{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:Y72XVK3Y2OZHGX3DR4JQYRGELV","short_pith_number":"pith:Y72XVK3Y","canonical_record":{"source":{"id":"1807.04037","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-07-11T09:38:23Z","cross_cats_sorted":[],"title_canon_sha256":"206503df3c898c13531f66c4b6637ff4eac9da74fb4119c3efb58bf5b8c44e39","abstract_canon_sha256":"a79bd6a862f83aed44536d05e981a0398fc35831d40551fc6d4a2cfc533ecb14"},"schema_version":"1.0"},"canonical_sha256":"c7f57aab78d3b2735f638f130c44c45d539216f85acf689550dd18348c2d9f9b","source":{"kind":"arxiv","id":"1807.04037","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.04037","created_at":"2026-05-18T00:02:59Z"},{"alias_kind":"arxiv_version","alias_value":"1807.04037v3","created_at":"2026-05-18T00:02:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.04037","created_at":"2026-05-18T00:02:59Z"},{"alias_kind":"pith_short_12","alias_value":"Y72XVK3Y2OZH","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"Y72XVK3Y2OZHGX3D","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"Y72XVK3Y","created_at":"2026-05-18T12:33:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:Y72XVK3Y2OZHGX3DR4JQYRGELV","target":"record","payload":{"canonical_record":{"source":{"id":"1807.04037","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-07-11T09:38:23Z","cross_cats_sorted":[],"title_canon_sha256":"206503df3c898c13531f66c4b6637ff4eac9da74fb4119c3efb58bf5b8c44e39","abstract_canon_sha256":"a79bd6a862f83aed44536d05e981a0398fc35831d40551fc6d4a2cfc533ecb14"},"schema_version":"1.0"},"canonical_sha256":"c7f57aab78d3b2735f638f130c44c45d539216f85acf689550dd18348c2d9f9b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:02:59.621144Z","signature_b64":"i1lP0DNpX6+0w1Hd1cd9CICEcXvopRx7EyUsYday7w3iiaA2Nd8GTv4JaBbuLVpqr9S2Oqpgkm91E+UbiMt4DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c7f57aab78d3b2735f638f130c44c45d539216f85acf689550dd18348c2d9f9b","last_reissued_at":"2026-05-18T00:02:59.620592Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:02:59.620592Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.04037","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":"2026-05-18T00:02:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"B8s6VQ7DiA/QdQt7J5aCeyvJnydFaGsKHHcqg5e1kbDM/W2xpqirBxCcqJOSEYbtCvRH2Sr9av8p4Jpq6Cp/Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T22:59:33.918826Z"},"content_sha256":"f251bc3d75b177eb82213ae81e073cfa768da16c6d277816df94f063fb8817fe","schema_version":"1.0","event_id":"sha256:f251bc3d75b177eb82213ae81e073cfa768da16c6d277816df94f063fb8817fe"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:Y72XVK3Y2OZHGX3DR4JQYRGELV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"PyUltraLight: A Pseudo-Spectral Solver for Ultralight Dark Matter Dynamics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Emily Kendall, Faber Edwards, Richard Easther, Shaun Hotchkiss","submitted_at":"2018-07-11T09:38:23Z","abstract_excerpt":"PyUltraLight simulates the dynamics of ultralight dark matter in a non-expanding background. PyUltraLight can describe the evolution of several interacting ultralight dark matter halos or one or more halos orbiting a central, fixed Newtonian potential, the latter scenario corresponding to dwarf galaxies orbiting a massive central galaxy. We verify PyUltraLight by showing that it reproduces qualitative dynamical features of previously published simulations and demonstrate that it has excellent energy-conservation properties. PyUltraLight is implemented in a Python-based Jupyter notebook, solvin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.04037","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":"2026-05-18T00:02:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zeO6fz3IoS6+dqlsDYPtH/BADnDICr0NcwiNsf3ExW0wbZApa1EqDQ40D1yVFy70fe1m2gXKlGnabTv58He8Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T22:59:33.919173Z"},"content_sha256":"92c1af3ecda7192cdc86227c1d883fc5f0c5a85c390ed3af136fca6f76170c71","schema_version":"1.0","event_id":"sha256:92c1af3ecda7192cdc86227c1d883fc5f0c5a85c390ed3af136fca6f76170c71"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Y72XVK3Y2OZHGX3DR4JQYRGELV/bundle.json","state_url":"https://pith.science/pith/Y72XVK3Y2OZHGX3DR4JQYRGELV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Y72XVK3Y2OZHGX3DR4JQYRGELV/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":"2026-06-02T22:59:33Z","links":{"resolver":"https://pith.science/pith/Y72XVK3Y2OZHGX3DR4JQYRGELV","bundle":"https://pith.science/pith/Y72XVK3Y2OZHGX3DR4JQYRGELV/bundle.json","state":"https://pith.science/pith/Y72XVK3Y2OZHGX3DR4JQYRGELV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Y72XVK3Y2OZHGX3DR4JQYRGELV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:Y72XVK3Y2OZHGX3DR4JQYRGELV","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":"a79bd6a862f83aed44536d05e981a0398fc35831d40551fc6d4a2cfc533ecb14","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-07-11T09:38:23Z","title_canon_sha256":"206503df3c898c13531f66c4b6637ff4eac9da74fb4119c3efb58bf5b8c44e39"},"schema_version":"1.0","source":{"id":"1807.04037","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.04037","created_at":"2026-05-18T00:02:59Z"},{"alias_kind":"arxiv_version","alias_value":"1807.04037v3","created_at":"2026-05-18T00:02:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.04037","created_at":"2026-05-18T00:02:59Z"},{"alias_kind":"pith_short_12","alias_value":"Y72XVK3Y2OZH","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"Y72XVK3Y2OZHGX3D","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"Y72XVK3Y","created_at":"2026-05-18T12:33:04Z"}],"graph_snapshots":[{"event_id":"sha256:92c1af3ecda7192cdc86227c1d883fc5f0c5a85c390ed3af136fca6f76170c71","target":"graph","created_at":"2026-05-18T00:02:59Z","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":"PyUltraLight simulates the dynamics of ultralight dark matter in a non-expanding background. PyUltraLight can describe the evolution of several interacting ultralight dark matter halos or one or more halos orbiting a central, fixed Newtonian potential, the latter scenario corresponding to dwarf galaxies orbiting a massive central galaxy. We verify PyUltraLight by showing that it reproduces qualitative dynamical features of previously published simulations and demonstrate that it has excellent energy-conservation properties. PyUltraLight is implemented in a Python-based Jupyter notebook, solvin","authors_text":"Emily Kendall, Faber Edwards, Richard Easther, Shaun Hotchkiss","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-07-11T09:38:23Z","title":"PyUltraLight: A Pseudo-Spectral Solver for Ultralight Dark Matter Dynamics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.04037","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:f251bc3d75b177eb82213ae81e073cfa768da16c6d277816df94f063fb8817fe","target":"record","created_at":"2026-05-18T00:02:59Z","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":"a79bd6a862f83aed44536d05e981a0398fc35831d40551fc6d4a2cfc533ecb14","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-07-11T09:38:23Z","title_canon_sha256":"206503df3c898c13531f66c4b6637ff4eac9da74fb4119c3efb58bf5b8c44e39"},"schema_version":"1.0","source":{"id":"1807.04037","kind":"arxiv","version":3}},"canonical_sha256":"c7f57aab78d3b2735f638f130c44c45d539216f85acf689550dd18348c2d9f9b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c7f57aab78d3b2735f638f130c44c45d539216f85acf689550dd18348c2d9f9b","first_computed_at":"2026-05-18T00:02:59.620592Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:02:59.620592Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"i1lP0DNpX6+0w1Hd1cd9CICEcXvopRx7EyUsYday7w3iiaA2Nd8GTv4JaBbuLVpqr9S2Oqpgkm91E+UbiMt4DA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:02:59.621144Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.04037","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f251bc3d75b177eb82213ae81e073cfa768da16c6d277816df94f063fb8817fe","sha256:92c1af3ecda7192cdc86227c1d883fc5f0c5a85c390ed3af136fca6f76170c71"],"state_sha256":"a9a67b03e6cf52950815a16f626a6f2f44cdb7003111043b4c21dc57f00282a8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ybSsKw+zFSB2P+gIRpGUC3RT9m8/Y8a/Wt4ODCYCch8GbIcfczDvrFZ9/KnxyAatdyB/Mew6dDsfC3MadDYSCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T22:59:33.921118Z","bundle_sha256":"98cc4aecd932879247d79418f2c1d9712c7c238a254a173504734683710e658d"}}