Kavli Affiliate: Michael Turner
| Summary:
Measurements of baryon acoustic oscillations (BAO) by the Dark Energy Spectroscopic Instrument (DESI) have revealed evidence for dark energy that evolves. If local distance measurements are analyzed with the $w_0w_a$ models preferred by the DESI measurements, the value for the Hubble constant can be as much as $2.5,mathrmkm,s^-1Mpc^-1$ smaller than the value obtained assuming $Λ$CDM. When these $w_0w_a$ models are further constrained by cosmic microwave background (CMB) and type Ia supernova (SNIa) data, the downward shift is $1.1 pm 0.38,mathrmkm,s^-1Mpc^-1$ (DESI + CMB) and $0.5 pm 0.1,mathrmkm,s^-1Mpc^-1$ (DESI + CMB + SNIa). The dependence of local determinations of $H_0$ on the background cosmology, combined with the fact that the low-redshift cosmology is not well constrained, is relevant to the Hubble tension.
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