Scientists probe weakening dark energy linked to dark matter
Recent DESI observations and a 2025 follow-up study indicate that the strength of dark energy may not be constant: it appears to have peaked about two billion years ago and may now be weakening. The unexpected ‘‘phantom’’ behavior prompted theorists to revisit models in which dark energy and dark matter interact, including proposals that both arise from a single dark sector or a larger ‘‘dark dimension’’ from string theory. These coupled models can reproduce the apparent phantom signal, offer ways to ease the Hubble tension, and suggest possible astrophysical tests to probe a new long-range dark force.
Observations suggest dark energy strength may be changing over time.
Context
In 2024 DESI released results that hinted dark energy changed over time. A 2025 study with more data strengthened that hint. Next steps include more observations and targeted astrophysical tests described in the article.
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