{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1998:PLEYCDWBC2PDPNW5W5QTFQBF3J","short_pith_number":"pith:PLEYCDWB","canonical_record":{"source":{"id":"astro-ph/9812022","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-12-01T19:43:00Z","cross_cats_sorted":["gr-qc","hep-ph"],"title_canon_sha256":"79bc022eb7a2656c2e161562c99b2a14406306d81b74c9128cffa21de54d7b53","abstract_canon_sha256":"256131b5fed1599a4fd3178af030359e31bde2dcd1ff74d79c6e2e979fcfd32c"},"schema_version":"1.0"},"canonical_sha256":"7ac9810ec1169e37b6ddb76132c025da6cbc73bf8b27f87304d1ecf9c12bef46","source":{"kind":"arxiv","id":"astro-ph/9812022","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9812022","created_at":"2026-07-04T15:45:43Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9812022v3","created_at":"2026-07-04T15:45:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9812022","created_at":"2026-07-04T15:45:43Z"},{"alias_kind":"pith_short_12","alias_value":"PLEYCDWBC2PD","created_at":"2026-07-04T15:45:43Z"},{"alias_kind":"pith_short_16","alias_value":"PLEYCDWBC2PDPNW5","created_at":"2026-07-04T15:45:43Z"},{"alias_kind":"pith_short_8","alias_value":"PLEYCDWB","created_at":"2026-07-04T15:45:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1998:PLEYCDWBC2PDPNW5W5QTFQBF3J","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9812022","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-12-01T19:43:00Z","cross_cats_sorted":["gr-qc","hep-ph"],"title_canon_sha256":"79bc022eb7a2656c2e161562c99b2a14406306d81b74c9128cffa21de54d7b53","abstract_canon_sha256":"256131b5fed1599a4fd3178af030359e31bde2dcd1ff74d79c6e2e979fcfd32c"},"schema_version":"1.0"},"canonical_sha256":"7ac9810ec1169e37b6ddb76132c025da6cbc73bf8b27f87304d1ecf9c12bef46","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:45:43.569333Z","signature_b64":"o4WmusF5eQ+E94oYqcOJkFQ0GwcsSgJE4p6RAan3dsSFpE43TQZG2rTA4VL1mfRg87z9Td7Xty1BdCVcIlxTDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7ac9810ec1169e37b6ddb76132c025da6cbc73bf8b27f87304d1ecf9c12bef46","last_reissued_at":"2026-07-04T15:45:43.568931Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:45:43.568931Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9812022","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T15:45:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oSsQUiEIYpeAM8Lxbs40Y1hpf/4gA6AOv4feq15HnwwN0M3+jcd6f6GkhuIOzgX4ASwX8SnhcDq7PsFilQXKDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-23T11:05:12.702577Z"},"content_sha256":"dad57466034141b62321520d0beef9133569bc2d0eaf6f95666bea13e85b1934","schema_version":"1.0","event_id":"sha256:dad57466034141b62321520d0beef9133569bc2d0eaf6f95666bea13e85b1934"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1998:PLEYCDWBC2PDPNW5W5QTFQBF3J","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Is the Dark Matter a Solid?","license":"","headline":"","cross_cats":["gr-qc","hep-ph"],"primary_cat":"astro-ph","authors_text":"Cambridge), David N. Spergel (Princeton), Martin Bucher (DAMTP","submitted_at":"1998-12-01T19:43:00Z","abstract_excerpt":"A smooth unclustered dark matter component with negative presure could reconcile a flat universe with the many observations that find a density in ordinary, clustered matter well below the critical density and also explain the recent high redshift supernova data suggesting that the expansion of the universe is now accelerating. For a perfect fluid negative presure leads to instabilities that are most severe on the shortest scales. However, if instead the dark matter is a solid, with an elastic resistance to pure shear deformations, an equation of state with negative presure can avoid these sho"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9812022","kind":"arxiv","version":3},"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/astro-ph/9812022/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":"2026-07-04T15:45:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N7dAR4rncl5IvnoQ4uETdivqJhy77Lgl3ndDQGezOdqY81lK/mpjyejqgo3GQ6Nq2k9R1/wf4zRq4Ms488X5Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-23T11:05:12.702939Z"},"content_sha256":"3b340fdde1e48f161181f9fda22d90f1684ef98c0022d679a5ea750f10d4f081","schema_version":"1.0","event_id":"sha256:3b340fdde1e48f161181f9fda22d90f1684ef98c0022d679a5ea750f10d4f081"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PLEYCDWBC2PDPNW5W5QTFQBF3J/bundle.json","state_url":"https://pith.science/pith/PLEYCDWBC2PDPNW5W5QTFQBF3J/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PLEYCDWBC2PDPNW5W5QTFQBF3J/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":"2026-07-23T11:05:12Z","links":{"resolver":"https://pith.science/pith/PLEYCDWBC2PDPNW5W5QTFQBF3J","bundle":"https://pith.science/pith/PLEYCDWBC2PDPNW5W5QTFQBF3J/bundle.json","state":"https://pith.science/pith/PLEYCDWBC2PDPNW5W5QTFQBF3J/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PLEYCDWBC2PDPNW5W5QTFQBF3J/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:PLEYCDWBC2PDPNW5W5QTFQBF3J","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":"256131b5fed1599a4fd3178af030359e31bde2dcd1ff74d79c6e2e979fcfd32c","cross_cats_sorted":["gr-qc","hep-ph"],"license":"","primary_cat":"astro-ph","submitted_at":"1998-12-01T19:43:00Z","title_canon_sha256":"79bc022eb7a2656c2e161562c99b2a14406306d81b74c9128cffa21de54d7b53"},"schema_version":"1.0","source":{"id":"astro-ph/9812022","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9812022","created_at":"2026-07-04T15:45:43Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9812022v3","created_at":"2026-07-04T15:45:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9812022","created_at":"2026-07-04T15:45:43Z"},{"alias_kind":"pith_short_12","alias_value":"PLEYCDWBC2PD","created_at":"2026-07-04T15:45:43Z"},{"alias_kind":"pith_short_16","alias_value":"PLEYCDWBC2PDPNW5","created_at":"2026-07-04T15:45:43Z"},{"alias_kind":"pith_short_8","alias_value":"PLEYCDWB","created_at":"2026-07-04T15:45:43Z"}],"graph_snapshots":[{"event_id":"sha256:3b340fdde1e48f161181f9fda22d90f1684ef98c0022d679a5ea750f10d4f081","target":"graph","created_at":"2026-07-04T15:45:43Z","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/astro-ph/9812022/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A smooth unclustered dark matter component with negative presure could reconcile a flat universe with the many observations that find a density in ordinary, clustered matter well below the critical density and also explain the recent high redshift supernova data suggesting that the expansion of the universe is now accelerating. For a perfect fluid negative presure leads to instabilities that are most severe on the shortest scales. However, if instead the dark matter is a solid, with an elastic resistance to pure shear deformations, an equation of state with negative presure can avoid these sho","authors_text":"Cambridge), David N. Spergel (Princeton), Martin Bucher (DAMTP","cross_cats":["gr-qc","hep-ph"],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1998-12-01T19:43:00Z","title":"Is the Dark Matter a Solid?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9812022","kind":"arxiv","version":3},"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:dad57466034141b62321520d0beef9133569bc2d0eaf6f95666bea13e85b1934","target":"record","created_at":"2026-07-04T15:45:43Z","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":"256131b5fed1599a4fd3178af030359e31bde2dcd1ff74d79c6e2e979fcfd32c","cross_cats_sorted":["gr-qc","hep-ph"],"license":"","primary_cat":"astro-ph","submitted_at":"1998-12-01T19:43:00Z","title_canon_sha256":"79bc022eb7a2656c2e161562c99b2a14406306d81b74c9128cffa21de54d7b53"},"schema_version":"1.0","source":{"id":"astro-ph/9812022","kind":"arxiv","version":3}},"canonical_sha256":"7ac9810ec1169e37b6ddb76132c025da6cbc73bf8b27f87304d1ecf9c12bef46","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7ac9810ec1169e37b6ddb76132c025da6cbc73bf8b27f87304d1ecf9c12bef46","first_computed_at":"2026-07-04T15:45:43.568931Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:45:43.568931Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"o4WmusF5eQ+E94oYqcOJkFQ0GwcsSgJE4p6RAan3dsSFpE43TQZG2rTA4VL1mfRg87z9Td7Xty1BdCVcIlxTDA==","signature_status":"signed_v1","signed_at":"2026-07-04T15:45:43.569333Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9812022","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dad57466034141b62321520d0beef9133569bc2d0eaf6f95666bea13e85b1934","sha256:3b340fdde1e48f161181f9fda22d90f1684ef98c0022d679a5ea750f10d4f081"],"state_sha256":"5f4dfee5e9ec50acfa3f0ae2c5314457cbae43e34e6baceee5961df901e4f131"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vQE/J01QqCtATI020kRUwVTcH8xag2jAihta/Q2XLak0zW6n60EUpCntTp+Fzs6qjHvaT8U4pmG5BCRLMYWAAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-23T11:05:12.705010Z","bundle_sha256":"dca30a866a7744bebc77f20aea984fa18c301bf3591dfa889d4ca4531cf49cd5"}}