{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:4TNAO54WTPUODTE6P2Z3GGWTW4","short_pith_number":"pith:4TNAO54W","canonical_record":{"source":{"id":"1303.4353","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-03-18T18:29:24Z","cross_cats_sorted":[],"title_canon_sha256":"0528b558b626efcd8147cf9013e88aaa0a057b59858d1e47264541e873c62ad4","abstract_canon_sha256":"439c4622779ea56dfec4be51514c581dc1c9701959711869e5a35f72fcd9b8b6"},"schema_version":"1.0"},"canonical_sha256":"e4da0777969be8e1cc9e7eb3b31ad3b71a7a6bf0d36680ebaff754b5c713712b","source":{"kind":"arxiv","id":"1303.4353","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1303.4353","created_at":"2026-05-18T03:14:52Z"},{"alias_kind":"arxiv_version","alias_value":"1303.4353v1","created_at":"2026-05-18T03:14:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1303.4353","created_at":"2026-05-18T03:14:52Z"},{"alias_kind":"pith_short_12","alias_value":"4TNAO54WTPUO","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"4TNAO54WTPUODTE6","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"4TNAO54W","created_at":"2026-05-18T12:27:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:4TNAO54WTPUODTE6P2Z3GGWTW4","target":"record","payload":{"canonical_record":{"source":{"id":"1303.4353","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-03-18T18:29:24Z","cross_cats_sorted":[],"title_canon_sha256":"0528b558b626efcd8147cf9013e88aaa0a057b59858d1e47264541e873c62ad4","abstract_canon_sha256":"439c4622779ea56dfec4be51514c581dc1c9701959711869e5a35f72fcd9b8b6"},"schema_version":"1.0"},"canonical_sha256":"e4da0777969be8e1cc9e7eb3b31ad3b71a7a6bf0d36680ebaff754b5c713712b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:14:52.725276Z","signature_b64":"sq35si7sh6JJ+bgGjG//L2CIoccDArwNd2nu7kRcOiFmiWrryflON2DmuR2dgf32qKdbrjMRACwgkPxo/oXsCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e4da0777969be8e1cc9e7eb3b31ad3b71a7a6bf0d36680ebaff754b5c713712b","last_reissued_at":"2026-05-18T03:14:52.724274Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:14:52.724274Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1303.4353","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:14:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F25dKJeI/yO7yvnuILDqhy7bq/6RozZUMmlg80PqQA47RyB/zxDi+lclpf1edygDcuRxMyETcKnSy803MUyaBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T18:41:53.027914Z"},"content_sha256":"6a79030f9f950d4ed5eb687fedc788531d633330e4291466e0bca2fd68ee48cf","schema_version":"1.0","event_id":"sha256:6a79030f9f950d4ed5eb687fedc788531d633330e4291466e0bca2fd68ee48cf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:4TNAO54WTPUODTE6P2Z3GGWTW4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"New Constraints On The Dark Energy Equation of State","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Alessandra Silvestri, Alessandro Melchiorri, Carlo Baccigalupi, Matteo Martinelli, Najla Said","submitted_at":"2013-03-18T18:29:24Z","abstract_excerpt":"We combine recent measurements of Cosmic Microwave Background Anisotropies, Supernovae luminosity distances and Baryonic Acoustic Oscillations to derive constraints on the dark energy equation of state w in the redshift range 0<z<2, using a principal components approach. We find no significant deviations from the expectations of a cosmological constant. However, combining the datasets we find slight indication for w<-1 at low redshift, thus highlighting how these datasets prefer a non-constant w. Nevertheless the cosmological constant is still in agreement with these observations, while we fin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1303.4353","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:14:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MhfscKDZNNhqGWe7sdSHWSQZ3gZkpeC5OI3hSeoNaEs27NqcT4XsSl3EOOVIJI9Cy/gU5l4TANnj6xc3ChBTCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T18:41:53.028298Z"},"content_sha256":"09b9f1afde590624948627d4eacf8ee91915c408d5d363752241439c010caa4e","schema_version":"1.0","event_id":"sha256:09b9f1afde590624948627d4eacf8ee91915c408d5d363752241439c010caa4e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4TNAO54WTPUODTE6P2Z3GGWTW4/bundle.json","state_url":"https://pith.science/pith/4TNAO54WTPUODTE6P2Z3GGWTW4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4TNAO54WTPUODTE6P2Z3GGWTW4/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-03T18:41:53Z","links":{"resolver":"https://pith.science/pith/4TNAO54WTPUODTE6P2Z3GGWTW4","bundle":"https://pith.science/pith/4TNAO54WTPUODTE6P2Z3GGWTW4/bundle.json","state":"https://pith.science/pith/4TNAO54WTPUODTE6P2Z3GGWTW4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4TNAO54WTPUODTE6P2Z3GGWTW4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:4TNAO54WTPUODTE6P2Z3GGWTW4","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"439c4622779ea56dfec4be51514c581dc1c9701959711869e5a35f72fcd9b8b6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-03-18T18:29:24Z","title_canon_sha256":"0528b558b626efcd8147cf9013e88aaa0a057b59858d1e47264541e873c62ad4"},"schema_version":"1.0","source":{"id":"1303.4353","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1303.4353","created_at":"2026-05-18T03:14:52Z"},{"alias_kind":"arxiv_version","alias_value":"1303.4353v1","created_at":"2026-05-18T03:14:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1303.4353","created_at":"2026-05-18T03:14:52Z"},{"alias_kind":"pith_short_12","alias_value":"4TNAO54WTPUO","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"4TNAO54WTPUODTE6","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"4TNAO54W","created_at":"2026-05-18T12:27:34Z"}],"graph_snapshots":[{"event_id":"sha256:09b9f1afde590624948627d4eacf8ee91915c408d5d363752241439c010caa4e","target":"graph","created_at":"2026-05-18T03:14:52Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We combine recent measurements of Cosmic Microwave Background Anisotropies, Supernovae luminosity distances and Baryonic Acoustic Oscillations to derive constraints on the dark energy equation of state w in the redshift range 0<z<2, using a principal components approach. We find no significant deviations from the expectations of a cosmological constant. However, combining the datasets we find slight indication for w<-1 at low redshift, thus highlighting how these datasets prefer a non-constant w. Nevertheless the cosmological constant is still in agreement with these observations, while we fin","authors_text":"Alessandra Silvestri, Alessandro Melchiorri, Carlo Baccigalupi, Matteo Martinelli, Najla Said","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-03-18T18:29:24Z","title":"New Constraints On The Dark Energy Equation of State"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1303.4353","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:6a79030f9f950d4ed5eb687fedc788531d633330e4291466e0bca2fd68ee48cf","target":"record","created_at":"2026-05-18T03:14:52Z","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":"439c4622779ea56dfec4be51514c581dc1c9701959711869e5a35f72fcd9b8b6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-03-18T18:29:24Z","title_canon_sha256":"0528b558b626efcd8147cf9013e88aaa0a057b59858d1e47264541e873c62ad4"},"schema_version":"1.0","source":{"id":"1303.4353","kind":"arxiv","version":1}},"canonical_sha256":"e4da0777969be8e1cc9e7eb3b31ad3b71a7a6bf0d36680ebaff754b5c713712b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e4da0777969be8e1cc9e7eb3b31ad3b71a7a6bf0d36680ebaff754b5c713712b","first_computed_at":"2026-05-18T03:14:52.724274Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:14:52.724274Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sq35si7sh6JJ+bgGjG//L2CIoccDArwNd2nu7kRcOiFmiWrryflON2DmuR2dgf32qKdbrjMRACwgkPxo/oXsCw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:14:52.725276Z","signed_message":"canonical_sha256_bytes"},"source_id":"1303.4353","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6a79030f9f950d4ed5eb687fedc788531d633330e4291466e0bca2fd68ee48cf","sha256:09b9f1afde590624948627d4eacf8ee91915c408d5d363752241439c010caa4e"],"state_sha256":"9bb67c5041420149b56a45108f9fc6629e9e3cd9381907acf573c630db7714ab"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IaHOYjAZKVBw9GS+skSiA/qN7tWK06s3AEJ7MpnzEjzoo1CcCoLvlo7NT6d57VCI+OMQH3DRrCy7jUufGIQRAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T18:41:53.030232Z","bundle_sha256":"957bf6ed6df106878736f1ee2a88c2910863c8873cbc4841028d2708d6246d9e"}}