{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:RKRRULWLB3FWEI6P5PKDALSSQU","short_pith_number":"pith:RKRRULWL","canonical_record":{"source":{"id":"2605.20748","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-05-20T05:49:49Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"d69c8761ebe7408a8dc4751f9912210831bca0c8e88fc03eea748320ceaf6403","abstract_canon_sha256":"5c802e06d2c37eb44cf2b1f739b521d97484ec8d4bbc642f568195e2d8f7bb6b"},"schema_version":"1.0"},"canonical_sha256":"8aa31a2ecb0ecb6223cfebd4302e52853b0b67288fea0b55a9847cb6fb88c49a","source":{"kind":"arxiv","id":"2605.20748","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.20748","created_at":"2026-05-21T01:04:52Z"},{"alias_kind":"arxiv_version","alias_value":"2605.20748v1","created_at":"2026-05-21T01:04:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.20748","created_at":"2026-05-21T01:04:52Z"},{"alias_kind":"pith_short_12","alias_value":"RKRRULWLB3FW","created_at":"2026-05-21T01:04:52Z"},{"alias_kind":"pith_short_16","alias_value":"RKRRULWLB3FWEI6P","created_at":"2026-05-21T01:04:52Z"},{"alias_kind":"pith_short_8","alias_value":"RKRRULWL","created_at":"2026-05-21T01:04:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:RKRRULWLB3FWEI6P5PKDALSSQU","target":"record","payload":{"canonical_record":{"source":{"id":"2605.20748","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-05-20T05:49:49Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"d69c8761ebe7408a8dc4751f9912210831bca0c8e88fc03eea748320ceaf6403","abstract_canon_sha256":"5c802e06d2c37eb44cf2b1f739b521d97484ec8d4bbc642f568195e2d8f7bb6b"},"schema_version":"1.0"},"canonical_sha256":"8aa31a2ecb0ecb6223cfebd4302e52853b0b67288fea0b55a9847cb6fb88c49a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-21T01:04:52.099958Z","signature_b64":"u9KJ8/1b7SVuFDN/L8gzI25hTnEB9fh0cYqRkZmPht1TpaCZw2z9fF3lt19gecT5WHOUjJRhsrQJVawuC+XmAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8aa31a2ecb0ecb6223cfebd4302e52853b0b67288fea0b55a9847cb6fb88c49a","last_reissued_at":"2026-05-21T01:04:52.099122Z","signature_status":"signed_v1","first_computed_at":"2026-05-21T01:04:52.099122Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.20748","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":"2026-05-21T01:04:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+h8TPM0GC/ndsqNekU6Z5uYBFKYGJVUXyAvD46opoR3hiE3GlKD3bOnZTw9uf9XhIjb5rVBKyMsRyrn2jYYmCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T09:37:34.078189Z"},"content_sha256":"4d084afb9ff995deed6eba8e88d7ab2ecc254e7bc918c4304961866aace45bb7","schema_version":"1.0","event_id":"sha256:4d084afb9ff995deed6eba8e88d7ab2ecc254e7bc918c4304961866aace45bb7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:RKRRULWLB3FWEI6P5PKDALSSQU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Probing late-time deviations from $\\Lambda$CDM with a quadratic dark energy expansion","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.CO","authors_text":"Abra\\~ao J. S. Capistrano, Rafael C. Nunes, Sehjal Khandelwal, Suresh Kumar","submitted_at":"2026-05-20T05:49:49Z","abstract_excerpt":"We investigate the observational viability of a quadratic dark energy expansion (QDEE) model as a phenomenological extension of the standard $\\Lambda\\mathrm{CDM}$ cosmological framework. This approach introduces the additional degrees of freedom that permit mild late-time deviations from a constant dark-energy component while preserving the standard early-Universe behavior. We constrain the model using a comprehensive combination of cosmological datasets, including Planck 2018 cosmic microwave background (CMB) measurements, Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) and South Pole "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.20748","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.20748/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-05-21T01:04:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"idbdttD9kqNW4OgrmpdKPnya1RQv9gaxUibkXL/qyIr+Bm6tkE/AvOuwr1wkfDyYQf4nToDPDEbqHqXErGXVBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T09:37:34.078930Z"},"content_sha256":"ddb33416a65f1f3a890a99a2a67cf69cf523f7a3b5a882535e0a6517a6e59318","schema_version":"1.0","event_id":"sha256:ddb33416a65f1f3a890a99a2a67cf69cf523f7a3b5a882535e0a6517a6e59318"},{"event_type":"integrity_finding","subject_pith_number":"pith:2026:RKRRULWLB3FWEI6P5PKDALSSQU","target":"integrity","payload":{"note":"DOI in the printed bibliography is fragmented by whitespace or line breaks. A longer candidate (10.1103/phys-revd.111.083534) was visible in the surrounding text but could not be confirmed against doi.org as printed.","snippet":"F. Ge, M. Millea, E. Camphuis, C. Daley, Huang, 13 et al., Physical Review D111(2025), 10.1103/phys- revd.111.083534","arxiv_id":"2605.20748","detector":"doi_compliance","evidence":{"ref_index":74,"verdict_class":"incontrovertible","resolved_title":null,"printed_excerpt":"F. Ge, M. Millea, E. Camphuis, C. Daley, Huang, 13 et al., Physical Review D111(2025), 10.1103/phys- revd.111.083534","reconstructed_doi":"10.1103/phys-revd.111.083534"},"severity":"advisory","ref_index":74,"audited_at":"2026-05-21T02:52:59.550833Z","event_type":"pith.integrity.v1","detected_doi":"10.1103/phys-revd.111.083534","detector_url":"https://pith.science/pith-integrity-protocol#doi_compliance","external_url":null,"finding_type":"recoverable_identifier","evidence_hash":"2730e3d94593a3bff277764b2be85bf5338a7a915f2686da0ce2dc7f3a3715ff","paper_version":1,"verdict_class":"incontrovertible","resolved_title":null,"detector_version":"1.0.0","detected_arxiv_id":null,"integrity_event_id":5587,"payload_sha256":"652bee609dbdbe850b209d412b6516d597ba8bdfc1ed305ce482377237d569e5","signature_b64":"aVhIknL2L7dp1HDdxpmxRJbinYpepKtdlSCWukgV7c8W3Wh/TM2bmGBbuQkdLm2Th+VhXguhM/7R302+DtvqBg==","signing_key_id":"pith-v1-2026-05"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-21T02:53:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EAoT8aXAZsM7z9Vx7WZ8F+dIPEs0Tew/tg7nxZEqeS97gjmlMkyRAET0FOPJDg/dT+/lFuB+JUyENXJRvf5aAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T09:37:34.080551Z"},"content_sha256":"b25c11092d08bad76dfaf75319661ae1102e4aa01962e7915a1257f1c4145205","schema_version":"1.0","event_id":"sha256:b25c11092d08bad76dfaf75319661ae1102e4aa01962e7915a1257f1c4145205"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RKRRULWLB3FWEI6P5PKDALSSQU/bundle.json","state_url":"https://pith.science/pith/RKRRULWLB3FWEI6P5PKDALSSQU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RKRRULWLB3FWEI6P5PKDALSSQU/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":"2026-05-22T09:37:34Z","links":{"resolver":"https://pith.science/pith/RKRRULWLB3FWEI6P5PKDALSSQU","bundle":"https://pith.science/pith/RKRRULWLB3FWEI6P5PKDALSSQU/bundle.json","state":"https://pith.science/pith/RKRRULWLB3FWEI6P5PKDALSSQU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RKRRULWLB3FWEI6P5PKDALSSQU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:RKRRULWLB3FWEI6P5PKDALSSQU","merge_version":"pith-open-graph-merge-v1","event_count":3,"valid_event_count":3,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"5c802e06d2c37eb44cf2b1f739b521d97484ec8d4bbc642f568195e2d8f7bb6b","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-05-20T05:49:49Z","title_canon_sha256":"d69c8761ebe7408a8dc4751f9912210831bca0c8e88fc03eea748320ceaf6403"},"schema_version":"1.0","source":{"id":"2605.20748","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.20748","created_at":"2026-05-21T01:04:52Z"},{"alias_kind":"arxiv_version","alias_value":"2605.20748v1","created_at":"2026-05-21T01:04:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.20748","created_at":"2026-05-21T01:04:52Z"},{"alias_kind":"pith_short_12","alias_value":"RKRRULWLB3FW","created_at":"2026-05-21T01:04:52Z"},{"alias_kind":"pith_short_16","alias_value":"RKRRULWLB3FWEI6P","created_at":"2026-05-21T01:04:52Z"},{"alias_kind":"pith_short_8","alias_value":"RKRRULWL","created_at":"2026-05-21T01:04:52Z"}],"graph_snapshots":[{"event_id":"sha256:ddb33416a65f1f3a890a99a2a67cf69cf523f7a3b5a882535e0a6517a6e59318","target":"graph","created_at":"2026-05-21T01:04:52Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2605.20748/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We investigate the observational viability of a quadratic dark energy expansion (QDEE) model as a phenomenological extension of the standard $\\Lambda\\mathrm{CDM}$ cosmological framework. This approach introduces the additional degrees of freedom that permit mild late-time deviations from a constant dark-energy component while preserving the standard early-Universe behavior. We constrain the model using a comprehensive combination of cosmological datasets, including Planck 2018 cosmic microwave background (CMB) measurements, Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) and South Pole ","authors_text":"Abra\\~ao J. S. Capistrano, Rafael C. Nunes, Sehjal Khandelwal, Suresh Kumar","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-05-20T05:49:49Z","title":"Probing late-time deviations from $\\Lambda$CDM with a quadratic dark energy expansion"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.20748","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":"sha256:4d084afb9ff995deed6eba8e88d7ab2ecc254e7bc918c4304961866aace45bb7","target":"record","created_at":"2026-05-21T01:04:52Z","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":"5c802e06d2c37eb44cf2b1f739b521d97484ec8d4bbc642f568195e2d8f7bb6b","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-05-20T05:49:49Z","title_canon_sha256":"d69c8761ebe7408a8dc4751f9912210831bca0c8e88fc03eea748320ceaf6403"},"schema_version":"1.0","source":{"id":"2605.20748","kind":"arxiv","version":1}},"canonical_sha256":"8aa31a2ecb0ecb6223cfebd4302e52853b0b67288fea0b55a9847cb6fb88c49a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8aa31a2ecb0ecb6223cfebd4302e52853b0b67288fea0b55a9847cb6fb88c49a","first_computed_at":"2026-05-21T01:04:52.099122Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-21T01:04:52.099122Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"u9KJ8/1b7SVuFDN/L8gzI25hTnEB9fh0cYqRkZmPht1TpaCZw2z9fF3lt19gecT5WHOUjJRhsrQJVawuC+XmAw==","signature_status":"signed_v1","signed_at":"2026-05-21T01:04:52.099958Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.20748","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4d084afb9ff995deed6eba8e88d7ab2ecc254e7bc918c4304961866aace45bb7","sha256:ddb33416a65f1f3a890a99a2a67cf69cf523f7a3b5a882535e0a6517a6e59318","sha256:b25c11092d08bad76dfaf75319661ae1102e4aa01962e7915a1257f1c4145205"],"state_sha256":"9f0b6ce1524ecab9499f0fe6d608b6f49f3f8edeb3da0265bec2be51854acdd7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lhW7JfE3U0el9jZ4LZ8LmDTkjM84xZWSNAI4/7GHDMou8P8zdwRrDDkTShCg4Z8OQ1XdJ+zBTrBC0OhDP+XhAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-22T09:37:34.084143Z","bundle_sha256":"7af390905ddbde9962242f5dc55d13b426246263e04fd0c0f3c5b0ab7349c586"}}