{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:ZCXPQ6RHZV2P54I4QOKAQKCJEP","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":"00675ce18a2a570614eadd540bf9c5d5c0a55e2502addf9d4aeabb6bc565e81c","cross_cats_sorted":["astro-ph.HE","hep-th"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2023-07-03T17:54:31Z","title_canon_sha256":"8ff1cec358b1e8577612866e4b9a6f5c52baf58b71a67d026c56d5ac12420507"},"schema_version":"1.0","source":{"id":"2307.01192","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2307.01192","created_at":"2026-07-05T07:24:19Z"},{"alias_kind":"arxiv_version","alias_value":"2307.01192v3","created_at":"2026-07-05T07:24:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2307.01192","created_at":"2026-07-05T07:24:19Z"},{"alias_kind":"pith_short_12","alias_value":"ZCXPQ6RHZV2P","created_at":"2026-07-05T07:24:19Z"},{"alias_kind":"pith_short_16","alias_value":"ZCXPQ6RHZV2P54I4","created_at":"2026-07-05T07:24:19Z"},{"alias_kind":"pith_short_8","alias_value":"ZCXPQ6RH","created_at":"2026-07-05T07:24:19Z"}],"graph_snapshots":[{"event_id":"sha256:7bcf71cf73d793aa078d79dea0d75662d8d60e0c9b67d6c295621d64f0e0686d","target":"graph","created_at":"2026-07-05T07:24:19Z","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/2307.01192/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Several pulsar timing arrays including NANOGrav, EPTA, PPTA, and CPTA have recently reported the observation of a stochastic background of gravitational wave spectrum in the nano-Hz frequencies. An inflationary interpretation of this observation is challenging from various aspects. We report that such a signal can arise from the Chern-Simons coupling in axion inflation, where a pseudoscalar inflaton couples to a (massive) $U(1)$ gauge field, leading to efficient production of a transverse gauge mode. Such tachyonic particle production during inflation exponentially enhances the primordial pert","authors_text":"Moinul Hossain Rahat, Xuce Niu","cross_cats":["astro-ph.HE","hep-th"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2023-07-03T17:54:31Z","title":"NANOGrav signal from axion inflation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.01192","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:ef5a2450a85fbe6fa275abf5f1601f64c6b2034887f0c2a0e894d443511cac17","target":"record","created_at":"2026-07-05T07:24:19Z","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":"00675ce18a2a570614eadd540bf9c5d5c0a55e2502addf9d4aeabb6bc565e81c","cross_cats_sorted":["astro-ph.HE","hep-th"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2023-07-03T17:54:31Z","title_canon_sha256":"8ff1cec358b1e8577612866e4b9a6f5c52baf58b71a67d026c56d5ac12420507"},"schema_version":"1.0","source":{"id":"2307.01192","kind":"arxiv","version":3}},"canonical_sha256":"c8aef87a27cd74fef11c839408284923f1e2c60aea056f70e6b7ff7476240a67","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c8aef87a27cd74fef11c839408284923f1e2c60aea056f70e6b7ff7476240a67","first_computed_at":"2026-07-05T07:24:19.615914Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:24:19.615914Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ltNXYhD2toYOX0njSIACWIRJwe3ZI3lq5oamg8xjGvIBXJgUKeIhylztCXmlzOJRWx/M2x8TvrSgzXZoaxumBA==","signature_status":"signed_v1","signed_at":"2026-07-05T07:24:19.616522Z","signed_message":"canonical_sha256_bytes"},"source_id":"2307.01192","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ef5a2450a85fbe6fa275abf5f1601f64c6b2034887f0c2a0e894d443511cac17","sha256:7bcf71cf73d793aa078d79dea0d75662d8d60e0c9b67d6c295621d64f0e0686d"],"state_sha256":"c9ab4c1d6861bfe9fc94037194a18bec2e8ed2dd308f8fad38ad0deae40237ea"}