{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:RHFI7JPMX2Y5B6EWZB2OIVFC2A","short_pith_number":"pith:RHFI7JPM","canonical_record":{"source":{"id":"1311.1857","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-11-08T00:53:15Z","cross_cats_sorted":[],"title_canon_sha256":"b337fffa2c5438ae61ae78b799ed33cdec0afad126830f8895d4fc0111d5f0e5","abstract_canon_sha256":"652db0c6dba6074091dc2a503fb8f58ddef660bf2c6758dbc0d3fc14c9737d4b"},"schema_version":"1.0"},"canonical_sha256":"89ca8fa5ecbeb1d0f896c874e454a2d00eed067d0f04131c365bf7aa8c720a1c","source":{"kind":"arxiv","id":"1311.1857","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.1857","created_at":"2026-05-18T01:37:05Z"},{"alias_kind":"arxiv_version","alias_value":"1311.1857v1","created_at":"2026-05-18T01:37:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.1857","created_at":"2026-05-18T01:37:05Z"},{"alias_kind":"pith_short_12","alias_value":"RHFI7JPMX2Y5","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_16","alias_value":"RHFI7JPMX2Y5B6EW","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_8","alias_value":"RHFI7JPM","created_at":"2026-05-18T12:27:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:RHFI7JPMX2Y5B6EWZB2OIVFC2A","target":"record","payload":{"canonical_record":{"source":{"id":"1311.1857","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-11-08T00:53:15Z","cross_cats_sorted":[],"title_canon_sha256":"b337fffa2c5438ae61ae78b799ed33cdec0afad126830f8895d4fc0111d5f0e5","abstract_canon_sha256":"652db0c6dba6074091dc2a503fb8f58ddef660bf2c6758dbc0d3fc14c9737d4b"},"schema_version":"1.0"},"canonical_sha256":"89ca8fa5ecbeb1d0f896c874e454a2d00eed067d0f04131c365bf7aa8c720a1c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:37:05.905163Z","signature_b64":"QIAQXl+5I/6/QFHW/gX6cyMkdopZ/iMROdc8sCIrsU0Ecek/cCdfv9MlFFz0IaukIP/nWMPyDddokizb8tARBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"89ca8fa5ecbeb1d0f896c874e454a2d00eed067d0f04131c365bf7aa8c720a1c","last_reissued_at":"2026-05-18T01:37:05.904468Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:37:05.904468Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1311.1857","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":"2026-05-18T01:37:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zYyWA6AqrBpLn7Rx+T6ozrR/E/SBW5PFscqN6d45cJDnMcuwxF2pdoS1mXK1+1CN3HqBQuxAzhs6tYEXvZ4GAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T12:51:58.944126Z"},"content_sha256":"eaa7616b0655e538453a88ca1030daa3ac5fcef8554cc8f1afca809a325b5980","schema_version":"1.0","event_id":"sha256:eaa7616b0655e538453a88ca1030daa3ac5fcef8554cc8f1afca809a325b5980"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:RHFI7JPMX2Y5B6EWZB2OIVFC2A","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"General relativistic density perturbations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Alan Coley, Woei Chet Lim","submitted_at":"2013-11-08T00:53:15Z","abstract_excerpt":"We investigate a general relativistic mechanism in which spikes generate matter overdensities in the early universe. When the cosmological fluid is tilted, the tilt provides another mechanism in generating matter inhomogeneities. We numerically investigate the effect of a sign change in the tilt, when there is a spike but the tilt does not change sign, and when the spike and the sign change in the tilt coincide. We find that the tilt plays the primary role in generating matter inhomogeneities, and it does so by creating both local overdensities and underdensities. We discuss of the physical im"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.1857","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":"2026-05-18T01:37:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"b97uwTTANgyCgZE/0vo/SMQJZoiUikEKhZJ+EoQt8yOS4DpLIyixANPoFVQeMJiAGtCkVcC1zPBHJNlrE+MZBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T12:51:58.944484Z"},"content_sha256":"79d89668376077da56ee9527998142fd7ea7e314ea3dc35f2ff1976e2af5088e","schema_version":"1.0","event_id":"sha256:79d89668376077da56ee9527998142fd7ea7e314ea3dc35f2ff1976e2af5088e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RHFI7JPMX2Y5B6EWZB2OIVFC2A/bundle.json","state_url":"https://pith.science/pith/RHFI7JPMX2Y5B6EWZB2OIVFC2A/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RHFI7JPMX2Y5B6EWZB2OIVFC2A/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":"2026-06-06T12:51:58Z","links":{"resolver":"https://pith.science/pith/RHFI7JPMX2Y5B6EWZB2OIVFC2A","bundle":"https://pith.science/pith/RHFI7JPMX2Y5B6EWZB2OIVFC2A/bundle.json","state":"https://pith.science/pith/RHFI7JPMX2Y5B6EWZB2OIVFC2A/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RHFI7JPMX2Y5B6EWZB2OIVFC2A/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:RHFI7JPMX2Y5B6EWZB2OIVFC2A","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":"652db0c6dba6074091dc2a503fb8f58ddef660bf2c6758dbc0d3fc14c9737d4b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-11-08T00:53:15Z","title_canon_sha256":"b337fffa2c5438ae61ae78b799ed33cdec0afad126830f8895d4fc0111d5f0e5"},"schema_version":"1.0","source":{"id":"1311.1857","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.1857","created_at":"2026-05-18T01:37:05Z"},{"alias_kind":"arxiv_version","alias_value":"1311.1857v1","created_at":"2026-05-18T01:37:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.1857","created_at":"2026-05-18T01:37:05Z"},{"alias_kind":"pith_short_12","alias_value":"RHFI7JPMX2Y5","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_16","alias_value":"RHFI7JPMX2Y5B6EW","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_8","alias_value":"RHFI7JPM","created_at":"2026-05-18T12:27:57Z"}],"graph_snapshots":[{"event_id":"sha256:79d89668376077da56ee9527998142fd7ea7e314ea3dc35f2ff1976e2af5088e","target":"graph","created_at":"2026-05-18T01:37:05Z","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":"We investigate a general relativistic mechanism in which spikes generate matter overdensities in the early universe. When the cosmological fluid is tilted, the tilt provides another mechanism in generating matter inhomogeneities. We numerically investigate the effect of a sign change in the tilt, when there is a spike but the tilt does not change sign, and when the spike and the sign change in the tilt coincide. We find that the tilt plays the primary role in generating matter inhomogeneities, and it does so by creating both local overdensities and underdensities. We discuss of the physical im","authors_text":"Alan Coley, Woei Chet Lim","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-11-08T00:53:15Z","title":"General relativistic density perturbations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.1857","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:eaa7616b0655e538453a88ca1030daa3ac5fcef8554cc8f1afca809a325b5980","target":"record","created_at":"2026-05-18T01:37:05Z","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":"652db0c6dba6074091dc2a503fb8f58ddef660bf2c6758dbc0d3fc14c9737d4b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-11-08T00:53:15Z","title_canon_sha256":"b337fffa2c5438ae61ae78b799ed33cdec0afad126830f8895d4fc0111d5f0e5"},"schema_version":"1.0","source":{"id":"1311.1857","kind":"arxiv","version":1}},"canonical_sha256":"89ca8fa5ecbeb1d0f896c874e454a2d00eed067d0f04131c365bf7aa8c720a1c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"89ca8fa5ecbeb1d0f896c874e454a2d00eed067d0f04131c365bf7aa8c720a1c","first_computed_at":"2026-05-18T01:37:05.904468Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:37:05.904468Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QIAQXl+5I/6/QFHW/gX6cyMkdopZ/iMROdc8sCIrsU0Ecek/cCdfv9MlFFz0IaukIP/nWMPyDddokizb8tARBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:37:05.905163Z","signed_message":"canonical_sha256_bytes"},"source_id":"1311.1857","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eaa7616b0655e538453a88ca1030daa3ac5fcef8554cc8f1afca809a325b5980","sha256:79d89668376077da56ee9527998142fd7ea7e314ea3dc35f2ff1976e2af5088e"],"state_sha256":"aa4e31350187076dfd0ef46439064e0ff4ffa5fef4e1778554690f3e52105e59"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Z8znL5kK3EYZI+l7+oHZtWjPgo19VYQGig9OkJhBxL3PpKzZBQpgFW8GYkXU/6tP4VKrh9WY+3nH0+nD+nSmAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T12:51:58.946693Z","bundle_sha256":"58898a3da6cfa39dfcf9788dcbbfa7dd9d2026f35575886898cec24837d18486"}}