{"slug":"dark-energy-hubble-tension","topic":"dark-energy-hubble-tension","title":"Dark Energy & Cosmological Tensions: State of the Field (October 2026)","summary":"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.","version":1,"published_at":"2026-10-30","updated_at":"2026-10-30","stats":{"words":3847,"citations":42,"claims":27,"timeline":17,"benchmarks":15,"open_problems":5,"key_papers":14,"glossary":15},"verification":{"status":"verified","method":"automated figure and citation-relevance triage against cited abstracts, targeted AI review with web checks of flagged statements, and a close-out pass hedging or removing unconfirmed statements; automated citation resolution","claims_checked":14,"issues_fixed":6,"verified_at":"2026-10-30"},"ai_assisted":true,"price":{"usd":"0.20","protocol":"x402","network":"eip155:84532","asset":"USDC"},"url":"https://space-kitty.com/dossiers/dark-energy-hubble-tension","preview_url":"https://space-kitty.com/api/v1/dossiers/dark-energy-hubble-tension/preview","purchase_url":"https://space-kitty.com/api/v1/dossiers/dark-energy-hubble-tension","toc":[{"level":2,"text":"Executive summary","anchor":"executive-summary"},{"level":2,"text":"Background and core concepts","anchor":"background-and-core-concepts"},{"level":2,"text":"Timeline of key milestones","anchor":"timeline-of-key-milestones"},{"level":2,"text":"State of the art","anchor":"state-of-the-art"},{"level":3,"text":"Late-universe distance ladder","anchor":"late-universe-distance-ladder"},{"level":3,"text":"Early-universe inference and the CMB","anchor":"early-universe-inference-and-the-cmb"},{"level":3,"text":"BAO and evolving dark energy","anchor":"bao-and-evolving-dark-energy"},{"level":3,"text":"Early dark energy and other early-time proposals","anchor":"early-dark-energy-and-other-early-time-proposals"},{"level":3,"text":"Late-time and interacting dark energy","anchor":"late-time-and-interacting-dark-energy"},{"level":3,"text":"Gravitational-wave standard sirens","anchor":"gravitational-wave-standard-sirens"},{"level":3,"text":"Quantitative benchmarks","anchor":"quantitative-benchmarks"},{"level":2,"text":"Open problems and active debates","anchor":"open-problems-and-active-debates"},{"level":2,"text":"Major programs and players","anchor":"major-programs-and-players"},{"level":2,"text":"Outlook: what to watch (next 12-18 months)","anchor":"outlook-what-to-watch-next-12-18-months"},{"level":2,"text":"Key papers","anchor":"key-papers"},{"level":2,"text":"Glossary","anchor":"glossary"}],"sample_claims":["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."],"includes":["markdown","claims","timeline","benchmarks","open_problems","key_papers","glossary","bibliography"],"citation_count":42,"how_to_buy":"GET https://space-kitty.com/api/v1/dossiers/dark-energy-hubble-tension with an x402 client ($0.20, USDC on Base Sepolia (testnet))."}