{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:V6CB6FTJJJ4AH6INWKBE5YDYRK","short_pith_number":"pith:V6CB6FTJ","canonical_record":{"source":{"id":"1011.0286","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-11-01T10:49:15Z","cross_cats_sorted":["gr-qc","hep-th"],"title_canon_sha256":"183082613e90099542175b575ee4bf83596a413e924e8f409f7f90cb3f2f1bda","abstract_canon_sha256":"c8aaa0f73fe0b0d990036d6b66cec99764523c941fa27185486e178493a14b20"},"schema_version":"1.0"},"canonical_sha256":"af841f16694a7803f90db2824ee0788a81b3f06b6693e6c1b9401785eec7fbe0","source":{"kind":"arxiv","id":"1011.0286","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1011.0286","created_at":"2026-05-18T02:23:37Z"},{"alias_kind":"arxiv_version","alias_value":"1011.0286v3","created_at":"2026-05-18T02:23:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1011.0286","created_at":"2026-05-18T02:23:37Z"},{"alias_kind":"pith_short_12","alias_value":"V6CB6FTJJJ4A","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"V6CB6FTJJJ4AH6IN","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"V6CB6FTJ","created_at":"2026-05-18T12:26:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:V6CB6FTJJJ4AH6INWKBE5YDYRK","target":"record","payload":{"canonical_record":{"source":{"id":"1011.0286","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-11-01T10:49:15Z","cross_cats_sorted":["gr-qc","hep-th"],"title_canon_sha256":"183082613e90099542175b575ee4bf83596a413e924e8f409f7f90cb3f2f1bda","abstract_canon_sha256":"c8aaa0f73fe0b0d990036d6b66cec99764523c941fa27185486e178493a14b20"},"schema_version":"1.0"},"canonical_sha256":"af841f16694a7803f90db2824ee0788a81b3f06b6693e6c1b9401785eec7fbe0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:23:37.973250Z","signature_b64":"2Wza9fAVLkmqW3+F/J0Lc84GW1UFfZOzEXOLtZGMcen10/WtpVrxtJieHIBg5OoQJEq0ghFVRfkGXFFthS5zBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"af841f16694a7803f90db2824ee0788a81b3f06b6693e6c1b9401785eec7fbe0","last_reissued_at":"2026-05-18T02:23:37.972743Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:23:37.972743Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1011.0286","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":"2026-05-18T02:23:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lJsPE3FVKBwBQVW4AiaNjZjoDWmaHNnx3SLE19BMnhfxmICSpM6Yo4SdwArGy14CKfMvYj7qe87MKoXLyEQQBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T18:45:26.185912Z"},"content_sha256":"10b95cf66da2b394bd686e1d49fd0e2d866ac00ba53764a14a0276ddfc9573dc","schema_version":"1.0","event_id":"sha256:10b95cf66da2b394bd686e1d49fd0e2d866ac00ba53764a14a0276ddfc9573dc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:V6CB6FTJJJ4AH6INWKBE5YDYRK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Scalar models for the generalized Chaplygin gas and the structure formation constraints","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc","hep-th"],"primary_cat":"astro-ph.CO","authors_text":"J.C. Fabris, M. Hamani Daouda, O.F. Piattella, T.C.C. Guio","submitted_at":"2010-11-01T10:49:15Z","abstract_excerpt":"The generalized Chaplygin gas model represents an attempt to unify dark matter and dark energy. It is characterized by a fluid with an equation of state $p = - A/\\rho^\\alpha$. It can be obtained from a generalization of the DBI action for a scalar, tachyonic field. At background level, this model gives very good results, but it suffers from many drawbacks at perturbative level. We show that, while for background analysis it is possible to consider any value for $\\alpha$, the perturbative analysis must be restricted to positive values of $\\alpha$. This restriction can be circumvented if the ori"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.0286","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":""},"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":"2026-05-18T02:23:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Eg4k/2qN7Zpnslm8fL5rjbNFXcn8FkZVw99WHkPCSV8xwJIytaE6dudcmXQdic3MymlUsHTgTSahro9E4bQaDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T18:45:26.186613Z"},"content_sha256":"4f3cd7949b549c07c510a6ad2c077202ab98248e24115e3ee121df4bbf767182","schema_version":"1.0","event_id":"sha256:4f3cd7949b549c07c510a6ad2c077202ab98248e24115e3ee121df4bbf767182"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/V6CB6FTJJJ4AH6INWKBE5YDYRK/bundle.json","state_url":"https://pith.science/pith/V6CB6FTJJJ4AH6INWKBE5YDYRK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/V6CB6FTJJJ4AH6INWKBE5YDYRK/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":"2026-05-28T18:45:26Z","links":{"resolver":"https://pith.science/pith/V6CB6FTJJJ4AH6INWKBE5YDYRK","bundle":"https://pith.science/pith/V6CB6FTJJJ4AH6INWKBE5YDYRK/bundle.json","state":"https://pith.science/pith/V6CB6FTJJJ4AH6INWKBE5YDYRK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/V6CB6FTJJJ4AH6INWKBE5YDYRK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:V6CB6FTJJJ4AH6INWKBE5YDYRK","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":"c8aaa0f73fe0b0d990036d6b66cec99764523c941fa27185486e178493a14b20","cross_cats_sorted":["gr-qc","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-11-01T10:49:15Z","title_canon_sha256":"183082613e90099542175b575ee4bf83596a413e924e8f409f7f90cb3f2f1bda"},"schema_version":"1.0","source":{"id":"1011.0286","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1011.0286","created_at":"2026-05-18T02:23:37Z"},{"alias_kind":"arxiv_version","alias_value":"1011.0286v3","created_at":"2026-05-18T02:23:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1011.0286","created_at":"2026-05-18T02:23:37Z"},{"alias_kind":"pith_short_12","alias_value":"V6CB6FTJJJ4A","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"V6CB6FTJJJ4AH6IN","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"V6CB6FTJ","created_at":"2026-05-18T12:26:15Z"}],"graph_snapshots":[{"event_id":"sha256:4f3cd7949b549c07c510a6ad2c077202ab98248e24115e3ee121df4bbf767182","target":"graph","created_at":"2026-05-18T02:23:37Z","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":"The generalized Chaplygin gas model represents an attempt to unify dark matter and dark energy. It is characterized by a fluid with an equation of state $p = - A/\\rho^\\alpha$. It can be obtained from a generalization of the DBI action for a scalar, tachyonic field. At background level, this model gives very good results, but it suffers from many drawbacks at perturbative level. We show that, while for background analysis it is possible to consider any value for $\\alpha$, the perturbative analysis must be restricted to positive values of $\\alpha$. This restriction can be circumvented if the ori","authors_text":"J.C. Fabris, M. Hamani Daouda, O.F. Piattella, T.C.C. Guio","cross_cats":["gr-qc","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-11-01T10:49:15Z","title":"Scalar models for the generalized Chaplygin gas and the structure formation constraints"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.0286","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":"sha256:10b95cf66da2b394bd686e1d49fd0e2d866ac00ba53764a14a0276ddfc9573dc","target":"record","created_at":"2026-05-18T02:23:37Z","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":"c8aaa0f73fe0b0d990036d6b66cec99764523c941fa27185486e178493a14b20","cross_cats_sorted":["gr-qc","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-11-01T10:49:15Z","title_canon_sha256":"183082613e90099542175b575ee4bf83596a413e924e8f409f7f90cb3f2f1bda"},"schema_version":"1.0","source":{"id":"1011.0286","kind":"arxiv","version":3}},"canonical_sha256":"af841f16694a7803f90db2824ee0788a81b3f06b6693e6c1b9401785eec7fbe0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"af841f16694a7803f90db2824ee0788a81b3f06b6693e6c1b9401785eec7fbe0","first_computed_at":"2026-05-18T02:23:37.972743Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:23:37.972743Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2Wza9fAVLkmqW3+F/J0Lc84GW1UFfZOzEXOLtZGMcen10/WtpVrxtJieHIBg5OoQJEq0ghFVRfkGXFFthS5zBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:23:37.973250Z","signed_message":"canonical_sha256_bytes"},"source_id":"1011.0286","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:10b95cf66da2b394bd686e1d49fd0e2d866ac00ba53764a14a0276ddfc9573dc","sha256:4f3cd7949b549c07c510a6ad2c077202ab98248e24115e3ee121df4bbf767182"],"state_sha256":"77935cac39835e0d51a0d116c2e28d37ccd13eb163cfcada761fa94096c3c6e6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EAMb3ENOFIcPISNHXx7Cgi+XMmsmYz4wH6zFAUYR29hbg7DNF/jC+p9bsZrz1VZp9tZFwTEP04rT9oxWL0y/Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T18:45:26.190204Z","bundle_sha256":"059a29034cefe72d009eefed288f09a14b4504c6c52768c8ebab5cab93ce9398"}}