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Huber, Zack Li","cross_cats":["hep-ph"],"headline":"ACT DR6 power spectra combined with Planck data constrain the universe's composition, expansion rate, and initial conditions within the standard ΛCDM model.","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-03-18T17:30:16Z","title":"The Atacama Cosmology Telescope: DR6 Power Spectra, Likelihoods and $\\Lambda$CDM Parameters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2503.14452","kind":"arxiv","version":2},"verdict":{"created_at":"2026-05-13T14:39:19.480882Z","id":"ff116e8a-dda6-4799-920d-d825ea886809","model_set":{"reader":"grok-4.3"},"one_line_summary":"ACT DR6 CMB spectra combined with Planck and DESI data constrain ΛCDM parameters including Ω_b h²=0.0226±0.0001, H0=68.22±0.36 km/s/Mpc, and σ8=0.813±0.005.","pipeline_version":"pith-pipeline@v0.9.0","pith_extraction_headline":"ACT DR6 power spectra combined with Planck data constrain the universe's composition, expansion rate, and initial conditions within the standard ΛCDM model.","strongest_claim":"Combining ACT with larger-scale Planck data, the joint P-ACT dataset provides tight limits on the ingredients, expansion rate, and initial conditions of the universe, yielding Ω_b h²=0.0226±0.0001, Ω_c h²=0.118±0.001, H0=68.22±0.36 km/s/Mpc, n_s=0.974±0.003, and σ8=0.813±0.005.","weakest_assumption":"The assumption that the measured ACT angular power spectra over 10,000 deg² are well fit by the sum of CMB (described by ΛCDM) plus foregrounds, with no significant unmodeled systematics or excess lensing."}},"verdict_id":"ff116e8a-dda6-4799-920d-d825ea886809"}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:824b057fde618065445217ae665c15daaff16d34f8f6811632e154aefc59b176","target":"record","created_at":"2026-07-05T11:26:27Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"fc15c9258e76144f0473a42139dda5d08292977ba8b3fa2e9b0be42cf4895ba1","cross_cats_sorted":["hep-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-03-18T17:30:16Z","title_canon_sha256":"b6e8121b896f720952dac1d9256b3dd04535ef2bbd65661655ce27137ab2a809"},"schema_version":"1.0","source":{"id":"2503.14452","kind":"arxiv","version":2}},"canonical_sha256":"041f150edb7a3ba0cb01c057d3fa7886e39d98443479edf86a04e962d11bfd0b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"041f150edb7a3ba0cb01c057d3fa7886e39d98443479edf86a04e962d11bfd0b","first_computed_at":"2026-07-05T11:26:27.796879Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:26:27.796879Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1ILQT24uLh6xwPINjspTeu5HA+vsOrM9CFOGI45xuQpLPBNff5swN5kRBY4+X6QQgB3PZhIZBnY4wm3s6oJGAw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:26:27.797437Z","signed_message":"canonical_sha256_bytes"},"source_id":"2503.14452","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:824b057fde618065445217ae665c15daaff16d34f8f6811632e154aefc59b176","sha256:a44f3a239714e7b4d6c042be332e1833a226c663852a81abf88ddec1ad096001"],"state_sha256":"0a57f738562f03af7d1e7893af6bd9536b42cac24446d4017b3f0cc3fada4050"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R6uUaCiplFYKOYddw2GpZc2KOWmvyvlC8uSqRBqQMXAhv7uMZhHUlFSOn1nQeTmwE3d6lIhxkEiM3u8bK4yEAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T22:30:27.033740Z","bundle_sha256":"989de18744138ec73437011be31ab3398083b8aa3ad4a30b82b619488df66978"}}