2,884 exploding stars add a new hint that dark energy may be changing, but not proof

Oct 24 · University of Queensland · arXiv

Astronomers at the University of Queensland led by Ryan Camilleri and Tamara Davis have combined 2,884 Type Ia supernovae from six surveys into one carefully calibrated set and measured how the universe’s expansion has sped up. Together with the Dark Energy Survey’s 2024 supernovae, the cosmic microwave background and maps of galaxies, the data again hint that dark energy is not constant but weakens over time. The authors call it a hint, give no discovery-level significance, and note it points in a slightly different direction from DES and DESI. The upcoming DEBASS survey of nearby supernovae should sharpen the test.

Source: University of Queensland · arXiv ↗