galaxies at high redshift. This result is based on the assumption that the corrected luminosity of SN Ia through the empirical standardization would not evolve with redshift.

New observations and analysis made by a team of astronomers ... show, however, that this key assumption is most likely in error. The team has performed very high-quality (signal-to-noise ratio ~175) spectroscopic observations to cover most of the reported nearby early-type host galaxies of SN Ia, from which they obtained the most direct and reliable measurements of population ages for these host galaxies. They find a significant correlation between SN luminosity and stellar population age at a 99.5% confidence level. As such, this is the most direct and stringent test ever made for the luminosity evolution of SN Ia. Since SN progenitors in host galaxies are getting younger with redshift (look-back time), this result inevitably indicates a serious systematic bias with redshift in SN cosmology. Taken at face values, the luminosity evolution of SN is significant enough to question the very existence of dark energy. When the luminosity evolution of SN is properly taken into account, the team found that the evidence for the existence of dark energy simply goes away (see Figure 1). ...

Early-type Host Galaxies of Type Ia Supernovae. II. Evidence for
Luminosity Evolution in Supernova Cosmology
~ Yijung Kang et al
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