{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:BJP6VZ7PLCXEUCHFMXDPIAZPR7","short_pith_number":"pith:BJP6VZ7P","canonical_record":{"source":{"id":"1609.05157","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-09-16T17:55:37Z","cross_cats_sorted":[],"title_canon_sha256":"ae84459d995fd8280ab1b7ba1cf19a0227d2351ee6f4d64c4ca092f20135a5bf","abstract_canon_sha256":"f9ed8f7940f4432ababa8f1c2a5e2ebda1f645e4796a8fba50db64cb05764226"},"schema_version":"1.0"},"canonical_sha256":"0a5feae7ef58ae4a08e565c6f4032f8fd5494ffa3d35d6c27eabd17a3b693c45","source":{"kind":"arxiv","id":"1609.05157","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.05157","created_at":"2026-05-18T00:38:31Z"},{"alias_kind":"arxiv_version","alias_value":"1609.05157v1","created_at":"2026-05-18T00:38:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.05157","created_at":"2026-05-18T00:38:31Z"},{"alias_kind":"pith_short_12","alias_value":"BJP6VZ7PLCXE","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_16","alias_value":"BJP6VZ7PLCXEUCHF","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_8","alias_value":"BJP6VZ7P","created_at":"2026-05-18T12:30:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:BJP6VZ7PLCXEUCHFMXDPIAZPR7","target":"record","payload":{"canonical_record":{"source":{"id":"1609.05157","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-09-16T17:55:37Z","cross_cats_sorted":[],"title_canon_sha256":"ae84459d995fd8280ab1b7ba1cf19a0227d2351ee6f4d64c4ca092f20135a5bf","abstract_canon_sha256":"f9ed8f7940f4432ababa8f1c2a5e2ebda1f645e4796a8fba50db64cb05764226"},"schema_version":"1.0"},"canonical_sha256":"0a5feae7ef58ae4a08e565c6f4032f8fd5494ffa3d35d6c27eabd17a3b693c45","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:38:31.171810Z","signature_b64":"lnc15ybZc9utSlgKqs7/xlp3sza4molKm6pkZ0lMeNChoeVgVrzGNDQMePYSvm/Sgjsn3hKACamjdGX5VvV9Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0a5feae7ef58ae4a08e565c6f4032f8fd5494ffa3d35d6c27eabd17a3b693c45","last_reissued_at":"2026-05-18T00:38:31.171196Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:38:31.171196Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1609.05157","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:38:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NFM+DjvnnBxa/LfU3Q4adlZlIFm4bBmIUcKSDycfooaZ+Ai+MVuGSJMcf5h71DqWpHqTrfvPfqPmMFXB9F/TDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T09:24:56.954782Z"},"content_sha256":"dca72ba04065f4531a0ab3e7b6abbd948dd905d0df45f699f765790cfa6c38f1","schema_version":"1.0","event_id":"sha256:dca72ba04065f4531a0ab3e7b6abbd948dd905d0df45f699f765790cfa6c38f1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:BJP6VZ7PLCXEUCHFMXDPIAZPR7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the spatial distribution of neutral hydrogen in the Universe: bias and shot-noise of the HI Power Spectrum","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Emanuele Castorina, Francisco Villaescusa-Navarro","submitted_at":"2016-09-16T17:55:37Z","abstract_excerpt":"The spatial distribution of neutral hydrogen (HI) in the Universe contains a wealth of cosmological information. The 21 cm emission line can be used to map the HI up to very high redshift and therefore reveal us something about the evolution of the large scale structures in the Universe. However little is known about the abundance and clustering properties of the HI over cosmic time. Motivated by this, we build an analytic framework where the relevant parameters that govern how the HI is distributed among dark matter halos can be fixed using observations. At the same time we provide tools to s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.05157","kind":"arxiv","version":1},"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":"2026-05-18T00:38:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nc2GFD8NakFskuIOOMvgyiKhwLVAOf9jpnojqaAj1zssTDpmHzGFjyPga7wif03ElhNvYoNlgS7+OT7BzVNLBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T09:24:56.955140Z"},"content_sha256":"32f465fe76e80898749042d56e7079eecb3efeeb31ec5597d6e05b4fbe9cc615","schema_version":"1.0","event_id":"sha256:32f465fe76e80898749042d56e7079eecb3efeeb31ec5597d6e05b4fbe9cc615"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BJP6VZ7PLCXEUCHFMXDPIAZPR7/bundle.json","state_url":"https://pith.science/pith/BJP6VZ7PLCXEUCHFMXDPIAZPR7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BJP6VZ7PLCXEUCHFMXDPIAZPR7/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":"2026-06-01T09:24:56Z","links":{"resolver":"https://pith.science/pith/BJP6VZ7PLCXEUCHFMXDPIAZPR7","bundle":"https://pith.science/pith/BJP6VZ7PLCXEUCHFMXDPIAZPR7/bundle.json","state":"https://pith.science/pith/BJP6VZ7PLCXEUCHFMXDPIAZPR7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BJP6VZ7PLCXEUCHFMXDPIAZPR7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:BJP6VZ7PLCXEUCHFMXDPIAZPR7","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":"f9ed8f7940f4432ababa8f1c2a5e2ebda1f645e4796a8fba50db64cb05764226","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-09-16T17:55:37Z","title_canon_sha256":"ae84459d995fd8280ab1b7ba1cf19a0227d2351ee6f4d64c4ca092f20135a5bf"},"schema_version":"1.0","source":{"id":"1609.05157","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.05157","created_at":"2026-05-18T00:38:31Z"},{"alias_kind":"arxiv_version","alias_value":"1609.05157v1","created_at":"2026-05-18T00:38:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.05157","created_at":"2026-05-18T00:38:31Z"},{"alias_kind":"pith_short_12","alias_value":"BJP6VZ7PLCXE","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_16","alias_value":"BJP6VZ7PLCXEUCHF","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_8","alias_value":"BJP6VZ7P","created_at":"2026-05-18T12:30:07Z"}],"graph_snapshots":[{"event_id":"sha256:32f465fe76e80898749042d56e7079eecb3efeeb31ec5597d6e05b4fbe9cc615","target":"graph","created_at":"2026-05-18T00:38:31Z","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":"The spatial distribution of neutral hydrogen (HI) in the Universe contains a wealth of cosmological information. The 21 cm emission line can be used to map the HI up to very high redshift and therefore reveal us something about the evolution of the large scale structures in the Universe. However little is known about the abundance and clustering properties of the HI over cosmic time. Motivated by this, we build an analytic framework where the relevant parameters that govern how the HI is distributed among dark matter halos can be fixed using observations. At the same time we provide tools to s","authors_text":"Emanuele Castorina, Francisco Villaescusa-Navarro","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-09-16T17:55:37Z","title":"On the spatial distribution of neutral hydrogen in the Universe: bias and shot-noise of the HI Power Spectrum"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.05157","kind":"arxiv","version":1},"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:dca72ba04065f4531a0ab3e7b6abbd948dd905d0df45f699f765790cfa6c38f1","target":"record","created_at":"2026-05-18T00:38:31Z","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":"f9ed8f7940f4432ababa8f1c2a5e2ebda1f645e4796a8fba50db64cb05764226","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-09-16T17:55:37Z","title_canon_sha256":"ae84459d995fd8280ab1b7ba1cf19a0227d2351ee6f4d64c4ca092f20135a5bf"},"schema_version":"1.0","source":{"id":"1609.05157","kind":"arxiv","version":1}},"canonical_sha256":"0a5feae7ef58ae4a08e565c6f4032f8fd5494ffa3d35d6c27eabd17a3b693c45","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0a5feae7ef58ae4a08e565c6f4032f8fd5494ffa3d35d6c27eabd17a3b693c45","first_computed_at":"2026-05-18T00:38:31.171196Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:38:31.171196Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lnc15ybZc9utSlgKqs7/xlp3sza4molKm6pkZ0lMeNChoeVgVrzGNDQMePYSvm/Sgjsn3hKACamjdGX5VvV9Ag==","signature_status":"signed_v1","signed_at":"2026-05-18T00:38:31.171810Z","signed_message":"canonical_sha256_bytes"},"source_id":"1609.05157","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dca72ba04065f4531a0ab3e7b6abbd948dd905d0df45f699f765790cfa6c38f1","sha256:32f465fe76e80898749042d56e7079eecb3efeeb31ec5597d6e05b4fbe9cc615"],"state_sha256":"5fc0f9181e39be98642ff60f04de6d06efde8ec09e8d4374642fe7a0e295182f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HHR7w/jZbhx7njsF6uXUB7cfa2HRn0eDyaY/s8zVt3Q2mkkrmiVIU3slsZ2JChDHsbDDYYGCa71aQpX7tW+DCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T09:24:56.957015Z","bundle_sha256":"5f1f382d1ab91e9e32a3fddb4a248a704f88670b395474cb2337a24d532f4bf2"}}