{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:267XQZKZY2B5A72GWIUP4PT3I6","short_pith_number":"pith:267XQZKZ","canonical_record":{"source":{"id":"2606.13398","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-06-11T14:30:11Z","cross_cats_sorted":["physics.plasm-ph"],"title_canon_sha256":"f5883b63bb313b99292ac6f7050bc1e1df64874246c55967772e5a7d7636c27a","abstract_canon_sha256":"34344c8714ef15ab08e5b35415497fe880ef1d4a9279d114266188c5dee9af84"},"schema_version":"1.0"},"canonical_sha256":"d7bf786559c683d07f46b228fe3e7b479f047a4bef462586a581e1060dc46032","source":{"kind":"arxiv","id":"2606.13398","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.13398","created_at":"2026-06-12T01:10:00Z"},{"alias_kind":"arxiv_version","alias_value":"2606.13398v1","created_at":"2026-06-12T01:10:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.13398","created_at":"2026-06-12T01:10:00Z"},{"alias_kind":"pith_short_12","alias_value":"267XQZKZY2B5","created_at":"2026-06-12T01:10:00Z"},{"alias_kind":"pith_short_16","alias_value":"267XQZKZY2B5A72G","created_at":"2026-06-12T01:10:00Z"},{"alias_kind":"pith_short_8","alias_value":"267XQZKZ","created_at":"2026-06-12T01:10:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:267XQZKZY2B5A72GWIUP4PT3I6","target":"record","payload":{"canonical_record":{"source":{"id":"2606.13398","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-06-11T14:30:11Z","cross_cats_sorted":["physics.plasm-ph"],"title_canon_sha256":"f5883b63bb313b99292ac6f7050bc1e1df64874246c55967772e5a7d7636c27a","abstract_canon_sha256":"34344c8714ef15ab08e5b35415497fe880ef1d4a9279d114266188c5dee9af84"},"schema_version":"1.0"},"canonical_sha256":"d7bf786559c683d07f46b228fe3e7b479f047a4bef462586a581e1060dc46032","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-12T01:10:00.425919Z","signature_b64":"c2IF82rwWVSWUh/r9kXN/6GxIC2toV/AP1KUjmUBbx4z5G0QpYUvfnKSaqYDUAossjgwpeqRemEb02T2WC19DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d7bf786559c683d07f46b228fe3e7b479f047a4bef462586a581e1060dc46032","last_reissued_at":"2026-06-12T01:10:00.425014Z","signature_status":"signed_v1","first_computed_at":"2026-06-12T01:10:00.425014Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.13398","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":"2026-06-12T01:10:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"43pq9xiUvdjyt7zrYj5rtCb3TrAb1sQ6k2sizSJPkCXkQXiyGmOrSErF+FJaDhhvy4kKdR7KFRGg+oI8ykCeCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T12:22:24.580194Z"},"content_sha256":"2e82577fbeaba1d0636b341532ac42d2148116fd7dc0f3ba576d35a8d4aa9dc0","schema_version":"1.0","event_id":"sha256:2e82577fbeaba1d0636b341532ac42d2148116fd7dc0f3ba576d35a8d4aa9dc0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:267XQZKZY2B5A72GWIUP4PT3I6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A robust super-time-stepping scheme for Ohmic and ambipolar diffusion","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.plasm-ph"],"primary_cat":"astro-ph.IM","authors_text":"Anastasia Tzouvanou, Daniele Crocco, David Melon Fuksman, Giancarlo Mattia, Mario Flock, Vittoria Berta","submitted_at":"2026-06-11T14:30:11Z","abstract_excerpt":"Context. Non-ideal magnetohydrodynamics (MHD) is a key tool for modeling magnetic flux transport in astrophysical systems such as molecular clouds, protostellar cores, and protoplanetary disks. Conventional explicit methods for non-ideal MHD diffusion are severely limited by timestep constraints, while substepping approaches can be unstable due to truncation errors near boundaries and strong magnetic-field gradients. Aims. Our main goal is to address these limitations by developing robust super-time-stepping methods for Ohmic and ambipolar diffusion. Methods. We present a super-time-stepping m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.13398","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.13398/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-06-12T01:10:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lgODFJZA0vEGLuR/6VppBncfFnWnu2ew/pVxTmK2B/A7fnNnx2pElkkkokaK00g3PfBFR4KIt2OUfOQ8H2O4BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T12:22:24.580578Z"},"content_sha256":"54ccac34cbd437dc6874c02a2181d196b9488877015ba3109184be896b440359","schema_version":"1.0","event_id":"sha256:54ccac34cbd437dc6874c02a2181d196b9488877015ba3109184be896b440359"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/267XQZKZY2B5A72GWIUP4PT3I6/bundle.json","state_url":"https://pith.science/pith/267XQZKZY2B5A72GWIUP4PT3I6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/267XQZKZY2B5A72GWIUP4PT3I6/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":"2026-06-27T12:22:24Z","links":{"resolver":"https://pith.science/pith/267XQZKZY2B5A72GWIUP4PT3I6","bundle":"https://pith.science/pith/267XQZKZY2B5A72GWIUP4PT3I6/bundle.json","state":"https://pith.science/pith/267XQZKZY2B5A72GWIUP4PT3I6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/267XQZKZY2B5A72GWIUP4PT3I6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:267XQZKZY2B5A72GWIUP4PT3I6","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":"34344c8714ef15ab08e5b35415497fe880ef1d4a9279d114266188c5dee9af84","cross_cats_sorted":["physics.plasm-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-06-11T14:30:11Z","title_canon_sha256":"f5883b63bb313b99292ac6f7050bc1e1df64874246c55967772e5a7d7636c27a"},"schema_version":"1.0","source":{"id":"2606.13398","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.13398","created_at":"2026-06-12T01:10:00Z"},{"alias_kind":"arxiv_version","alias_value":"2606.13398v1","created_at":"2026-06-12T01:10:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.13398","created_at":"2026-06-12T01:10:00Z"},{"alias_kind":"pith_short_12","alias_value":"267XQZKZY2B5","created_at":"2026-06-12T01:10:00Z"},{"alias_kind":"pith_short_16","alias_value":"267XQZKZY2B5A72G","created_at":"2026-06-12T01:10:00Z"},{"alias_kind":"pith_short_8","alias_value":"267XQZKZ","created_at":"2026-06-12T01:10:00Z"}],"graph_snapshots":[{"event_id":"sha256:54ccac34cbd437dc6874c02a2181d196b9488877015ba3109184be896b440359","target":"graph","created_at":"2026-06-12T01:10:00Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2606.13398/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Context. Non-ideal magnetohydrodynamics (MHD) is a key tool for modeling magnetic flux transport in astrophysical systems such as molecular clouds, protostellar cores, and protoplanetary disks. Conventional explicit methods for non-ideal MHD diffusion are severely limited by timestep constraints, while substepping approaches can be unstable due to truncation errors near boundaries and strong magnetic-field gradients. Aims. Our main goal is to address these limitations by developing robust super-time-stepping methods for Ohmic and ambipolar diffusion. Methods. We present a super-time-stepping m","authors_text":"Anastasia Tzouvanou, Daniele Crocco, David Melon Fuksman, Giancarlo Mattia, Mario Flock, Vittoria Berta","cross_cats":["physics.plasm-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-06-11T14:30:11Z","title":"A robust super-time-stepping scheme for Ohmic and ambipolar diffusion"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.13398","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":"sha256:2e82577fbeaba1d0636b341532ac42d2148116fd7dc0f3ba576d35a8d4aa9dc0","target":"record","created_at":"2026-06-12T01:10:00Z","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":"34344c8714ef15ab08e5b35415497fe880ef1d4a9279d114266188c5dee9af84","cross_cats_sorted":["physics.plasm-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-06-11T14:30:11Z","title_canon_sha256":"f5883b63bb313b99292ac6f7050bc1e1df64874246c55967772e5a7d7636c27a"},"schema_version":"1.0","source":{"id":"2606.13398","kind":"arxiv","version":1}},"canonical_sha256":"d7bf786559c683d07f46b228fe3e7b479f047a4bef462586a581e1060dc46032","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d7bf786559c683d07f46b228fe3e7b479f047a4bef462586a581e1060dc46032","first_computed_at":"2026-06-12T01:10:00.425014Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-12T01:10:00.425014Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"c2IF82rwWVSWUh/r9kXN/6GxIC2toV/AP1KUjmUBbx4z5G0QpYUvfnKSaqYDUAossjgwpeqRemEb02T2WC19DQ==","signature_status":"signed_v1","signed_at":"2026-06-12T01:10:00.425919Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.13398","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2e82577fbeaba1d0636b341532ac42d2148116fd7dc0f3ba576d35a8d4aa9dc0","sha256:54ccac34cbd437dc6874c02a2181d196b9488877015ba3109184be896b440359"],"state_sha256":"8a0bf4e360483c2fab9f3c9a627f64c737f4c3ba4c048df94940434d52db49a6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FF53RNfZifkp6PiURFEctuHZvZH3PmX0AGNUMYPkkxqTxx9lBhRiCQ+z6w816RWn/HWLVdfYLml4KYEwMCPpBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T12:22:24.582559Z","bundle_sha256":"b9d0930ae278e562829e2bbeab4c2d33d0cd78529b2fcc0e55bcc72e6f87553b"}}