{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:6GRDBJMEL7UBGEXQ2WME5JGUHH","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":"1bf7abb31ecc2da3eeeab3a4f1373a755ac721ba805018b2e4a44bc708b0618d","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-11-23T21:00:06Z","title_canon_sha256":"29d3c676279bfbb4c86d51c19b6e5f6021e09c5116719f93f067c0eeab1548d4"},"schema_version":"1.0","source":{"id":"1511.07444","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.07444","created_at":"2026-05-18T01:18:39Z"},{"alias_kind":"arxiv_version","alias_value":"1511.07444v2","created_at":"2026-05-18T01:18:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.07444","created_at":"2026-05-18T01:18:39Z"},{"alias_kind":"pith_short_12","alias_value":"6GRDBJMEL7UB","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_16","alias_value":"6GRDBJMEL7UBGEXQ","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_8","alias_value":"6GRDBJME","created_at":"2026-05-18T12:29:07Z"}],"graph_snapshots":[{"event_id":"sha256:52782bb652416067bf7bb9416286b4c197cdf99a25baf96d91526f53283fea51","target":"graph","created_at":"2026-05-18T01:18:39Z","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 present an on-the-fly geometrical approach for shock detection and Mach number calculation in simulations employing smoothed particle hydrodynamics (SPH). We utilize pressure gradients to select shock candidates and define up- and downstream positions. We obtain hydrodynamical states in the up- and downstream regimes with a series of normal and inverted kernel weightings parallel and perpendicular to the shock normals. Our on-the-fly geometrical Mach detector incorporates well within the SPH formalism and has low computational cost.\n  We implement our Mach detector into the simulation code ","authors_text":"Alexander M. Beck, Julius M. F. Donnert, K. Dolag","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-11-23T21:00:06Z","title":"Geometrical on-the-fly shock detection in SPH"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.07444","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:ce32d05bf92d79fc3a62400060f92bc3a38c4bbbcbe829a74f944da11399f5f1","target":"record","created_at":"2026-05-18T01:18:39Z","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":"1bf7abb31ecc2da3eeeab3a4f1373a755ac721ba805018b2e4a44bc708b0618d","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-11-23T21:00:06Z","title_canon_sha256":"29d3c676279bfbb4c86d51c19b6e5f6021e09c5116719f93f067c0eeab1548d4"},"schema_version":"1.0","source":{"id":"1511.07444","kind":"arxiv","version":2}},"canonical_sha256":"f1a230a5845fe81312f0d5984ea4d439e86b6dc16ea0c385c40d76f41517e50b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f1a230a5845fe81312f0d5984ea4d439e86b6dc16ea0c385c40d76f41517e50b","first_computed_at":"2026-05-18T01:18:39.771131Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:18:39.771131Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xWjMVLSeWitBKLElpdf+K78gQa5ZBtq8roio/ZZRATAhi3YHMPQHYgqnft7nErq7tDEUMDNyvwttIFyAdSh/Bg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:18:39.771660Z","signed_message":"canonical_sha256_bytes"},"source_id":"1511.07444","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ce32d05bf92d79fc3a62400060f92bc3a38c4bbbcbe829a74f944da11399f5f1","sha256:52782bb652416067bf7bb9416286b4c197cdf99a25baf96d91526f53283fea51"],"state_sha256":"97d6a34b406bc450cf7ad03bffa239790f82cda74b105957798b5d28a837734f"}