Evolving Dark Energy or Evolving Dark Matter?
Abstract
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.
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