{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:53BVARYY5HKE5RLU3IRJKJLLWA","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":"c0ebd1bf494b172fdcc8c9e3fed10de0b931c54284ea77408944af5ca3f29f5e","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-05-03T18:00:03Z","title_canon_sha256":"f13371ba95797699292dabcc83676ad74202444da84f783c0d611db5c197001f"},"schema_version":"1.0","source":{"id":"2105.01081","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.01081","created_at":"2026-07-05T03:32:02Z"},{"alias_kind":"arxiv_version","alias_value":"2105.01081v2","created_at":"2026-07-05T03:32:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.01081","created_at":"2026-07-05T03:32:02Z"},{"alias_kind":"pith_short_12","alias_value":"53BVARYY5HKE","created_at":"2026-07-05T03:32:02Z"},{"alias_kind":"pith_short_16","alias_value":"53BVARYY5HKE5RLU","created_at":"2026-07-05T03:32:02Z"},{"alias_kind":"pith_short_8","alias_value":"53BVARYY","created_at":"2026-07-05T03:32:02Z"}],"graph_snapshots":[{"event_id":"sha256:4906fba0be19343f1ab4b37786c0775bb73894350df918439affb5d7187b808d","target":"graph","created_at":"2026-07-05T03:32:02Z","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/2105.01081/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present methods for emulating the matter power spectrum by combining information from cosmological $N$-body simulations at different resolutions. An emulator allows estimation of simulation output by interpolating across the parameter space of a limited number of simulations. We present the first implementation in cosmology of multi-fidelity emulation, where many low-resolution simulations are combined with a few high-resolution simulations to achieve an increased emulation accuracy. The power spectrum's dependence on cosmology is learned from the low-resolution simulations, which are in tu","authors_text":"Christian R. Shelton, Ming-Feng Ho, Simeon Bird","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-05-03T18:00:03Z","title":"Multi-Fidelity Emulation for the Matter Power Spectrum using Gaussian Processes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.01081","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":"sha256:0d45a79a9a9a6e30e1faa4f30432db3be98ea876db6ca5d2dad373033974a84e","target":"record","created_at":"2026-07-05T03:32:02Z","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":"c0ebd1bf494b172fdcc8c9e3fed10de0b931c54284ea77408944af5ca3f29f5e","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-05-03T18:00:03Z","title_canon_sha256":"f13371ba95797699292dabcc83676ad74202444da84f783c0d611db5c197001f"},"schema_version":"1.0","source":{"id":"2105.01081","kind":"arxiv","version":2}},"canonical_sha256":"eec3504718e9d44ec574da2295256bb00487ca38b0d9163becabdc4d0a5be40a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"eec3504718e9d44ec574da2295256bb00487ca38b0d9163becabdc4d0a5be40a","first_computed_at":"2026-07-05T03:32:02.408612Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:32:02.408612Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HnpHdoVVOSiK4uOG1TNWBeh8DXZ9xa9/KX78gYRkx3+PD+od4sVHXtTqCJeGIieYeiSl6lfENIPx3iDY4FTCCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:32:02.409083Z","signed_message":"canonical_sha256_bytes"},"source_id":"2105.01081","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0d45a79a9a9a6e30e1faa4f30432db3be98ea876db6ca5d2dad373033974a84e","sha256:4906fba0be19343f1ab4b37786c0775bb73894350df918439affb5d7187b808d"],"state_sha256":"ef778fe1f0a1c9f9297c91a383c515d029c9758ca48bf151855c070d9a247dbb"}