{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:QJLZQ2A4Y6GGETX5VX2THR6LVO","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":"85a454b9a69220ae218f4082cf03e71d0cd6512733dc273e90a74311dce70624","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-05-07T16:40:40Z","title_canon_sha256":"fccfe685f24dbefd8fa458261522cc4d9842a34f21172487a2a873db555b275c"},"schema_version":"1.0","source":{"id":"0905.1066","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.1066","created_at":"2026-07-04T15:53:14Z"},{"alias_kind":"arxiv_version","alias_value":"0905.1066v2","created_at":"2026-07-04T15:53:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.1066","created_at":"2026-07-04T15:53:14Z"},{"alias_kind":"pith_short_12","alias_value":"QJLZQ2A4Y6GG","created_at":"2026-07-04T15:53:14Z"},{"alias_kind":"pith_short_16","alias_value":"QJLZQ2A4Y6GGETX5","created_at":"2026-07-04T15:53:14Z"},{"alias_kind":"pith_short_8","alias_value":"QJLZQ2A4","created_at":"2026-07-04T15:53:14Z"}],"graph_snapshots":[{"event_id":"sha256:4834edd690f249e7014664cd3056423696800f6292db06439afa274786a1b860","target":"graph","created_at":"2026-07-04T15:53:14Z","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/0905.1066/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In virtual worlds, objects fall straight down. By replacing a few lines of code to include Newton's gravity, virtual world software can become an N-body simulation code with visualization included where objects move under their mutual gravitational attraction as stars in a cluster. We report on our recent experience of adding a gravitational N-body simulator to the OpenSim virtual world physics engine. OpenSim is an open-source, virtual world server that provides a 3D immersive experience to users who connect using the popular \"Second Life\" client software from Linden Labs. With the addition o","authors_text":"Adam Johnson, Jeff Ames, Piet Hut, Will M. Farr","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-05-07T16:40:40Z","title":"An Experiment in Using Virtual Worlds for Scientific Visualization of Self-Gravitating Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.1066","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":"sha256:9e449d8647dc141ed9e98fed901bbd98c8ae59261ac6fed0f3e939e88eb2abf0","target":"record","created_at":"2026-07-04T15:53:14Z","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":"85a454b9a69220ae218f4082cf03e71d0cd6512733dc273e90a74311dce70624","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-05-07T16:40:40Z","title_canon_sha256":"fccfe685f24dbefd8fa458261522cc4d9842a34f21172487a2a873db555b275c"},"schema_version":"1.0","source":{"id":"0905.1066","kind":"arxiv","version":2}},"canonical_sha256":"825798681cc78c624efdadf533c7cbab973ab1b6ce86396cc1a989ff0759fef3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"825798681cc78c624efdadf533c7cbab973ab1b6ce86396cc1a989ff0759fef3","first_computed_at":"2026-07-04T15:53:14.170159Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:53:14.170159Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"D0X0iLifqaYO3i4iJkqOdWQhoAIaX25Cqnu6wUBhBrHhhbrdJa6G4qUJkthr3XzkAm4Tk36z7WxEzTt+0XmHAw==","signature_status":"signed_v1","signed_at":"2026-07-04T15:53:14.170507Z","signed_message":"canonical_sha256_bytes"},"source_id":"0905.1066","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9e449d8647dc141ed9e98fed901bbd98c8ae59261ac6fed0f3e939e88eb2abf0","sha256:4834edd690f249e7014664cd3056423696800f6292db06439afa274786a1b860"],"state_sha256":"82312ec5b551f69bfd7a83554f5704844db80c040dd2e362b11e4f64d9585b52"}