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Research dossier · version 1 · updated Oct 30, 2026

Dark Energy & Cosmological Tensions: State of the Field (October 2026)

Covers the Hubble tension between local distance-ladder and early-universe measurements of the expansion rate, the DESI evidence for evolving dark energy, sensitivity to supernova calibration, and the early- and late-time extensions proposed in response. The main takeaway: the local-versus-early H0 gap persists across independent methods, while the DESI preference for evolving dark energy is statistically notable but depends on the supernova sample and remains unsettled.

3,847 words42 sources27 evidence-mapped claims15 benchmarks17 timeline events✓ citation-verified Oct 30, 2026

AI-assisted synthesis of the cited literature, independently fact-checked against its sources; not peer reviewed.

Contents

  1. Executive summary
  2. Background and core concepts
  3. Timeline of key milestones
  4. State of the art
  5. Late-universe distance ladder
  6. Early-universe inference and the CMB
  7. BAO and evolving dark energy
  8. Early dark energy and other early-time proposals
  9. Late-time and interacting dark energy
  10. Gravitational-wave standard sirens
  11. Quantitative benchmarks
  12. Open problems and active debates
  13. Major programs and players
  14. Outlook: what to watch (next 12-18 months)
  15. Key papers
  16. Glossary

Sample findings

  • Planck 2018 gives H0 = 67.4 ± 0.5 km/s/Mpc in base flat ΛCDM.
  • DESI DR1 BAO with a BBN prior and θ* gives H0 = 68.52 ± 0.62 km/s/Mpc; adding Planck and ACT CMB lensing gives 67.97 ± 0.38 km/s/Mpc.
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