{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:TPLNCNAJQ4XA35NIOFTQH7SRCY","short_pith_number":"pith:TPLNCNAJ","schema_version":"1.0","canonical_sha256":"9bd6d13409872e0df5a8716703fe511605006d0cbee843a1d938fa32000de102","source":{"kind":"arxiv","id":"2608.09929","version":1},"attestation_state":"computed","paper":{"title":"Realization Variance of Gravitational Wave Background Anisotropies from Shot Noise for Pulsar Timing Arrays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.HE","gr-qc"],"primary_cat":"astro-ph.CO","authors_text":"Adam Lidz, Chung-Pei Ma, Meng-Xiang Lin","submitted_at":"2026-08-10T17:59:41Z","abstract_excerpt":"Shot-noise anisotropies in the nHz gravitational wave background (GWB) are a promising target for pulsar timing arrays (PTAs). If the nHz GWB is sourced by merging supermassive black hole binaries (SMBHBs), as current evidence suggests, the shot-noise signal is expected to be large, potentially of order unity at observing frequencies of $f \\sim 1 \\, \\mathrm{yr}^{-1}$. In this regime, the signal is dominated by rare bright binaries, and Poisson fluctuations in the discrete SMBHB population produce significant spatial anisotropies. Here, we use Monte Carlo simulations to model the realization-to"},"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":"2608.09929","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-08-10T17:59:41Z","cross_cats_sorted":["astro-ph.GA","astro-ph.HE","gr-qc"],"title_canon_sha256":"84ff90989f00e897a4b5b2b3f925304f9c20ca3a6f659b5f42c3109739e021da","abstract_canon_sha256":"6e010c79d7c1f5091319297e0f848b62e05f7ef1babaddc8d66380f075636787"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-11T02:25:28.959063Z","signature_b64":"Cy3tVk4i5VER51HyIyETe88P+OrC3+tOdD/liKQeOOdZW8T6PcWyHffLDeFG/p+BqnQPoinubqzIXAeYXWNHDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9bd6d13409872e0df5a8716703fe511605006d0cbee843a1d938fa32000de102","last_reissued_at":"2026-08-11T02:25:28.957490Z","signature_status":"signed_v1","first_computed_at":"2026-08-11T02:25:28.957490Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Realization Variance of Gravitational Wave Background Anisotropies from Shot Noise for Pulsar Timing Arrays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.HE","gr-qc"],"primary_cat":"astro-ph.CO","authors_text":"Adam Lidz, Chung-Pei Ma, Meng-Xiang Lin","submitted_at":"2026-08-10T17:59:41Z","abstract_excerpt":"Shot-noise anisotropies in the nHz gravitational wave background (GWB) are a promising target for pulsar timing arrays (PTAs). If the nHz GWB is sourced by merging supermassive black hole binaries (SMBHBs), as current evidence suggests, the shot-noise signal is expected to be large, potentially of order unity at observing frequencies of $f \\sim 1 \\, \\mathrm{yr}^{-1}$. In this regime, the signal is dominated by rare bright binaries, and Poisson fluctuations in the discrete SMBHB population produce significant spatial anisotropies. Here, we use Monte Carlo simulations to model the realization-to"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.09929","kind":"arxiv","version":1},"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/2608.09929/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":"2608.09929","created_at":"2026-08-11T02:25:28.958132+00:00"},{"alias_kind":"arxiv_version","alias_value":"2608.09929v1","created_at":"2026-08-11T02:25:28.958132+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.09929","created_at":"2026-08-11T02:25:28.958132+00:00"},{"alias_kind":"pith_short_12","alias_value":"TPLNCNAJQ4XA","created_at":"2026-08-11T02:25:28.958132+00:00"},{"alias_kind":"pith_short_16","alias_value":"TPLNCNAJQ4XA35NI","created_at":"2026-08-11T02:25:28.958132+00:00"},{"alias_kind":"pith_short_8","alias_value":"TPLNCNAJ","created_at":"2026-08-11T02:25:28.958132+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/TPLNCNAJQ4XA35NIOFTQH7SRCY","json":"https://pith.science/pith/TPLNCNAJQ4XA35NIOFTQH7SRCY.json","graph_json":"https://pith.science/api/pith-number/TPLNCNAJQ4XA35NIOFTQH7SRCY/graph.json","events_json":"https://pith.science/api/pith-number/TPLNCNAJQ4XA35NIOFTQH7SRCY/events.json","paper":"https://pith.science/paper/TPLNCNAJ"},"agent_actions":{"view_html":"https://pith.science/pith/TPLNCNAJQ4XA35NIOFTQH7SRCY","download_json":"https://pith.science/pith/TPLNCNAJQ4XA35NIOFTQH7SRCY.json","view_paper":"https://pith.science/paper/TPLNCNAJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2608.09929&json=true","fetch_graph":"https://pith.science/api/pith-number/TPLNCNAJQ4XA35NIOFTQH7SRCY/graph.json","fetch_events":"https://pith.science/api/pith-number/TPLNCNAJQ4XA35NIOFTQH7SRCY/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/TPLNCNAJQ4XA35NIOFTQH7SRCY/action/timestamp_anchor","attest_storage":"https://pith.science/pith/TPLNCNAJQ4XA35NIOFTQH7SRCY/action/storage_attestation","attest_author":"https://pith.science/pith/TPLNCNAJQ4XA35NIOFTQH7SRCY/action/author_attestation","sign_citation":"https://pith.science/pith/TPLNCNAJQ4XA35NIOFTQH7SRCY/action/citation_signature","submit_replication":"https://pith.science/pith/TPLNCNAJQ4XA35NIOFTQH7SRCY/action/replication_record"}},"created_at":"2026-08-11T02:25:28.958132+00:00","updated_at":"2026-08-11T02:25:28.958132+00:00"}