The Cosmic Metronome Falls Out of Rhythm: Dark Energy Rewrites Hubble's Symphony ✦
Original: "The DESI results impact the local determination of $$H_0$$"
New DESI data suggests that evolving dark energy can slow down the local expansion of the Universe by 2.5 km/s/Mpc — and possibly resolve the Hubble tension puzzle.
Links in the knowledge graph 1
From 500 to 73 — and down again? The Hubble constant turned out to have a personality. DESI data suggests dark energy is conducting the expansion, slowing down the tempo. This might resolve the Hubble tension drama and rewrite the cosmic score.
🎯 Edwin Hubble himself first calculated the Hubble constant as 500 km/s/Mpc — almost seven times higher than today's value. It took a whole century to squeeze the error down to one percent, yet the discrepancy between the early and late Universe makes us wonder: what if the 'constant' itself isn't quite constant?
d_L = \frac{c z}{H_0}
Luminosity distance is proportional to redshift z, inversely proportional to the Hubble constant H0
w(a) = w_0 + w_a (1 - a)
w(a) is the dark energy equation of state depending on the scale factor a; w0 is the present-day value, wa is the rate of evolution
Scientists
Alan GuthAndrei LindeGeorges LemaîtreJames PeeblesAdam RiessBrian Schmidtexpansion of the universe
dark energy
cosmic microwave background
supernova
spectroscopy
galaxy
dark matter
big bangLaws
Friedmann equationsHubble's lawDoppler effectgravitational lensingEinstein field equationsMaxwell's equations