{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:A7OHFO5MEEG7OMKNKVS4CWUHWX","short_pith_number":"pith:A7OHFO5M","canonical_record":{"source":{"id":"1209.2118","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-10T20:00:01Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"5475b7999ca1940f4c90642d2200429a995fcc98c91c93a581dc3d4de841fe40","abstract_canon_sha256":"9f683f7aa77aa30add00322172df4e6d6d80ad487de5542ca0f71449c67be1b6"},"schema_version":"1.0"},"canonical_sha256":"07dc72bbac210df7314d5565c15a87b5c6478233ce84208664d671b90028121c","source":{"kind":"arxiv","id":"1209.2118","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.2118","created_at":"2026-05-18T02:29:45Z"},{"alias_kind":"arxiv_version","alias_value":"1209.2118v2","created_at":"2026-05-18T02:29:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.2118","created_at":"2026-05-18T02:29:45Z"},{"alias_kind":"pith_short_12","alias_value":"A7OHFO5MEEG7","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"A7OHFO5MEEG7OMKN","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"A7OHFO5M","created_at":"2026-05-18T12:26:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:A7OHFO5MEEG7OMKNKVS4CWUHWX","target":"record","payload":{"canonical_record":{"source":{"id":"1209.2118","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-10T20:00:01Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"5475b7999ca1940f4c90642d2200429a995fcc98c91c93a581dc3d4de841fe40","abstract_canon_sha256":"9f683f7aa77aa30add00322172df4e6d6d80ad487de5542ca0f71449c67be1b6"},"schema_version":"1.0"},"canonical_sha256":"07dc72bbac210df7314d5565c15a87b5c6478233ce84208664d671b90028121c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:29:45.812975Z","signature_b64":"CM+hdGDBSyLVCdROdoiG4e1ZiSCXXqn1F3hVWxQIkQRvpDpAzUfUFgmzhCwNRrBQIqf+PlAmJQY0vp67RCkUCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"07dc72bbac210df7314d5565c15a87b5c6478233ce84208664d671b90028121c","last_reissued_at":"2026-05-18T02:29:45.812167Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:29:45.812167Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1209.2118","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":"2026-05-18T02:29:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PzzPIZBZO0nxzgQKhB711CreoNNM1p2igflBFSsd3ZNr6k1Jo0hC4VFSF+5nk77UR9kswYUmkio+cfehSQU9Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T12:12:58.980199Z"},"content_sha256":"99ca451566b022c1f93db0f2af8af5b6dba47af34dc4228234d93fe947194d5d","schema_version":"1.0","event_id":"sha256:99ca451566b022c1f93db0f2af8af5b6dba47af34dc4228234d93fe947194d5d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:A7OHFO5MEEG7OMKNKVS4CWUHWX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Moving mesh cosmology: properties of neutral hydrogen in absorption","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"Debora Sijacki, Lars Hernquist, Mark Vogelsberger, Matias Zaldarriaga, Simeon Bird, Volker Springel","submitted_at":"2012-09-10T20:00:01Z","abstract_excerpt":"We examine the distribution of neutral hydrogen in cosmological simulations carried out with the new moving-mesh code AREPO and compare it with the corresponding GADGET simulations based on the smoothed particle hydrodynamics (SPH) technique. The two codes use identical gravity solvers and baryonic physics implementations, but very different methods for solving the Euler equations, allowing us to assess how numerical effects associated with the hydro-solver impact the results of simulations. Here we focus on an analysis of the neutral gas, as detected in quasar absorption lines. We find that t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.2118","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":"2026-05-18T02:29:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4dfMcTHr1o0NqzloBf8ZAUbEYhIKmPggNsasGnJ3WENbggP+Gyamb+RtReOPqCFLdQ491biR6KDUR7SyWwGYCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T12:12:58.980571Z"},"content_sha256":"d7009481ac251f9f537b69d7ded27a08f3b708b9122dc0a04fdda95dbb0ad1c4","schema_version":"1.0","event_id":"sha256:d7009481ac251f9f537b69d7ded27a08f3b708b9122dc0a04fdda95dbb0ad1c4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/A7OHFO5MEEG7OMKNKVS4CWUHWX/bundle.json","state_url":"https://pith.science/pith/A7OHFO5MEEG7OMKNKVS4CWUHWX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/A7OHFO5MEEG7OMKNKVS4CWUHWX/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":"2026-05-30T12:12:58Z","links":{"resolver":"https://pith.science/pith/A7OHFO5MEEG7OMKNKVS4CWUHWX","bundle":"https://pith.science/pith/A7OHFO5MEEG7OMKNKVS4CWUHWX/bundle.json","state":"https://pith.science/pith/A7OHFO5MEEG7OMKNKVS4CWUHWX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/A7OHFO5MEEG7OMKNKVS4CWUHWX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:A7OHFO5MEEG7OMKNKVS4CWUHWX","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":"9f683f7aa77aa30add00322172df4e6d6d80ad487de5542ca0f71449c67be1b6","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-10T20:00:01Z","title_canon_sha256":"5475b7999ca1940f4c90642d2200429a995fcc98c91c93a581dc3d4de841fe40"},"schema_version":"1.0","source":{"id":"1209.2118","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.2118","created_at":"2026-05-18T02:29:45Z"},{"alias_kind":"arxiv_version","alias_value":"1209.2118v2","created_at":"2026-05-18T02:29:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.2118","created_at":"2026-05-18T02:29:45Z"},{"alias_kind":"pith_short_12","alias_value":"A7OHFO5MEEG7","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"A7OHFO5MEEG7OMKN","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"A7OHFO5M","created_at":"2026-05-18T12:26:58Z"}],"graph_snapshots":[{"event_id":"sha256:d7009481ac251f9f537b69d7ded27a08f3b708b9122dc0a04fdda95dbb0ad1c4","target":"graph","created_at":"2026-05-18T02:29:45Z","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 examine the distribution of neutral hydrogen in cosmological simulations carried out with the new moving-mesh code AREPO and compare it with the corresponding GADGET simulations based on the smoothed particle hydrodynamics (SPH) technique. The two codes use identical gravity solvers and baryonic physics implementations, but very different methods for solving the Euler equations, allowing us to assess how numerical effects associated with the hydro-solver impact the results of simulations. Here we focus on an analysis of the neutral gas, as detected in quasar absorption lines. We find that t","authors_text":"Debora Sijacki, Lars Hernquist, Mark Vogelsberger, Matias Zaldarriaga, Simeon Bird, Volker Springel","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-10T20:00:01Z","title":"Moving mesh cosmology: properties of neutral hydrogen in absorption"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.2118","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":"sha256:99ca451566b022c1f93db0f2af8af5b6dba47af34dc4228234d93fe947194d5d","target":"record","created_at":"2026-05-18T02:29:45Z","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":"9f683f7aa77aa30add00322172df4e6d6d80ad487de5542ca0f71449c67be1b6","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-10T20:00:01Z","title_canon_sha256":"5475b7999ca1940f4c90642d2200429a995fcc98c91c93a581dc3d4de841fe40"},"schema_version":"1.0","source":{"id":"1209.2118","kind":"arxiv","version":2}},"canonical_sha256":"07dc72bbac210df7314d5565c15a87b5c6478233ce84208664d671b90028121c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"07dc72bbac210df7314d5565c15a87b5c6478233ce84208664d671b90028121c","first_computed_at":"2026-05-18T02:29:45.812167Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:29:45.812167Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CM+hdGDBSyLVCdROdoiG4e1ZiSCXXqn1F3hVWxQIkQRvpDpAzUfUFgmzhCwNRrBQIqf+PlAmJQY0vp67RCkUCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:29:45.812975Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.2118","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:99ca451566b022c1f93db0f2af8af5b6dba47af34dc4228234d93fe947194d5d","sha256:d7009481ac251f9f537b69d7ded27a08f3b708b9122dc0a04fdda95dbb0ad1c4"],"state_sha256":"8dcb54fd6731dc86ee67d1d74122b8622d2ffe1533a4fa047fdf10bf30e27aa4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"D2YNS5T1qMxWwBah5+HAW2rwEPvDTJ2FPKmm+Xfgh6HO+3f5eth9fjDPROQHdGLgKbA3WSgu+/tntiG0/I1zDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T12:12:58.983426Z","bundle_sha256":"0ede59eae1475d5af4d89117a434c5bca4d2c221c9b04c24b269ba9d58bc13a7"}}