{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:JXHZPEOOI5B2RVYWF7U435MCXC","short_pith_number":"pith:JXHZPEOO","canonical_record":{"source":{"id":"2511.15072","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-11-19T03:24:01Z","cross_cats_sorted":[],"title_canon_sha256":"9e933f28987fbf90f5d8714b37316c87772106978c01c1b0180e2ed01d544680","abstract_canon_sha256":"af609b82944cc72386aac600ced3f88859fe902a1883ce7d2465e6194b841dcb"},"schema_version":"1.0"},"canonical_sha256":"4dcf9791ce4743a8d7162fe9cdf582b8bfbc65111c9c968dddbca0c6b83c4cab","source":{"kind":"arxiv","id":"2511.15072","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2511.15072","created_at":"2026-06-23T02:13:18Z"},{"alias_kind":"arxiv_version","alias_value":"2511.15072v3","created_at":"2026-06-23T02:13:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2511.15072","created_at":"2026-06-23T02:13:18Z"},{"alias_kind":"pith_short_12","alias_value":"JXHZPEOOI5B2","created_at":"2026-06-23T02:13:18Z"},{"alias_kind":"pith_short_16","alias_value":"JXHZPEOOI5B2RVYW","created_at":"2026-06-23T02:13:18Z"},{"alias_kind":"pith_short_8","alias_value":"JXHZPEOO","created_at":"2026-06-23T02:13:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:JXHZPEOOI5B2RVYWF7U435MCXC","target":"record","payload":{"canonical_record":{"source":{"id":"2511.15072","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-11-19T03:24:01Z","cross_cats_sorted":[],"title_canon_sha256":"9e933f28987fbf90f5d8714b37316c87772106978c01c1b0180e2ed01d544680","abstract_canon_sha256":"af609b82944cc72386aac600ced3f88859fe902a1883ce7d2465e6194b841dcb"},"schema_version":"1.0"},"canonical_sha256":"4dcf9791ce4743a8d7162fe9cdf582b8bfbc65111c9c968dddbca0c6b83c4cab","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-23T02:13:18.440600Z","signature_b64":"ABDTeMwi5ZcfWASkOkGO/N4DRkQIgTBWkwIg6s6uupYI/EAlZiet/otiUeDifSgQYWvi79GLqvD6Nry0HEnnAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4dcf9791ce4743a8d7162fe9cdf582b8bfbc65111c9c968dddbca0c6b83c4cab","last_reissued_at":"2026-06-23T02:13:18.440149Z","signature_status":"signed_v1","first_computed_at":"2026-06-23T02:13:18.440149Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2511.15072","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":"2026-06-23T02:13:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2MBB+NWmE6uW10dcnpN8fVJHfu5+DuHl4lIzpI1wfqHYvB161fjk5YCY4GYAck1BZNIRx9RMDQSJ31M4vwnQAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-02T19:52:39.206754Z"},"content_sha256":"4bdcbeccf68fd84ce5817d8cbf3260bacac16ff5ff992967de9946914416bee7","schema_version":"1.0","event_id":"sha256:4bdcbeccf68fd84ce5817d8cbf3260bacac16ff5ff992967de9946914416bee7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:JXHZPEOOI5B2RVYWF7U435MCXC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Deep learning with hybrid frequency differencing and principal component analysis for 21-cm foreground and beam mitigation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Feng Shi, Le Zhang, Ming Jiang, Shulei Ni, Xiaofan Ma, Xiaoping Li, Yanming Liu, Zitong Wang","submitted_at":"2025-11-19T03:24:01Z","abstract_excerpt":"Twenty-one-centimeter intensity mapping is a powerful probe of the large-scale distribution of neutral hydrogen (HI) and cosmological observables such as baryon acoustic oscillations. A major challenge is contamination from bright foregrounds and frequency-dependent beam effects, which can lead to signal loss in traditional methods such as principal component analysis (PCA). We develop a hybrid approach that trains a U-shaped convolutional neural network (UNet) on two input channels derived from frequency differencing (FD) and PCA cleaning, enabling it to exploit their complementary behavior a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2511.15072","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2511.15072/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":"2026-06-23T02:13:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E4qKB3W9xXyXUFsSWwxugWRjLNKDgxaFSc8vrSHvQ6OO4HvaWIhnV5ukD5R9GLk8amwL8gypamdBqPwzKQB+DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-02T19:52:39.207136Z"},"content_sha256":"480da01d1b9e8ad1852090bb981acd801a17cd8d89a43de9b3ecd49adc354eb4","schema_version":"1.0","event_id":"sha256:480da01d1b9e8ad1852090bb981acd801a17cd8d89a43de9b3ecd49adc354eb4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JXHZPEOOI5B2RVYWF7U435MCXC/bundle.json","state_url":"https://pith.science/pith/JXHZPEOOI5B2RVYWF7U435MCXC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JXHZPEOOI5B2RVYWF7U435MCXC/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":"2026-07-02T19:52:39Z","links":{"resolver":"https://pith.science/pith/JXHZPEOOI5B2RVYWF7U435MCXC","bundle":"https://pith.science/pith/JXHZPEOOI5B2RVYWF7U435MCXC/bundle.json","state":"https://pith.science/pith/JXHZPEOOI5B2RVYWF7U435MCXC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JXHZPEOOI5B2RVYWF7U435MCXC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:JXHZPEOOI5B2RVYWF7U435MCXC","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":"af609b82944cc72386aac600ced3f88859fe902a1883ce7d2465e6194b841dcb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-11-19T03:24:01Z","title_canon_sha256":"9e933f28987fbf90f5d8714b37316c87772106978c01c1b0180e2ed01d544680"},"schema_version":"1.0","source":{"id":"2511.15072","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2511.15072","created_at":"2026-06-23T02:13:18Z"},{"alias_kind":"arxiv_version","alias_value":"2511.15072v3","created_at":"2026-06-23T02:13:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2511.15072","created_at":"2026-06-23T02:13:18Z"},{"alias_kind":"pith_short_12","alias_value":"JXHZPEOOI5B2","created_at":"2026-06-23T02:13:18Z"},{"alias_kind":"pith_short_16","alias_value":"JXHZPEOOI5B2RVYW","created_at":"2026-06-23T02:13:18Z"},{"alias_kind":"pith_short_8","alias_value":"JXHZPEOO","created_at":"2026-06-23T02:13:18Z"}],"graph_snapshots":[{"event_id":"sha256:480da01d1b9e8ad1852090bb981acd801a17cd8d89a43de9b3ecd49adc354eb4","target":"graph","created_at":"2026-06-23T02:13:18Z","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/2511.15072/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Twenty-one-centimeter intensity mapping is a powerful probe of the large-scale distribution of neutral hydrogen (HI) and cosmological observables such as baryon acoustic oscillations. A major challenge is contamination from bright foregrounds and frequency-dependent beam effects, which can lead to signal loss in traditional methods such as principal component analysis (PCA). We develop a hybrid approach that trains a U-shaped convolutional neural network (UNet) on two input channels derived from frequency differencing (FD) and PCA cleaning, enabling it to exploit their complementary behavior a","authors_text":"Feng Shi, Le Zhang, Ming Jiang, Shulei Ni, Xiaofan Ma, Xiaoping Li, Yanming Liu, Zitong Wang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-11-19T03:24:01Z","title":"Deep learning with hybrid frequency differencing and principal component analysis for 21-cm foreground and beam mitigation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2511.15072","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":"sha256:4bdcbeccf68fd84ce5817d8cbf3260bacac16ff5ff992967de9946914416bee7","target":"record","created_at":"2026-06-23T02:13:18Z","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":"af609b82944cc72386aac600ced3f88859fe902a1883ce7d2465e6194b841dcb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-11-19T03:24:01Z","title_canon_sha256":"9e933f28987fbf90f5d8714b37316c87772106978c01c1b0180e2ed01d544680"},"schema_version":"1.0","source":{"id":"2511.15072","kind":"arxiv","version":3}},"canonical_sha256":"4dcf9791ce4743a8d7162fe9cdf582b8bfbc65111c9c968dddbca0c6b83c4cab","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4dcf9791ce4743a8d7162fe9cdf582b8bfbc65111c9c968dddbca0c6b83c4cab","first_computed_at":"2026-06-23T02:13:18.440149Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-23T02:13:18.440149Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ABDTeMwi5ZcfWASkOkGO/N4DRkQIgTBWkwIg6s6uupYI/EAlZiet/otiUeDifSgQYWvi79GLqvD6Nry0HEnnAw==","signature_status":"signed_v1","signed_at":"2026-06-23T02:13:18.440600Z","signed_message":"canonical_sha256_bytes"},"source_id":"2511.15072","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4bdcbeccf68fd84ce5817d8cbf3260bacac16ff5ff992967de9946914416bee7","sha256:480da01d1b9e8ad1852090bb981acd801a17cd8d89a43de9b3ecd49adc354eb4"],"state_sha256":"5828626135e8973e2d973af15853097ca60ebd6cc104fccfb2368ec7f6e1081a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NySVF9pQRCZkAx7jmJ+aGYQB2Pme00kGTV6lNOSaUwjPDoVHiZcJncniEmEB7r9E1VH5bVHsUJTFQDuZ1XmtCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-02T19:52:39.209235Z","bundle_sha256":"e4ad0254345d48973365243b20dc6026ca538aecf6c521fc804b30bcb7c4a2e5"}}