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Putting 2,884 Type Ia supernovae on one 30-year scale left a dark-energy tension
Researchers rebuilt light measurements from 2,884 Type Ia supernovae gathered over 30 years into one consistent analysis. Combined with relic light and galaxy-distribution data, the result still allowed dark energy to vary with time.
This is not a definitive detection of evolving dark energy. The deviation is sensitive to calibration and data combinations, and its direction and size do not exactly match every earlier DES or DESI hint.
Why Type Ia?
Their brightness can be standardised, making them distance indicators. Comparing distance and redshift traces the expansion history.
What was redone?
The team harmonised telescope response, dust, colour and light curves, host-galaxy mass and lensing, applying modern knowledge to old observations.
What does 2,884 buy?
The largest broad compilation improves statistics, but shared systematic errors do not vanish with sample size. Host properties and selection remain crucial.
What can be claimed?
The compilation increases tension with a fixed cosmological constant, but it does not identify dark energy or determine its evolution law.
Next test
DEBASS and future surveys need the same calibration, followed by consistency checks against independent BAO and CMB measurements.
Primary source and independent checks
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