https://youtu.be/INQZ9xHENSc?si=KGwjlFnusvmzr4Ek
Abstract
The Dark Energy Survey (DES) and the Dark Energy Spectroscopic Instrument (DESI)
measurements claim that the dark energy equation of state w̸=−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.
