{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:ENIIS3PS2O7N7AXXQGLS2XNOHH","short_pith_number":"pith:ENIIS3PS","canonical_record":{"source":{"id":"0801.1677","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2008-01-10T21:09:04Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"b7b1dccc8c8c57afe7b03f1092b195d1e40fd12501ca9c8cc5d90f290245d163","abstract_canon_sha256":"3ffce26d50a71eda71efc95904a2d628ba5b387e5fdebe05db83c2d2f611b606"},"schema_version":"1.0"},"canonical_sha256":"2350896df2d3bedf82f781972d5dae39ca8d3921b95a931537ab768f7a616b9e","source":{"kind":"arxiv","id":"0801.1677","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0801.1677","created_at":"2026-07-04T15:44:38Z"},{"alias_kind":"arxiv_version","alias_value":"0801.1677v2","created_at":"2026-07-04T15:44:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0801.1677","created_at":"2026-07-04T15:44:38Z"},{"alias_kind":"pith_short_12","alias_value":"ENIIS3PS2O7N","created_at":"2026-07-04T15:44:38Z"},{"alias_kind":"pith_short_16","alias_value":"ENIIS3PS2O7N7AXX","created_at":"2026-07-04T15:44:38Z"},{"alias_kind":"pith_short_8","alias_value":"ENIIS3PS","created_at":"2026-07-04T15:44:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:ENIIS3PS2O7N7AXXQGLS2XNOHH","target":"record","payload":{"canonical_record":{"source":{"id":"0801.1677","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2008-01-10T21:09:04Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"b7b1dccc8c8c57afe7b03f1092b195d1e40fd12501ca9c8cc5d90f290245d163","abstract_canon_sha256":"3ffce26d50a71eda71efc95904a2d628ba5b387e5fdebe05db83c2d2f611b606"},"schema_version":"1.0"},"canonical_sha256":"2350896df2d3bedf82f781972d5dae39ca8d3921b95a931537ab768f7a616b9e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:44:38.904452Z","signature_b64":"q5HVhGMYB2jRDpE0lNFZHSKOveEpq/OkqIB2f0NN4tLfM0MvfT73oLIDf3dFsbtuiocXRPI0digatC22PvJlBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2350896df2d3bedf82f781972d5dae39ca8d3921b95a931537ab768f7a616b9e","last_reissued_at":"2026-07-04T15:44:38.904026Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:44:38.904026Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0801.1677","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":"2026-07-04T15:44:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2wOeVqKcpx7MigFTykVkPhphDc4zEEebcWZM7m6fCEYEeAXnKNPVx5EONhzpRd5YGVNeeBqP3UpitW5+5uHnAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T14:09:43.795095Z"},"content_sha256":"ebac00294a68f01725eaceeea52dcc863d6363a16f7b19961ad920e37a2f6430","schema_version":"1.0","event_id":"sha256:ebac00294a68f01725eaceeea52dcc863d6363a16f7b19961ad920e37a2f6430"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:ENIIS3PS2O7N7AXXQGLS2XNOHH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization","license":"","headline":"","cross_cats":["hep-ph"],"primary_cat":"astro-ph","authors_text":"Abraham Loeb (Harvard), Stuart Wyithe (Melbourne)","submitted_at":"2008-01-10T21:09:04Z","abstract_excerpt":"Measurements of the 21cm line emission by residual cosmic hydrogen after reionization can be used to trace the power spectrum of density perturbations through a significant fraction of the observable volume of the Universe. We show that a dedicated 21cm observatory coule probe a number of independent modes that is two orders of magnitude larger than currently available, and enable a cosmic-variance limited detection of the signature of a neutrino mass ~0.05eV. The evolution of the linear growth factor with redshift could also constrain exotic theories of gravity or dark energy to an unpreceden"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0801.1677","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/0801.1677/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":"2026-07-04T15:44:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tVy97Zwk+1zoyf43ajkC4Ww61TjxoNEjljgfAtQ/6qByG+YNBf43HwuUmUQszjFcULd5pJGad2vVAsL6/qWWDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T14:09:43.795676Z"},"content_sha256":"ebfc2d09c692ea597badbea667d76ed17ac638d7907f803fae3cf7331c2c9071","schema_version":"1.0","event_id":"sha256:ebfc2d09c692ea597badbea667d76ed17ac638d7907f803fae3cf7331c2c9071"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ENIIS3PS2O7N7AXXQGLS2XNOHH/bundle.json","state_url":"https://pith.science/pith/ENIIS3PS2O7N7AXXQGLS2XNOHH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ENIIS3PS2O7N7AXXQGLS2XNOHH/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":"2026-08-10T14:09:43Z","links":{"resolver":"https://pith.science/pith/ENIIS3PS2O7N7AXXQGLS2XNOHH","bundle":"https://pith.science/pith/ENIIS3PS2O7N7AXXQGLS2XNOHH/bundle.json","state":"https://pith.science/pith/ENIIS3PS2O7N7AXXQGLS2XNOHH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ENIIS3PS2O7N7AXXQGLS2XNOHH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:ENIIS3PS2O7N7AXXQGLS2XNOHH","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":"3ffce26d50a71eda71efc95904a2d628ba5b387e5fdebe05db83c2d2f611b606","cross_cats_sorted":["hep-ph"],"license":"","primary_cat":"astro-ph","submitted_at":"2008-01-10T21:09:04Z","title_canon_sha256":"b7b1dccc8c8c57afe7b03f1092b195d1e40fd12501ca9c8cc5d90f290245d163"},"schema_version":"1.0","source":{"id":"0801.1677","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0801.1677","created_at":"2026-07-04T15:44:38Z"},{"alias_kind":"arxiv_version","alias_value":"0801.1677v2","created_at":"2026-07-04T15:44:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0801.1677","created_at":"2026-07-04T15:44:38Z"},{"alias_kind":"pith_short_12","alias_value":"ENIIS3PS2O7N","created_at":"2026-07-04T15:44:38Z"},{"alias_kind":"pith_short_16","alias_value":"ENIIS3PS2O7N7AXX","created_at":"2026-07-04T15:44:38Z"},{"alias_kind":"pith_short_8","alias_value":"ENIIS3PS","created_at":"2026-07-04T15:44:38Z"}],"graph_snapshots":[{"event_id":"sha256:ebfc2d09c692ea597badbea667d76ed17ac638d7907f803fae3cf7331c2c9071","target":"graph","created_at":"2026-07-04T15:44:38Z","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/0801.1677/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Measurements of the 21cm line emission by residual cosmic hydrogen after reionization can be used to trace the power spectrum of density perturbations through a significant fraction of the observable volume of the Universe. We show that a dedicated 21cm observatory coule probe a number of independent modes that is two orders of magnitude larger than currently available, and enable a cosmic-variance limited detection of the signature of a neutrino mass ~0.05eV. The evolution of the linear growth factor with redshift could also constrain exotic theories of gravity or dark energy to an unpreceden","authors_text":"Abraham Loeb (Harvard), Stuart Wyithe (Melbourne)","cross_cats":["hep-ph"],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2008-01-10T21:09:04Z","title":"Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0801.1677","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:ebac00294a68f01725eaceeea52dcc863d6363a16f7b19961ad920e37a2f6430","target":"record","created_at":"2026-07-04T15:44:38Z","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":"3ffce26d50a71eda71efc95904a2d628ba5b387e5fdebe05db83c2d2f611b606","cross_cats_sorted":["hep-ph"],"license":"","primary_cat":"astro-ph","submitted_at":"2008-01-10T21:09:04Z","title_canon_sha256":"b7b1dccc8c8c57afe7b03f1092b195d1e40fd12501ca9c8cc5d90f290245d163"},"schema_version":"1.0","source":{"id":"0801.1677","kind":"arxiv","version":2}},"canonical_sha256":"2350896df2d3bedf82f781972d5dae39ca8d3921b95a931537ab768f7a616b9e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2350896df2d3bedf82f781972d5dae39ca8d3921b95a931537ab768f7a616b9e","first_computed_at":"2026-07-04T15:44:38.904026Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:44:38.904026Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"q5HVhGMYB2jRDpE0lNFZHSKOveEpq/OkqIB2f0NN4tLfM0MvfT73oLIDf3dFsbtuiocXRPI0digatC22PvJlBw==","signature_status":"signed_v1","signed_at":"2026-07-04T15:44:38.904452Z","signed_message":"canonical_sha256_bytes"},"source_id":"0801.1677","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ebac00294a68f01725eaceeea52dcc863d6363a16f7b19961ad920e37a2f6430","sha256:ebfc2d09c692ea597badbea667d76ed17ac638d7907f803fae3cf7331c2c9071"],"state_sha256":"a8f9731ecc3ab44c89a80af16ae480415c645c78692a02cb05d97ae08fbe07a9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rWiQIDpMksV1NLWZHDdI6BwaEQCZcD5u+ezOqXly3BM+3wN2nh3O0Dt4VE+41nmOGf6M96gJ7mPSvd2rLpVKCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T14:09:43.801348Z","bundle_sha256":"c06fc136a66fed24309fb35a2bda61214f17d53fa308dc43b7630c1f1345fe7c"}}