{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:C26WRMZTT5EYVVZKCH4WFYDA5F","short_pith_number":"pith:C26WRMZT","canonical_record":{"source":{"id":"1505.02783","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-05-11T20:01:23Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA","astro-ph.HE","astro-ph.SR","physics.flu-dyn"],"title_canon_sha256":"6c229d06ef098c7749d971f66b9a9fbddc361e2b12125598c5aad3ea0d87eb0f","abstract_canon_sha256":"0fabc3a3d3450ef4d121a2a6899071afe9fca3121385b6aa4d8a55247544ddd4"},"schema_version":"1.0"},"canonical_sha256":"16bd68b3339f498ad72a11f962e060e97a7875207d27c888c520355ddf752963","source":{"kind":"arxiv","id":"1505.02783","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.02783","created_at":"2026-05-18T01:24:24Z"},{"alias_kind":"arxiv_version","alias_value":"1505.02783v3","created_at":"2026-05-18T01:24:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.02783","created_at":"2026-05-18T01:24:24Z"},{"alias_kind":"pith_short_12","alias_value":"C26WRMZTT5EY","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"C26WRMZTT5EYVVZK","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"C26WRMZT","created_at":"2026-05-18T12:29:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:C26WRMZTT5EYVVZKCH4WFYDA5F","target":"record","payload":{"canonical_record":{"source":{"id":"1505.02783","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-05-11T20:01:23Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA","astro-ph.HE","astro-ph.SR","physics.flu-dyn"],"title_canon_sha256":"6c229d06ef098c7749d971f66b9a9fbddc361e2b12125598c5aad3ea0d87eb0f","abstract_canon_sha256":"0fabc3a3d3450ef4d121a2a6899071afe9fca3121385b6aa4d8a55247544ddd4"},"schema_version":"1.0"},"canonical_sha256":"16bd68b3339f498ad72a11f962e060e97a7875207d27c888c520355ddf752963","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:24:24.882717Z","signature_b64":"kZ3UPy8neog71H3nN3yZYP3zHgW5ST8NSR6DyC8eAiuOSxkUOFKwLiGSVOxNuON1FfRGRvBvT2gG8zZuj67tBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"16bd68b3339f498ad72a11f962e060e97a7875207d27c888c520355ddf752963","last_reissued_at":"2026-05-18T01:24:24.882109Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:24:24.882109Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1505.02783","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":"2026-05-18T01:24:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KOcq2bdNJyRvM4PTySO4yaQ1DR/qBUFxA8y9oCOfjIyfeonfcVvY0j19ofG1ThEcLLVKfABtK7iVofV2b27ABg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T22:21:03.587504Z"},"content_sha256":"44d826e7ea91ec30c4ad09d4cdf18d910233a7ce681ede135f2df351806c096d","schema_version":"1.0","event_id":"sha256:44d826e7ea91ec30c4ad09d4cdf18d910233a7ce681ede135f2df351806c096d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:C26WRMZTT5EYVVZKCH4WFYDA5F","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Accurate, Meshless Methods for Magneto-Hydrodynamics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.GA","astro-ph.HE","astro-ph.SR","physics.flu-dyn"],"primary_cat":"astro-ph.IM","authors_text":"Matthias J. Raives (Caltech), Philip F. Hopkins","submitted_at":"2015-05-11T20:01:23Z","abstract_excerpt":"Recently, we developed a pair of meshless finite-volume Lagrangian methods for hydrodynamics: the 'meshless finite mass' (MFM) and 'meshless finite volume' (MFV) methods. These capture advantages of both smoothed-particle hydrodynamics (SPH) and adaptive mesh-refinement (AMR) schemes. Here, we extend these to include ideal magneto-hydrodynamics (MHD). The MHD equations are second-order consistent and conservative. We augment these with a divergence-cleaning scheme, which maintains div*B~0 to high accuracy. We implement these in the code GIZMO, together with a state-of-the-art implementation of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.02783","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":"2026-05-18T01:24:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xzZwhMkslNkxUnMcgAAku/Lpno2kqG2Pmo/xtBo6kAl/9lAq4BK41JquYfoQ9AB8zX3W1ADZ7EnMl4qXDF7PDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T22:21:03.587849Z"},"content_sha256":"ab89ba6f9681468a03b49ff84e76e652f029e7dcce1475d02368d57ff0a7578e","schema_version":"1.0","event_id":"sha256:ab89ba6f9681468a03b49ff84e76e652f029e7dcce1475d02368d57ff0a7578e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/C26WRMZTT5EYVVZKCH4WFYDA5F/bundle.json","state_url":"https://pith.science/pith/C26WRMZTT5EYVVZKCH4WFYDA5F/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/C26WRMZTT5EYVVZKCH4WFYDA5F/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":"2026-06-29T22:21:03Z","links":{"resolver":"https://pith.science/pith/C26WRMZTT5EYVVZKCH4WFYDA5F","bundle":"https://pith.science/pith/C26WRMZTT5EYVVZKCH4WFYDA5F/bundle.json","state":"https://pith.science/pith/C26WRMZTT5EYVVZKCH4WFYDA5F/state.json","well_known_bundle":"https://pith.science/.well-known/pith/C26WRMZTT5EYVVZKCH4WFYDA5F/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:C26WRMZTT5EYVVZKCH4WFYDA5F","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":"0fabc3a3d3450ef4d121a2a6899071afe9fca3121385b6aa4d8a55247544ddd4","cross_cats_sorted":["astro-ph.CO","astro-ph.GA","astro-ph.HE","astro-ph.SR","physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-05-11T20:01:23Z","title_canon_sha256":"6c229d06ef098c7749d971f66b9a9fbddc361e2b12125598c5aad3ea0d87eb0f"},"schema_version":"1.0","source":{"id":"1505.02783","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.02783","created_at":"2026-05-18T01:24:24Z"},{"alias_kind":"arxiv_version","alias_value":"1505.02783v3","created_at":"2026-05-18T01:24:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.02783","created_at":"2026-05-18T01:24:24Z"},{"alias_kind":"pith_short_12","alias_value":"C26WRMZTT5EY","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"C26WRMZTT5EYVVZK","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"C26WRMZT","created_at":"2026-05-18T12:29:14Z"}],"graph_snapshots":[{"event_id":"sha256:ab89ba6f9681468a03b49ff84e76e652f029e7dcce1475d02368d57ff0a7578e","target":"graph","created_at":"2026-05-18T01:24:24Z","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":"Recently, we developed a pair of meshless finite-volume Lagrangian methods for hydrodynamics: the 'meshless finite mass' (MFM) and 'meshless finite volume' (MFV) methods. These capture advantages of both smoothed-particle hydrodynamics (SPH) and adaptive mesh-refinement (AMR) schemes. Here, we extend these to include ideal magneto-hydrodynamics (MHD). The MHD equations are second-order consistent and conservative. We augment these with a divergence-cleaning scheme, which maintains div*B~0 to high accuracy. We implement these in the code GIZMO, together with a state-of-the-art implementation of","authors_text":"Matthias J. Raives (Caltech), Philip F. Hopkins","cross_cats":["astro-ph.CO","astro-ph.GA","astro-ph.HE","astro-ph.SR","physics.flu-dyn"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-05-11T20:01:23Z","title":"Accurate, Meshless Methods for Magneto-Hydrodynamics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.02783","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":"sha256:44d826e7ea91ec30c4ad09d4cdf18d910233a7ce681ede135f2df351806c096d","target":"record","created_at":"2026-05-18T01:24:24Z","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":"0fabc3a3d3450ef4d121a2a6899071afe9fca3121385b6aa4d8a55247544ddd4","cross_cats_sorted":["astro-ph.CO","astro-ph.GA","astro-ph.HE","astro-ph.SR","physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-05-11T20:01:23Z","title_canon_sha256":"6c229d06ef098c7749d971f66b9a9fbddc361e2b12125598c5aad3ea0d87eb0f"},"schema_version":"1.0","source":{"id":"1505.02783","kind":"arxiv","version":3}},"canonical_sha256":"16bd68b3339f498ad72a11f962e060e97a7875207d27c888c520355ddf752963","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"16bd68b3339f498ad72a11f962e060e97a7875207d27c888c520355ddf752963","first_computed_at":"2026-05-18T01:24:24.882109Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:24:24.882109Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kZ3UPy8neog71H3nN3yZYP3zHgW5ST8NSR6DyC8eAiuOSxkUOFKwLiGSVOxNuON1FfRGRvBvT2gG8zZuj67tBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:24:24.882717Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.02783","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:44d826e7ea91ec30c4ad09d4cdf18d910233a7ce681ede135f2df351806c096d","sha256:ab89ba6f9681468a03b49ff84e76e652f029e7dcce1475d02368d57ff0a7578e"],"state_sha256":"e729fdae714aac92d1dec6cf39248fc007f036d1f41a66244d7e58eab3829aea"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SfA1/U+r3LOKHUTN+SMoqtJhRy4GuDGCGl9ZNEEJNiEu2dBTjOLecJlLP63lph4Lecbvpe/ddvbARu7c2+xYAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-29T22:21:03.589697Z","bundle_sha256":"091ae25bb5ee3a86f6f98d862fb3738b899970e62ed947dd0548bfa4c6f60553"}}