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2025

Evolving Dark Energy or Evolving Dark Matter?

Chen, Xingang, Loeb, Abraham

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We show that the latest empirical constraints on cosmology, from a combination of DESI, CMB and supernova data, can be accounted for if a small component of dark matter has an evolving and oscillating equation of state within $-1<w<1$.

From a fundamental physics perspective, this interpretation is more appealing than an evolving phantom dark energy with $w<-1$, which violates the null energy condition.

Evolving Dark Energy or Evolving Dark Matter? · Around

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P. Sikivie and Q. Yang, Bose-Einstein Condensation of Dark Matter Axions , Phys. Rev. Lett. 103
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Earlier work this paper cites.

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