{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:KRXPCLDQPWUTNY4WLMRBE6VMJJ","short_pith_number":"pith:KRXPCLDQ","canonical_record":{"source":{"id":"1502.01189","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-02-04T13:26:58Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"21d131389de4c847db39cd4f444cbc68eaf53aed5b7af6c113c756a0fed64d2d","abstract_canon_sha256":"97178e431a81fa4f508cab114d3a9e745cbe52e4c924b05a627a32596339a576"},"schema_version":"1.0"},"canonical_sha256":"546ef12c707da936e3965b22127aac4a7ed79c23dee99a520932dbcf20765daf","source":{"kind":"arxiv","id":"1502.01189","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.01189","created_at":"2026-05-18T02:19:52Z"},{"alias_kind":"arxiv_version","alias_value":"1502.01189v1","created_at":"2026-05-18T02:19:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.01189","created_at":"2026-05-18T02:19:52Z"},{"alias_kind":"pith_short_12","alias_value":"KRXPCLDQPWUT","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"KRXPCLDQPWUTNY4W","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"KRXPCLDQ","created_at":"2026-05-18T12:29:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:KRXPCLDQPWUTNY4WLMRBE6VMJJ","target":"record","payload":{"canonical_record":{"source":{"id":"1502.01189","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-02-04T13:26:58Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"21d131389de4c847db39cd4f444cbc68eaf53aed5b7af6c113c756a0fed64d2d","abstract_canon_sha256":"97178e431a81fa4f508cab114d3a9e745cbe52e4c924b05a627a32596339a576"},"schema_version":"1.0"},"canonical_sha256":"546ef12c707da936e3965b22127aac4a7ed79c23dee99a520932dbcf20765daf","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:19:52.317936Z","signature_b64":"rGml5ogocwN0AgriEkpYYGGC6J6zB6KEk9VVaK6nYFbTECtGPtH95uNbVS+e/InCtkl/8wfZ1KMlCJTCA/BYDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"546ef12c707da936e3965b22127aac4a7ed79c23dee99a520932dbcf20765daf","last_reissued_at":"2026-05-18T02:19:52.317359Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:19:52.317359Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1502.01189","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":"2026-05-18T02:19:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aKKVRajbFGHZg6wbVS5Vytxe1SS+rXSn0A3tS09CcN8GV6XS2s4uQ/X1VxvjKo6yuZdQWXkNA9JdpDX9lKf4Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T21:53:18.863122Z"},"content_sha256":"3aca9a8ee1b30c13582cb49a15c960d26facd3169b773404832a92a6dbf7c521","schema_version":"1.0","event_id":"sha256:3aca9a8ee1b30c13582cb49a15c960d26facd3169b773404832a92a6dbf7c521"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:KRXPCLDQPWUTNY4WLMRBE6VMJJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The universe dominated by the extended Chaplygin gas","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"B. Pourhassan, E.O. Kahya","submitted_at":"2015-02-04T13:26:58Z","abstract_excerpt":"In this paper, we consider a universe dominated by the extended Chaplygin gas which recently proposed as the last version of Chaplygin gas models. Here, we only consider the second order term which recovers quadratic barotropic fluid equation of state. The density perturbations analyzed in both relativistic and Newtonian regimes and show that the model is stable without any phase transition and critical point. We confirmed stability of the model using thermodynamics point of view."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.01189","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":"2026-05-18T02:19:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"17WxhGKPDi+9NFojuLLfAFUPGSbNHfUL5qejTeHUO+8SiewCiErLk4SxGFwWnY6giptM/S++yfUfsDVavioABw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T21:53:18.863481Z"},"content_sha256":"95a61aa8c6d6a2d9349872195889897de7dc5972c36f48c849739201fca1174c","schema_version":"1.0","event_id":"sha256:95a61aa8c6d6a2d9349872195889897de7dc5972c36f48c849739201fca1174c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KRXPCLDQPWUTNY4WLMRBE6VMJJ/bundle.json","state_url":"https://pith.science/pith/KRXPCLDQPWUTNY4WLMRBE6VMJJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KRXPCLDQPWUTNY4WLMRBE6VMJJ/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":"2026-06-08T21:53:18Z","links":{"resolver":"https://pith.science/pith/KRXPCLDQPWUTNY4WLMRBE6VMJJ","bundle":"https://pith.science/pith/KRXPCLDQPWUTNY4WLMRBE6VMJJ/bundle.json","state":"https://pith.science/pith/KRXPCLDQPWUTNY4WLMRBE6VMJJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KRXPCLDQPWUTNY4WLMRBE6VMJJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:KRXPCLDQPWUTNY4WLMRBE6VMJJ","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":"97178e431a81fa4f508cab114d3a9e745cbe52e4c924b05a627a32596339a576","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-02-04T13:26:58Z","title_canon_sha256":"21d131389de4c847db39cd4f444cbc68eaf53aed5b7af6c113c756a0fed64d2d"},"schema_version":"1.0","source":{"id":"1502.01189","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.01189","created_at":"2026-05-18T02:19:52Z"},{"alias_kind":"arxiv_version","alias_value":"1502.01189v1","created_at":"2026-05-18T02:19:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.01189","created_at":"2026-05-18T02:19:52Z"},{"alias_kind":"pith_short_12","alias_value":"KRXPCLDQPWUT","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"KRXPCLDQPWUTNY4W","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"KRXPCLDQ","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:95a61aa8c6d6a2d9349872195889897de7dc5972c36f48c849739201fca1174c","target":"graph","created_at":"2026-05-18T02:19:52Z","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":"In this paper, we consider a universe dominated by the extended Chaplygin gas which recently proposed as the last version of Chaplygin gas models. Here, we only consider the second order term which recovers quadratic barotropic fluid equation of state. The density perturbations analyzed in both relativistic and Newtonian regimes and show that the model is stable without any phase transition and critical point. We confirmed stability of the model using thermodynamics point of view.","authors_text":"B. Pourhassan, E.O. Kahya","cross_cats":["hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-02-04T13:26:58Z","title":"The universe dominated by the extended Chaplygin gas"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.01189","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":"sha256:3aca9a8ee1b30c13582cb49a15c960d26facd3169b773404832a92a6dbf7c521","target":"record","created_at":"2026-05-18T02:19:52Z","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":"97178e431a81fa4f508cab114d3a9e745cbe52e4c924b05a627a32596339a576","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-02-04T13:26:58Z","title_canon_sha256":"21d131389de4c847db39cd4f444cbc68eaf53aed5b7af6c113c756a0fed64d2d"},"schema_version":"1.0","source":{"id":"1502.01189","kind":"arxiv","version":1}},"canonical_sha256":"546ef12c707da936e3965b22127aac4a7ed79c23dee99a520932dbcf20765daf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"546ef12c707da936e3965b22127aac4a7ed79c23dee99a520932dbcf20765daf","first_computed_at":"2026-05-18T02:19:52.317359Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:19:52.317359Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rGml5ogocwN0AgriEkpYYGGC6J6zB6KEk9VVaK6nYFbTECtGPtH95uNbVS+e/InCtkl/8wfZ1KMlCJTCA/BYDA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:19:52.317936Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.01189","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3aca9a8ee1b30c13582cb49a15c960d26facd3169b773404832a92a6dbf7c521","sha256:95a61aa8c6d6a2d9349872195889897de7dc5972c36f48c849739201fca1174c"],"state_sha256":"1f486d1351e019bbe10775411c02fdc85850d838d0de4996e6931daf6dc5913a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2RlFVg/xj3OSRSPegOvfu//HdCmrD8y9ycJuXLNCXlFtM6p/b3MUVYf0UbcHkk/7/AggTEu5cyXpQXel3mFXDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T21:53:18.865365Z","bundle_sha256":"a3194a29da1614a9bc837d9132d204aca42e4609ba209af03a9336f5abccb27b"}}