{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:MLU3W4ALI4ICDULBCEWESTYV67","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":"aafae2173ec78dd4582f1b935176786b3cd4aeab283fd2d64c71837889dafe6f","cross_cats_sorted":["astro-ph.IM","gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-01-16T14:33:23Z","title_canon_sha256":"86c62db7c783b77ff5983fff0fff01667b8555c3ac532a1e6df2207eb3666bdc"},"schema_version":"1.0","source":{"id":"1501.03989","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.03989","created_at":"2026-05-18T01:01:42Z"},{"alias_kind":"arxiv_version","alias_value":"1501.03989v1","created_at":"2026-05-18T01:01:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.03989","created_at":"2026-05-18T01:01:42Z"},{"alias_kind":"pith_short_12","alias_value":"MLU3W4ALI4IC","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_16","alias_value":"MLU3W4ALI4ICDULB","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_8","alias_value":"MLU3W4AL","created_at":"2026-05-18T12:29:32Z"}],"graph_snapshots":[{"event_id":"sha256:82d07a8381caf0ee48656f758dc80a98b0dc433bfbc4223d95f93d3dde3adc67","target":"graph","created_at":"2026-05-18T01:01:42Z","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":"HI intensity mapping (IM) is a novel technique capable of mapping the large-scale structure of the Universe in three dimensions and delivering exquisite constraints on cosmology, by using HI as a biased tracer of the dark matter density field. This is achieved by measuring the intensity of the redshifted 21cm line over the sky in a range of redshifts without the requirement to resolve individual galaxies. In this chapter, we investigate the potential of SKA1 to deliver HI intensity maps over a broad range of frequencies and a substantial fraction of the sky. By pinning down the baryon acoustic","authors_text":"A. Pourtsidou, David Alonso, Filipe B. Abdalla, Francisco Villaescusa-Navarro, Gianni Bernardi, Laura Wolz, Mario G. Santos, Matteo Viel, Matt Jarvis, Pedro G. Ferreira, Philip Bull, R. Benton Metcalf, Roy Maartens, Stefano Camera","cross_cats":["astro-ph.IM","gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-01-16T14:33:23Z","title":"Cosmology with a SKA HI intensity mapping survey"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.03989","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":"sha256:3da435510fac4b87da7b0b39bfbc04b0cb724fd4108d950708b74d69eea9332b","target":"record","created_at":"2026-05-18T01:01:42Z","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":"aafae2173ec78dd4582f1b935176786b3cd4aeab283fd2d64c71837889dafe6f","cross_cats_sorted":["astro-ph.IM","gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-01-16T14:33:23Z","title_canon_sha256":"86c62db7c783b77ff5983fff0fff01667b8555c3ac532a1e6df2207eb3666bdc"},"schema_version":"1.0","source":{"id":"1501.03989","kind":"arxiv","version":1}},"canonical_sha256":"62e9bb700b471021d161112c494f15f7f27eb5edd4fd4028aac6a69ea4bec403","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"62e9bb700b471021d161112c494f15f7f27eb5edd4fd4028aac6a69ea4bec403","first_computed_at":"2026-05-18T01:01:42.448919Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:01:42.448919Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tnhxE3VwG/XSqgjhHuNAIItlHvpls/vaxnpyrZYeCJRh6UpuK+AeYd3+Ygl1Q4iTYvgMUrVU+17ugp2WCKyuAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:01:42.449525Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.03989","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3da435510fac4b87da7b0b39bfbc04b0cb724fd4108d950708b74d69eea9332b","sha256:82d07a8381caf0ee48656f758dc80a98b0dc433bfbc4223d95f93d3dde3adc67"],"state_sha256":"dbfbfcc2db3624dbae28f197c01e7a6b17ba1f204560b00b7ad476f590d7ce51"}