{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:I35M4MA4WAT6PUSISHZBN6ZFPB","short_pith_number":"pith:I35M4MA4","canonical_record":{"source":{"id":"2004.11397","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2020-04-23T18:00:11Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"58bffe64614a50ab25df0bbf20d607ea4ed0ed914ac22cef93a662980bcbf83f","abstract_canon_sha256":"15acc4f7f27219dc975a411f1707a642fabca36b84b6437467129a0e073c17d2"},"schema_version":"1.0"},"canonical_sha256":"46face301cb027e7d24891f216fb25787466a4cff411d37529575c77d072deb0","source":{"kind":"arxiv","id":"2004.11397","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.11397","created_at":"2026-07-05T01:46:19Z"},{"alias_kind":"arxiv_version","alias_value":"2004.11397v2","created_at":"2026-07-05T01:46:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.11397","created_at":"2026-07-05T01:46:19Z"},{"alias_kind":"pith_short_12","alias_value":"I35M4MA4WAT6","created_at":"2026-07-05T01:46:19Z"},{"alias_kind":"pith_short_16","alias_value":"I35M4MA4WAT6PUSI","created_at":"2026-07-05T01:46:19Z"},{"alias_kind":"pith_short_8","alias_value":"I35M4MA4","created_at":"2026-07-05T01:46:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:I35M4MA4WAT6PUSISHZBN6ZFPB","target":"record","payload":{"canonical_record":{"source":{"id":"2004.11397","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2020-04-23T18:00:11Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"58bffe64614a50ab25df0bbf20d607ea4ed0ed914ac22cef93a662980bcbf83f","abstract_canon_sha256":"15acc4f7f27219dc975a411f1707a642fabca36b84b6437467129a0e073c17d2"},"schema_version":"1.0"},"canonical_sha256":"46face301cb027e7d24891f216fb25787466a4cff411d37529575c77d072deb0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:46:19.204758Z","signature_b64":"4NiCd7EfWMVXbzQPbi8HyUGq0mIABKYpVrhVoHkKP4+JiQa8JMYEXNbBqZWVPDOlgcq/vOz0qtkN10VZ/KLuDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"46face301cb027e7d24891f216fb25787466a4cff411d37529575c77d072deb0","last_reissued_at":"2026-07-05T01:46:19.204350Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:46:19.204350Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2004.11397","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T01:46:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3lDe98EXUGsrtvWC4xoj/ezmGWUuhtTnvVlMnhTpN6MQEWYKvWXEwrC7zg+RJEVYaP2waHygm5n+dHMyvMmUCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T08:27:41.604602Z"},"content_sha256":"208c16e064ec2318d00efdaa84969457974b82c4fddb6f6a332cf0915f59febf","schema_version":"1.0","event_id":"sha256:208c16e064ec2318d00efdaa84969457974b82c4fddb6f6a332cf0915f59febf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:I35M4MA4WAT6PUSISHZBN6ZFPB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"DAYENU: A Simple Filter of Smooth Foregrounds for Intensity Mapping Power Spectra","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.CO","authors_text":"Aaron Ewall-Wice, Aaron Parsons, Adam Lanman, Adrian Liu, Chuneeta Nunhokee, David R. DeBoer, Eloy de Lera Acedo, James Aguirre, Joshua S. Dillon, Nicholas Kern, Nicolas Fagnoni, Paul La Plante, Philip Bull, Saurabh Singh, Sean Weinberg, T. Joseph Lazio, Tzu-Ching Chang","submitted_at":"2020-04-23T18:00:11Z","abstract_excerpt":"We introduce DAYENU, a linear, spectral filter for HI intensity mapping that achieves the desirable foreground mitigation and error minimization properties of inverse co-variance weighting with minimal modeling of the underlying data. Beyond 21 cm power-spectrum estimation, our filter is suitable for any analysis where high dynamic-range removal of spectrally smooth foregrounds in irregularly (or regularly) sampled data is required, something required by many other intensity mapping techniques. Our filtering matrix is diagonalized by Discrete Prolate Spheroidal Sequences which are an optimal b"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.11397","kind":"arxiv","version":2},"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/2004.11397/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":"2026-07-05T01:46:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p7dFf8j/9oyuoIxpnNYOzCRmgOlTFkX9JcWfSb10qlk2SRul/PVjImQ4gHrMNCxsc+/9qxa0FbR7j75KeUGqAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T08:27:41.605130Z"},"content_sha256":"53f75ae15b40370dbe3273615933d6f3a7fbbf6f76d4c72a3ca6d3ebd488fb13","schema_version":"1.0","event_id":"sha256:53f75ae15b40370dbe3273615933d6f3a7fbbf6f76d4c72a3ca6d3ebd488fb13"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/I35M4MA4WAT6PUSISHZBN6ZFPB/bundle.json","state_url":"https://pith.science/pith/I35M4MA4WAT6PUSISHZBN6ZFPB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/I35M4MA4WAT6PUSISHZBN6ZFPB/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":"2026-08-19T08:27:41Z","links":{"resolver":"https://pith.science/pith/I35M4MA4WAT6PUSISHZBN6ZFPB","bundle":"https://pith.science/pith/I35M4MA4WAT6PUSISHZBN6ZFPB/bundle.json","state":"https://pith.science/pith/I35M4MA4WAT6PUSISHZBN6ZFPB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/I35M4MA4WAT6PUSISHZBN6ZFPB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:I35M4MA4WAT6PUSISHZBN6ZFPB","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":"15acc4f7f27219dc975a411f1707a642fabca36b84b6437467129a0e073c17d2","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2020-04-23T18:00:11Z","title_canon_sha256":"58bffe64614a50ab25df0bbf20d607ea4ed0ed914ac22cef93a662980bcbf83f"},"schema_version":"1.0","source":{"id":"2004.11397","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.11397","created_at":"2026-07-05T01:46:19Z"},{"alias_kind":"arxiv_version","alias_value":"2004.11397v2","created_at":"2026-07-05T01:46:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.11397","created_at":"2026-07-05T01:46:19Z"},{"alias_kind":"pith_short_12","alias_value":"I35M4MA4WAT6","created_at":"2026-07-05T01:46:19Z"},{"alias_kind":"pith_short_16","alias_value":"I35M4MA4WAT6PUSI","created_at":"2026-07-05T01:46:19Z"},{"alias_kind":"pith_short_8","alias_value":"I35M4MA4","created_at":"2026-07-05T01:46:19Z"}],"graph_snapshots":[{"event_id":"sha256:53f75ae15b40370dbe3273615933d6f3a7fbbf6f76d4c72a3ca6d3ebd488fb13","target":"graph","created_at":"2026-07-05T01:46:19Z","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/2004.11397/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We introduce DAYENU, a linear, spectral filter for HI intensity mapping that achieves the desirable foreground mitigation and error minimization properties of inverse co-variance weighting with minimal modeling of the underlying data. Beyond 21 cm power-spectrum estimation, our filter is suitable for any analysis where high dynamic-range removal of spectrally smooth foregrounds in irregularly (or regularly) sampled data is required, something required by many other intensity mapping techniques. Our filtering matrix is diagonalized by Discrete Prolate Spheroidal Sequences which are an optimal b","authors_text":"Aaron Ewall-Wice, Aaron Parsons, Adam Lanman, Adrian Liu, Chuneeta Nunhokee, David R. DeBoer, Eloy de Lera Acedo, James Aguirre, Joshua S. Dillon, Nicholas Kern, Nicolas Fagnoni, Paul La Plante, Philip Bull, Saurabh Singh, Sean Weinberg, T. Joseph Lazio, Tzu-Ching Chang","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2020-04-23T18:00:11Z","title":"DAYENU: A Simple Filter of Smooth Foregrounds for Intensity Mapping Power Spectra"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.11397","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":"sha256:208c16e064ec2318d00efdaa84969457974b82c4fddb6f6a332cf0915f59febf","target":"record","created_at":"2026-07-05T01:46:19Z","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":"15acc4f7f27219dc975a411f1707a642fabca36b84b6437467129a0e073c17d2","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2020-04-23T18:00:11Z","title_canon_sha256":"58bffe64614a50ab25df0bbf20d607ea4ed0ed914ac22cef93a662980bcbf83f"},"schema_version":"1.0","source":{"id":"2004.11397","kind":"arxiv","version":2}},"canonical_sha256":"46face301cb027e7d24891f216fb25787466a4cff411d37529575c77d072deb0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"46face301cb027e7d24891f216fb25787466a4cff411d37529575c77d072deb0","first_computed_at":"2026-07-05T01:46:19.204350Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:46:19.204350Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4NiCd7EfWMVXbzQPbi8HyUGq0mIABKYpVrhVoHkKP4+JiQa8JMYEXNbBqZWVPDOlgcq/vOz0qtkN10VZ/KLuDA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:46:19.204758Z","signed_message":"canonical_sha256_bytes"},"source_id":"2004.11397","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:208c16e064ec2318d00efdaa84969457974b82c4fddb6f6a332cf0915f59febf","sha256:53f75ae15b40370dbe3273615933d6f3a7fbbf6f76d4c72a3ca6d3ebd488fb13"],"state_sha256":"de58f3d9b5c858bf5f3e9655486ee5ee40d5cb4266824748dbcef996ce3b19bb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c/V41RHHIuY4R5AQgJK7FWihfIA7cG189QwjCIjIovOQjezkWlL4rlAsF5dmrtGrZJzhsr9spL+gZjBRFq9MBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-19T08:27:41.610699Z","bundle_sha256":"a4d4305198fd0edf7c9545e49d478cbfda9330b9481fcaa22f988a54132a3f46"}}