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Published 18 September 2025 •
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Journal of Cosmology and Astroparticle Physics,
Volume 2025,
September 2025Citation Hoang Nhan Luu et al JCAP09(2025)055DOI 10.1088/1475-7516/2025/09/055
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1475-7516/2025/09/055
Abstract
The Dark Energy Survey (DES) and the Dark Energy Spectroscopic Instrument (DESI) measurements claim that the dark energy equation of state w ≠ -1. This observation can be explained by the axion Dark Energy (aDE) model of an ultralight axion plus a cosmological constant Λ. Despite a relatively large degeneracy, there is a high probability that Λ<0. This negative Λ leads the universe to end in a big crunch. Using the best-fit values of the model as a benchmark, we find the lifespan of our universe to be 33 billion years.
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