{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:4DRC22CNE57HCOQPUNZKZSUPSU","short_pith_number":"pith:4DRC22CN","schema_version":"1.0","canonical_sha256":"e0e22d684d277e713a0fa372acca8f951ec77c40a04ca0c8b733ada6a774a69c","source":{"kind":"arxiv","id":"2104.08750","version":2},"attestation_state":"computed","paper":{"title":"Looking at the NANOGrav Signal Through the Anthropic Window of Axion-Like Particles","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","gr-qc","hep-th"],"primary_cat":"hep-ph","authors_text":"Alexander S. Sakharov, Sergey G. Rubin, Yury N. Eroshenko","submitted_at":"2021-04-18T07:22:06Z","abstract_excerpt":"We explore the inflationary dynamics leading to formation of closed domain walls in course of evolution of an axion like particle (ALP) field whose Peccei-Quinn-like phase transition occurred well before inflationary epoch. Evolving after inflation, the domain walls may leave their imprint in stochastic gravitational waves background, in the frequency range accessible for the pulsar timing array measurements. We derive the characteristic strain power spectrum produced by the distribution of the closed domain walls and relate it with the recently reported NANOGrav signal excess. We found that t"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2104.08750","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2021-04-18T07:22:06Z","cross_cats_sorted":["astro-ph.CO","gr-qc","hep-th"],"title_canon_sha256":"e8fbea6b908465604e5d9fde7521380f38c3f30d29db99d498e51dc99d3e70d1","abstract_canon_sha256":"da99395303ba0fadcf3894f887d89dd3a539adadad5758a1a8fc1da8a70aa67d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:04:50.685636Z","signature_b64":"riapiPR+vEzpHHlveLOJCfpv1RXU62Bt77jHGm9i1VoTeEeC/MgGM9GbbgYqEpV3y0Ej80yc4oA5O2hYK62PBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e0e22d684d277e713a0fa372acca8f951ec77c40a04ca0c8b733ada6a774a69c","last_reissued_at":"2026-07-05T03:04:50.685137Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:04:50.685137Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Looking at the NANOGrav Signal Through the Anthropic Window of Axion-Like Particles","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","gr-qc","hep-th"],"primary_cat":"hep-ph","authors_text":"Alexander S. Sakharov, Sergey G. Rubin, Yury N. Eroshenko","submitted_at":"2021-04-18T07:22:06Z","abstract_excerpt":"We explore the inflationary dynamics leading to formation of closed domain walls in course of evolution of an axion like particle (ALP) field whose Peccei-Quinn-like phase transition occurred well before inflationary epoch. Evolving after inflation, the domain walls may leave their imprint in stochastic gravitational waves background, in the frequency range accessible for the pulsar timing array measurements. We derive the characteristic strain power spectrum produced by the distribution of the closed domain walls and relate it with the recently reported NANOGrav signal excess. We found that t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.08750","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/2104.08750/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2104.08750","created_at":"2026-07-05T03:04:50.685196+00:00"},{"alias_kind":"arxiv_version","alias_value":"2104.08750v2","created_at":"2026-07-05T03:04:50.685196+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.08750","created_at":"2026-07-05T03:04:50.685196+00:00"},{"alias_kind":"pith_short_12","alias_value":"4DRC22CNE57H","created_at":"2026-07-05T03:04:50.685196+00:00"},{"alias_kind":"pith_short_16","alias_value":"4DRC22CNE57HCOQP","created_at":"2026-07-05T03:04:50.685196+00:00"},{"alias_kind":"pith_short_8","alias_value":"4DRC22CN","created_at":"2026-07-05T03:04:50.685196+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"2604.25726","citing_title":"Imprint of domain wall annihilation on induced gravitational waves","ref_index":44,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/4DRC22CNE57HCOQPUNZKZSUPSU","json":"https://pith.science/pith/4DRC22CNE57HCOQPUNZKZSUPSU.json","graph_json":"https://pith.science/api/pith-number/4DRC22CNE57HCOQPUNZKZSUPSU/graph.json","events_json":"https://pith.science/api/pith-number/4DRC22CNE57HCOQPUNZKZSUPSU/events.json","paper":"https://pith.science/paper/4DRC22CN"},"agent_actions":{"view_html":"https://pith.science/pith/4DRC22CNE57HCOQPUNZKZSUPSU","download_json":"https://pith.science/pith/4DRC22CNE57HCOQPUNZKZSUPSU.json","view_paper":"https://pith.science/paper/4DRC22CN","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2104.08750&json=true","fetch_graph":"https://pith.science/api/pith-number/4DRC22CNE57HCOQPUNZKZSUPSU/graph.json","fetch_events":"https://pith.science/api/pith-number/4DRC22CNE57HCOQPUNZKZSUPSU/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/4DRC22CNE57HCOQPUNZKZSUPSU/action/timestamp_anchor","attest_storage":"https://pith.science/pith/4DRC22CNE57HCOQPUNZKZSUPSU/action/storage_attestation","attest_author":"https://pith.science/pith/4DRC22CNE57HCOQPUNZKZSUPSU/action/author_attestation","sign_citation":"https://pith.science/pith/4DRC22CNE57HCOQPUNZKZSUPSU/action/citation_signature","submit_replication":"https://pith.science/pith/4DRC22CNE57HCOQPUNZKZSUPSU/action/replication_record"}},"created_at":"2026-07-05T03:04:50.685196+00:00","updated_at":"2026-07-05T03:04:50.685196+00:00"}