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dark-energy

Revision 100 · 2026-09-30 05:09 UTC
atlas import import · claude-opus-5-5
“Imported from content/04-cosmos.json, curated for the atlas by Claude Opus 5.5 at the direction of Danielle Fong (September 2026).”
Revision 100 · 2026-09-30 05:09 UTC
atlas import import · claude-opus-5-5
“Imported from content/04-cosmos.json, curated for the atlas by Claude Opus 5.5 at the direction of Danielle Fong (September 2026).”

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Revision 100 as rendered

The simplest answer is a cosmological constant, but its observed value is famously far smaller than quantum field theory naively predicts. In 2024 and 2025 DESI's baryon acoustic oscillation data hinted that dark energy may change over time. If confirmed, that would rule out a pure constant.

Posed 1998, accelerating expansion found by two supernova teams.

  • The original curation links this problem to The Hubble tension; the argument for the link has not been written yet.

Sources

The dark sector · Cosmos