{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:72SWWBWOP6PEDWS4HGP3A76OD3","short_pith_number":"pith:72SWWBWO","canonical_record":{"source":{"id":"1509.07562","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-09-24T23:00:32Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"b4ea22d86b2946922c61c86aae832eabf44d4ce917e4067fb83e51a27cb30214","abstract_canon_sha256":"59df61edf38928ddf0bb055c425807e3dac7d3645ae89bb0d8dad4df0739b903"},"schema_version":"1.0"},"canonical_sha256":"fea56b06ce7f9e41da5c399fb07fce1ee9f6c4f75255317be42acabd23761a88","source":{"kind":"arxiv","id":"1509.07562","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.07562","created_at":"2026-05-18T01:22:11Z"},{"alias_kind":"arxiv_version","alias_value":"1509.07562v2","created_at":"2026-05-18T01:22:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.07562","created_at":"2026-05-18T01:22:11Z"},{"alias_kind":"pith_short_12","alias_value":"72SWWBWOP6PE","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_16","alias_value":"72SWWBWOP6PEDWS4","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_8","alias_value":"72SWWBWO","created_at":"2026-05-18T12:29:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:72SWWBWOP6PEDWS4HGP3A76OD3","target":"record","payload":{"canonical_record":{"source":{"id":"1509.07562","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-09-24T23:00:32Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"b4ea22d86b2946922c61c86aae832eabf44d4ce917e4067fb83e51a27cb30214","abstract_canon_sha256":"59df61edf38928ddf0bb055c425807e3dac7d3645ae89bb0d8dad4df0739b903"},"schema_version":"1.0"},"canonical_sha256":"fea56b06ce7f9e41da5c399fb07fce1ee9f6c4f75255317be42acabd23761a88","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:22:11.203384Z","signature_b64":"sCMtl2+zwMzaP/+kaPsdhAcLP4vvcKUwScpdvpReT9Kykh8Ok9e9/STAC0nQyHeLBZRtFpJY9TQ7eKCykusIDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fea56b06ce7f9e41da5c399fb07fce1ee9f6c4f75255317be42acabd23761a88","last_reissued_at":"2026-05-18T01:22:11.202862Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:22:11.202862Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.07562","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":"2026-05-18T01:22:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uLNGJArUSNDPRGBDv5uVuCcZ+YvFdUEzKdWs3KLHBezIzM5KtPbGpUgyp9GVgXxbMCljfvT4L0Z3cT48luaCBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T21:01:08.425802Z"},"content_sha256":"83f8c7fbfbdd01c02d36fbf6a377fc8b77127d175a7d154e39e71084d64d3c48","schema_version":"1.0","event_id":"sha256:83f8c7fbfbdd01c02d36fbf6a377fc8b77127d175a7d154e39e71084d64d3c48"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:72SWWBWOP6PEDWS4HGP3A76OD3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Extending cosmological tests of General Relativity with the Square Kilometre Array","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.CO","authors_text":"Philip Bull","submitted_at":"2015-09-24T23:00:32Z","abstract_excerpt":"Tests of general relativity (GR) are still in their infancy on cosmological scales, but forthcoming experiments promise to greatly improve their precision over a wide range of distance scales and redshifts. One such experiment, the Square Kilometre Array (SKA), will carry out several wide and deep surveys of resolved and unresolved neutral hydrogen (HI) 21cm line-emitting galaxies, mapping a significant fraction of the sky from $0 \\le z \\lesssim 6$. I present forecasts for the ability of a suite of possible SKA HI surveys to detect deviations from GR by reconstructing the cosmic expansion and "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.07562","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":""},"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":"2026-05-18T01:22:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZSRalypAvlNm/MCbzCB5PusBgdbYjVYigW0THxOq+1s50dMfrawueiRWXwRu8hhp1dxn/pFdaIpiABd1va/TAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T21:01:08.426141Z"},"content_sha256":"1d771f19cdfe576a42453ef65c34c7958cbaa0d71285a01a97d6e49ae052eee8","schema_version":"1.0","event_id":"sha256:1d771f19cdfe576a42453ef65c34c7958cbaa0d71285a01a97d6e49ae052eee8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/72SWWBWOP6PEDWS4HGP3A76OD3/bundle.json","state_url":"https://pith.science/pith/72SWWBWOP6PEDWS4HGP3A76OD3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/72SWWBWOP6PEDWS4HGP3A76OD3/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":"2026-06-29T21:01:08Z","links":{"resolver":"https://pith.science/pith/72SWWBWOP6PEDWS4HGP3A76OD3","bundle":"https://pith.science/pith/72SWWBWOP6PEDWS4HGP3A76OD3/bundle.json","state":"https://pith.science/pith/72SWWBWOP6PEDWS4HGP3A76OD3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/72SWWBWOP6PEDWS4HGP3A76OD3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:72SWWBWOP6PEDWS4HGP3A76OD3","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":"59df61edf38928ddf0bb055c425807e3dac7d3645ae89bb0d8dad4df0739b903","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-09-24T23:00:32Z","title_canon_sha256":"b4ea22d86b2946922c61c86aae832eabf44d4ce917e4067fb83e51a27cb30214"},"schema_version":"1.0","source":{"id":"1509.07562","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.07562","created_at":"2026-05-18T01:22:11Z"},{"alias_kind":"arxiv_version","alias_value":"1509.07562v2","created_at":"2026-05-18T01:22:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.07562","created_at":"2026-05-18T01:22:11Z"},{"alias_kind":"pith_short_12","alias_value":"72SWWBWOP6PE","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_16","alias_value":"72SWWBWOP6PEDWS4","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_8","alias_value":"72SWWBWO","created_at":"2026-05-18T12:29:07Z"}],"graph_snapshots":[{"event_id":"sha256:1d771f19cdfe576a42453ef65c34c7958cbaa0d71285a01a97d6e49ae052eee8","target":"graph","created_at":"2026-05-18T01:22:11Z","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":"Tests of general relativity (GR) are still in their infancy on cosmological scales, but forthcoming experiments promise to greatly improve their precision over a wide range of distance scales and redshifts. One such experiment, the Square Kilometre Array (SKA), will carry out several wide and deep surveys of resolved and unresolved neutral hydrogen (HI) 21cm line-emitting galaxies, mapping a significant fraction of the sky from $0 \\le z \\lesssim 6$. I present forecasts for the ability of a suite of possible SKA HI surveys to detect deviations from GR by reconstructing the cosmic expansion and ","authors_text":"Philip Bull","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-09-24T23:00:32Z","title":"Extending cosmological tests of General Relativity with the Square Kilometre Array"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.07562","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":"sha256:83f8c7fbfbdd01c02d36fbf6a377fc8b77127d175a7d154e39e71084d64d3c48","target":"record","created_at":"2026-05-18T01:22:11Z","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":"59df61edf38928ddf0bb055c425807e3dac7d3645ae89bb0d8dad4df0739b903","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-09-24T23:00:32Z","title_canon_sha256":"b4ea22d86b2946922c61c86aae832eabf44d4ce917e4067fb83e51a27cb30214"},"schema_version":"1.0","source":{"id":"1509.07562","kind":"arxiv","version":2}},"canonical_sha256":"fea56b06ce7f9e41da5c399fb07fce1ee9f6c4f75255317be42acabd23761a88","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fea56b06ce7f9e41da5c399fb07fce1ee9f6c4f75255317be42acabd23761a88","first_computed_at":"2026-05-18T01:22:11.202862Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:22:11.202862Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sCMtl2+zwMzaP/+kaPsdhAcLP4vvcKUwScpdvpReT9Kykh8Ok9e9/STAC0nQyHeLBZRtFpJY9TQ7eKCykusIDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:22:11.203384Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.07562","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:83f8c7fbfbdd01c02d36fbf6a377fc8b77127d175a7d154e39e71084d64d3c48","sha256:1d771f19cdfe576a42453ef65c34c7958cbaa0d71285a01a97d6e49ae052eee8"],"state_sha256":"6da29798271f7d7982a0c15ef5a3fcc5b74edcb83be7af2221349781c6d25933"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LggKuyOP/DDb09+cU843W4NGOSpFTb5MWCmdfJkdVk31uJJdkHto5pi4bCCjYUYA7ctRQMddhp4nGfuUg+PIAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-29T21:01:08.428045Z","bundle_sha256":"f2d16849d70fa03e1749a29801e029ac10f17139dd3663a855802e929a3a84e2"}}