2,884 Supernovae Add Evidence That Dark Energy May Change Over Time
A University of Queensland-led team assembled observations of 2,884 Type Ia supernovae, combining decades of measurements to track cosmic expansion. The analysis found a departure from the standard model, which treats dark energy as constant, though the direction differs from earlier Dark Energy Survey results; the researchers say the evidence is not conclusive.
Bottom line — The team plans to add observations from DEBASS, which is detecting hundreds of supernovae closer to Earth.
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The team reanalysed older observations using improved understanding of supernova behaviour, according to the University of Queensland.
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Researchers accounted for telescope differences, cosmic dust, host galaxy mass and gravitational lensing when comparing measurements.
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The analysis also combined supernova observations with relic light from the Big Bang and maps of galaxy distribution.
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The Dark Energy Spectroscopic Instrument has independently found hints of variation by studying relic sound waves, the University of Queensland reported.
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The University of Queensland said the new compilation’s deviation from the standard model points in a slightly different direction from the 2024 Dark Energy Survey results.
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Researchers said understanding dark energy could offer clues to how gravity and quantum physics fit together.
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