{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:35XMKBOMND2IC6P2EBO7SJT5NP","short_pith_number":"pith:35XMKBOM","canonical_record":{"source":{"id":"1908.01953","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-06T04:38:53Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"e663e6adfa5658c6f88b04e0c56ca177e5b214d6349b906eb2d4ce6272c7a4de","abstract_canon_sha256":"6d864dfa036e5ca795d67da58b9d0419bd6ec6fc014ff67780d8dcdc4bbd2a86"},"schema_version":"1.0"},"canonical_sha256":"df6ec505cc68f48179fa205df9267d6bfcf70d049ceb3a47163bb462b3fd4a30","source":{"kind":"arxiv","id":"1908.01953","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.01953","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"arxiv_version","alias_value":"1908.01953v2","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.01953","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"pith_short_12","alias_value":"35XMKBOMND2I","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"pith_short_16","alias_value":"35XMKBOMND2IC6P2","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"pith_short_8","alias_value":"35XMKBOM","created_at":"2026-07-05T00:25:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:35XMKBOMND2IC6P2EBO7SJT5NP","target":"record","payload":{"canonical_record":{"source":{"id":"1908.01953","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-06T04:38:53Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"e663e6adfa5658c6f88b04e0c56ca177e5b214d6349b906eb2d4ce6272c7a4de","abstract_canon_sha256":"6d864dfa036e5ca795d67da58b9d0419bd6ec6fc014ff67780d8dcdc4bbd2a86"},"schema_version":"1.0"},"canonical_sha256":"df6ec505cc68f48179fa205df9267d6bfcf70d049ceb3a47163bb462b3fd4a30","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:25:28.021687Z","signature_b64":"R7DP6vgQ2G+wXWrKopsVuOfYeqpGSgjCS/2QT42M/wiTB3Kk/aiQJ8kJFL+BlqtTGDdr2EEXcY/ZRJU+qwpsBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"df6ec505cc68f48179fa205df9267d6bfcf70d049ceb3a47163bb462b3fd4a30","last_reissued_at":"2026-07-05T00:25:28.021232Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:25:28.021232Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.01953","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T00:25:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"u/UW+Ar3ZabAgdKo5Cv2WyiOOQAakDLr2dcPt9Bh0jm0FuVhq8V9xyD2wcvYFEA0Y6EZr7Ixft98doW1bNhZCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T23:19:48.217764Z"},"content_sha256":"bea80744842d9594bb96f095a06575ff411c4bedfd9e99372d2f2e77d72e2b32","schema_version":"1.0","event_id":"sha256:bea80744842d9594bb96f095a06575ff411c4bedfd9e99372d2f2e77d72e2b32"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:35XMKBOMND2IC6P2EBO7SJT5NP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Probing the independence within the dark sector in the fluid approximation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.CO","authors_text":"Geraint F. Lewis, Krzysztof Bolejko, Lawrence Dam","submitted_at":"2019-08-06T04:38:53Z","abstract_excerpt":"The standard model of cosmology is based on two unknown dark components that are uncoupled from each other. In this paper we investigate whether there is evidence for an interaction between these components of cold dark matter (CDM) and dark energy (DE). In particular, we focus on a minimal extension and reconstruct the interaction history at low-redshifts non-parametrically using a variation of the commonly used principal component analysis. Although we focus on the interaction in the dark sector, any significant deviation from the standard model that changes the expansion history of the Univ"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.01953","kind":"arxiv","version":2},"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/1908.01953/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":"2026-07-05T00:25:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"i63vrwdUDXIOHodSrShFFSDuHMrMtboRDW1mYRkqCLplXWzqc+G/FGbCY7G2jaHTIc56z3qKI1J3b6+zgWfbAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T23:19:48.218311Z"},"content_sha256":"79f1b2ab63a1d1592ef4a53eebb84885a04318aabf7dd96129754665d1191043","schema_version":"1.0","event_id":"sha256:79f1b2ab63a1d1592ef4a53eebb84885a04318aabf7dd96129754665d1191043"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/35XMKBOMND2IC6P2EBO7SJT5NP/bundle.json","state_url":"https://pith.science/pith/35XMKBOMND2IC6P2EBO7SJT5NP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/35XMKBOMND2IC6P2EBO7SJT5NP/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":"2026-08-14T23:19:48Z","links":{"resolver":"https://pith.science/pith/35XMKBOMND2IC6P2EBO7SJT5NP","bundle":"https://pith.science/pith/35XMKBOMND2IC6P2EBO7SJT5NP/bundle.json","state":"https://pith.science/pith/35XMKBOMND2IC6P2EBO7SJT5NP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/35XMKBOMND2IC6P2EBO7SJT5NP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:35XMKBOMND2IC6P2EBO7SJT5NP","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":"6d864dfa036e5ca795d67da58b9d0419bd6ec6fc014ff67780d8dcdc4bbd2a86","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-06T04:38:53Z","title_canon_sha256":"e663e6adfa5658c6f88b04e0c56ca177e5b214d6349b906eb2d4ce6272c7a4de"},"schema_version":"1.0","source":{"id":"1908.01953","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.01953","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"arxiv_version","alias_value":"1908.01953v2","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.01953","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"pith_short_12","alias_value":"35XMKBOMND2I","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"pith_short_16","alias_value":"35XMKBOMND2IC6P2","created_at":"2026-07-05T00:25:28Z"},{"alias_kind":"pith_short_8","alias_value":"35XMKBOM","created_at":"2026-07-05T00:25:28Z"}],"graph_snapshots":[{"event_id":"sha256:79f1b2ab63a1d1592ef4a53eebb84885a04318aabf7dd96129754665d1191043","target":"graph","created_at":"2026-07-05T00:25:28Z","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/1908.01953/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The standard model of cosmology is based on two unknown dark components that are uncoupled from each other. In this paper we investigate whether there is evidence for an interaction between these components of cold dark matter (CDM) and dark energy (DE). In particular, we focus on a minimal extension and reconstruct the interaction history at low-redshifts non-parametrically using a variation of the commonly used principal component analysis. Although we focus on the interaction in the dark sector, any significant deviation from the standard model that changes the expansion history of the Univ","authors_text":"Geraint F. Lewis, Krzysztof Bolejko, Lawrence Dam","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-06T04:38:53Z","title":"Probing the independence within the dark sector in the fluid approximation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.01953","kind":"arxiv","version":2},"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:bea80744842d9594bb96f095a06575ff411c4bedfd9e99372d2f2e77d72e2b32","target":"record","created_at":"2026-07-05T00:25:28Z","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":"6d864dfa036e5ca795d67da58b9d0419bd6ec6fc014ff67780d8dcdc4bbd2a86","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-06T04:38:53Z","title_canon_sha256":"e663e6adfa5658c6f88b04e0c56ca177e5b214d6349b906eb2d4ce6272c7a4de"},"schema_version":"1.0","source":{"id":"1908.01953","kind":"arxiv","version":2}},"canonical_sha256":"df6ec505cc68f48179fa205df9267d6bfcf70d049ceb3a47163bb462b3fd4a30","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"df6ec505cc68f48179fa205df9267d6bfcf70d049ceb3a47163bb462b3fd4a30","first_computed_at":"2026-07-05T00:25:28.021232Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:25:28.021232Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"R7DP6vgQ2G+wXWrKopsVuOfYeqpGSgjCS/2QT42M/wiTB3Kk/aiQJ8kJFL+BlqtTGDdr2EEXcY/ZRJU+qwpsBA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:25:28.021687Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.01953","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bea80744842d9594bb96f095a06575ff411c4bedfd9e99372d2f2e77d72e2b32","sha256:79f1b2ab63a1d1592ef4a53eebb84885a04318aabf7dd96129754665d1191043"],"state_sha256":"efd824c8b5e4bc6da26b075ecb8c5bd50054d96a4d365683373ff5dd83a6d2a0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+c52r2l/e0zwaLYr1C8SXHbA4Fl61lFR9u6xoSlQBn0swyMRo+kufsnlfO56sf1sUIsiAX0q9fQVE+zTCQnACw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T23:19:48.223249Z","bundle_sha256":"bcb4b0460c1742179a1599e94dcd0e4cff1af7d055ecb736badc104b6aa35035"}}