{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:37PE7NQ5YPRW6EWSB4YMJWH6TA","short_pith_number":"pith:37PE7NQ5","canonical_record":{"source":{"id":"1504.00366","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-04-01T20:00:45Z","cross_cats_sorted":[],"title_canon_sha256":"c2266950c2a7249e5f749f3d991b58c73a0f29213d313ee86590bffb70a96bae","abstract_canon_sha256":"037dfdc84ae6af6dfe21d2c888470479e0a46a5c3ab78f92991d4e5666b3a669"},"schema_version":"1.0"},"canonical_sha256":"dfde4fb61dc3e36f12d20f30c4d8fe983c2a6631ab94dff6b4590893d2b47e88","source":{"kind":"arxiv","id":"1504.00366","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.00366","created_at":"2026-05-18T01:30:24Z"},{"alias_kind":"arxiv_version","alias_value":"1504.00366v2","created_at":"2026-05-18T01:30:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.00366","created_at":"2026-05-18T01:30:24Z"},{"alias_kind":"pith_short_12","alias_value":"37PE7NQ5YPRW","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"37PE7NQ5YPRW6EWS","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"37PE7NQ5","created_at":"2026-05-18T12:29:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:37PE7NQ5YPRW6EWSB4YMJWH6TA","target":"record","payload":{"canonical_record":{"source":{"id":"1504.00366","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-04-01T20:00:45Z","cross_cats_sorted":[],"title_canon_sha256":"c2266950c2a7249e5f749f3d991b58c73a0f29213d313ee86590bffb70a96bae","abstract_canon_sha256":"037dfdc84ae6af6dfe21d2c888470479e0a46a5c3ab78f92991d4e5666b3a669"},"schema_version":"1.0"},"canonical_sha256":"dfde4fb61dc3e36f12d20f30c4d8fe983c2a6631ab94dff6b4590893d2b47e88","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:30:24.919289Z","signature_b64":"G+zLYn8gXGsedtuME3ZuG3imBVpm1y6RAqK+S9mlwnb7IViiXu9l3amn+FDY/xO9lXnV0hTt1m1+oR/SGVG0BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dfde4fb61dc3e36f12d20f30c4d8fe983c2a6631ab94dff6b4590893d2b47e88","last_reissued_at":"2026-05-18T01:30:24.918645Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:30:24.918645Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1504.00366","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":"2026-05-18T01:30:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z2A9f7r7dPXe41U6hr9feQ23ZyzYSZ1TUeUjgkZ8dQzlWMoadlEFbDNiM/34fx4DUdxgXfQ0iUHQn8ejwAOHDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:09:54.548667Z"},"content_sha256":"bbd30772efa6def492f03cc07b505c20aea3d5fdcaf29632b5592e4cc022b688","schema_version":"1.0","event_id":"sha256:bbd30772efa6def492f03cc07b505c20aea3d5fdcaf29632b5592e4cc022b688"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:37PE7NQ5YPRW6EWSB4YMJWH6TA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Characterizing the Pressure Smoothing Scale of the Intergalactic Medium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Alberto Rorai, Girish Kulkarni, Jose O\\~norbe, Joseph F. Hennawi, Volker Springel","submitted_at":"2015-04-01T20:00:45Z","abstract_excerpt":"The thermal state of the intergalactic medium (IGM) at z < 6 constrains the nature and timing of cosmic reionization events, but its inference from the Ly-alpha forest is degenerate with the 3-D structure of the IGM on ~100 kpc scales, where, analogous to the classical Jeans argument, the pressure of the T~$10^4$ K gas supports it against gravity. We simulate the IGM using smoothed particle hydrodynamics, and find that, at z < 6, the gas density power spectrum does not exhibit the expected Jeans filtering cutoff, because dense gas in collapsed halos dominates the small-scale power masking pres"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.00366","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":""},"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":"2026-05-18T01:30:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XG/uLox5SDhJ0MqMFmWhcnGB1sUzqdj6qdJefnZV0YhayTv2UFBwIFOomhKo9YyQTGL/ObXZ/EWjnid376VDBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:09:54.549234Z"},"content_sha256":"3b4be9f17530f3941d4448c08e03737df7f0397787fa3638c953316fd5de16f6","schema_version":"1.0","event_id":"sha256:3b4be9f17530f3941d4448c08e03737df7f0397787fa3638c953316fd5de16f6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/37PE7NQ5YPRW6EWSB4YMJWH6TA/bundle.json","state_url":"https://pith.science/pith/37PE7NQ5YPRW6EWSB4YMJWH6TA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/37PE7NQ5YPRW6EWSB4YMJWH6TA/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":"2026-05-26T22:09:54Z","links":{"resolver":"https://pith.science/pith/37PE7NQ5YPRW6EWSB4YMJWH6TA","bundle":"https://pith.science/pith/37PE7NQ5YPRW6EWSB4YMJWH6TA/bundle.json","state":"https://pith.science/pith/37PE7NQ5YPRW6EWSB4YMJWH6TA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/37PE7NQ5YPRW6EWSB4YMJWH6TA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:37PE7NQ5YPRW6EWSB4YMJWH6TA","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":"037dfdc84ae6af6dfe21d2c888470479e0a46a5c3ab78f92991d4e5666b3a669","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-04-01T20:00:45Z","title_canon_sha256":"c2266950c2a7249e5f749f3d991b58c73a0f29213d313ee86590bffb70a96bae"},"schema_version":"1.0","source":{"id":"1504.00366","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.00366","created_at":"2026-05-18T01:30:24Z"},{"alias_kind":"arxiv_version","alias_value":"1504.00366v2","created_at":"2026-05-18T01:30:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.00366","created_at":"2026-05-18T01:30:24Z"},{"alias_kind":"pith_short_12","alias_value":"37PE7NQ5YPRW","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"37PE7NQ5YPRW6EWS","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"37PE7NQ5","created_at":"2026-05-18T12:29:02Z"}],"graph_snapshots":[{"event_id":"sha256:3b4be9f17530f3941d4448c08e03737df7f0397787fa3638c953316fd5de16f6","target":"graph","created_at":"2026-05-18T01:30:24Z","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 thermal state of the intergalactic medium (IGM) at z < 6 constrains the nature and timing of cosmic reionization events, but its inference from the Ly-alpha forest is degenerate with the 3-D structure of the IGM on ~100 kpc scales, where, analogous to the classical Jeans argument, the pressure of the T~$10^4$ K gas supports it against gravity. We simulate the IGM using smoothed particle hydrodynamics, and find that, at z < 6, the gas density power spectrum does not exhibit the expected Jeans filtering cutoff, because dense gas in collapsed halos dominates the small-scale power masking pres","authors_text":"Alberto Rorai, Girish Kulkarni, Jose O\\~norbe, Joseph F. Hennawi, Volker Springel","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-04-01T20:00:45Z","title":"Characterizing the Pressure Smoothing Scale of the Intergalactic Medium"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.00366","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:bbd30772efa6def492f03cc07b505c20aea3d5fdcaf29632b5592e4cc022b688","target":"record","created_at":"2026-05-18T01:30:24Z","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":"037dfdc84ae6af6dfe21d2c888470479e0a46a5c3ab78f92991d4e5666b3a669","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-04-01T20:00:45Z","title_canon_sha256":"c2266950c2a7249e5f749f3d991b58c73a0f29213d313ee86590bffb70a96bae"},"schema_version":"1.0","source":{"id":"1504.00366","kind":"arxiv","version":2}},"canonical_sha256":"dfde4fb61dc3e36f12d20f30c4d8fe983c2a6631ab94dff6b4590893d2b47e88","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dfde4fb61dc3e36f12d20f30c4d8fe983c2a6631ab94dff6b4590893d2b47e88","first_computed_at":"2026-05-18T01:30:24.918645Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:30:24.918645Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"G+zLYn8gXGsedtuME3ZuG3imBVpm1y6RAqK+S9mlwnb7IViiXu9l3amn+FDY/xO9lXnV0hTt1m1+oR/SGVG0BA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:30:24.919289Z","signed_message":"canonical_sha256_bytes"},"source_id":"1504.00366","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bbd30772efa6def492f03cc07b505c20aea3d5fdcaf29632b5592e4cc022b688","sha256:3b4be9f17530f3941d4448c08e03737df7f0397787fa3638c953316fd5de16f6"],"state_sha256":"b0bb0932de01540e330c718629666bc5bbb370faf39382417fb9d1559c63fc26"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0BNqAY3c4unYAgsMWSw5goknoiRp5z5OKZ/elnlDrYcighnRbLYyXcZdFlld2a64FjxXIqAqPub+yFabxEznBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T22:09:54.552009Z","bundle_sha256":"c75342080cfcb41f5e1a020c4494ab017206781650c36fc5ccc2a0b4b7e92701"}}