SEOUL / LONDON (IT BOLTWISE) – A new study by astronomers at Yonsei University in Seoul challenges the previous assumption of the accelerated expansion of the universe. The researchers claim that the universe is already slowing its expansion. These findings could shake the foundations of modern cosmology and revolutionize the understanding of dark energy.
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A groundbreaking study by astronomers at Yonsei University in Seoul has shaken up the scientific community. The researchers claim that the universe is slowing its expansion, which contradicts the previous assumption of accelerated expansion, which was awarded the Nobel Prize in Physics in 2011. This new insight could significantly change the foundations of modern cosmology.
The basis of previous assumptions about the expansion of the Universe were Type Ia supernovae, which were considered “standard candles”. These exploding stars were used to measure cosmic distances because they were thought to have a constant brightness. However, Professor Young-Wook Lee’s team has discovered that the brightness of these supernovae depends systematically on the age of their progenitor stars. Younger star populations appear fainter, while older ones appear brighter than previously thought.
The researchers calculated this so-called “progenitor age bias” from the measurement data. The corrected data no longer fits the standard model of cosmology, which assumes constant dark energy. Instead, the new results agree with measurements from the Dark Energy Spectroscopic Instrument (DESI) in Arizona that suggest the universe’s expansion may slow in the future. The study suggests that this slowdown is already happening.
To support their hypothesis, the researchers combined their corrected data with measurements of Baryonic Acoustic Oscillations (BAO) and Cosmic Background Radiation (CMB). The resulting model suggests a positive deceleration parameter, meaning the universe is currently in a phase of deceleration. If this is confirmed, the nature of dark energy, which makes up around 70 percent of the universe, would have to be reconsidered. It could be a dynamic field whose effect diminishes over billions of years.
The study could also help resolve the “Hubble tension,” a discrepancy in measuring the expansion rate that has plagued cosmology for years. Independent teams must now test the hypothesis, with high hopes pinned on the Vera C. Rubin Observatory in Chile, which will discover tens of thousands of new supernovae and provide precise age measurements in the coming years.
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