New Measurements Confirm Universe’s Faster-Than-Expected Expansion
The universe appears to be expanding at a rate that defies current theoretical models and challenges our understanding of physics. A recent study published in The Astrophysical Journal Letters strengthens earlier findings that the universe is expanding faster than predicted, intensifying what scientists call the Hubble tension.
"The tension now turns into a crisis," said Dan Scolnic, the study's lead researcher and an associate professor of physics at Duke University.
Efforts to determine the universe’s expansion rate, known as the Hubble constant, date back to Edwin Hubble's discovery in 1929 that the universe is expanding. Scolnic likens the challenge to constructing the universe's growth chart: we know its size at the Big Bang and its size today, but the models connecting these points don't align.
“This suggests, to some extent, that our cosmological model might be broken,” Scolnic explained.
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Scolnic's team built upon the cosmic ladder—a series of methods used to calculate astronomical distances. Their work relied on data from the Dark Energy Spectroscopic Instrument (DESI), which observes over 100,000 galaxies nightly from Kitt Peak National Observatory. The ladder’s crucial first rung was missing: an accurate distance to the nearby Coma Cluster of galaxies.
Recognizing the importance of this missing piece, Scolnic and his team used light curves from 12 Type Ia supernovae within the Coma Cluster. These supernovae, often referred to as "standard candles," emit predictable luminosity, enabling precise distance measurements. The team determined the Coma Cluster's distance to be approximately 320 million light-years, aligning well with previous studies conducted over the past four decades.
"This measurement isn't biased by expectations of how the Hubble tension will be resolved," Scolnic noted. "The Coma Cluster has been studied long before anyone realized its significance in this debate."
The Hubble tension represents the discrepancy between the universe's observed expansion rate and the predictions of the standard cosmological model. With this latest study providing one of the most precise Hubble constant measurements to date, the mystery surrounding the universe's rapid growth deepens, suggesting that new physics may be required to reconcile the data with theory.