{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:ZXRSZUT3WDPKPGIYGR4USQXOL6","short_pith_number":"pith:ZXRSZUT3","schema_version":"1.0","canonical_sha256":"cde32cd27bb0dea7991834794942ee5f902f5f3300bd578bae0093b0a4110547","source":{"kind":"arxiv","id":"1509.00481","version":2},"attestation_state":"computed","paper":{"title":"Non-thermal cosmic neutrino background","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"hep-ph","authors_text":"Andreas Trautner, Michael Ratz, Mu-Chun Chen","submitted_at":"2015-09-01T20:12:51Z","abstract_excerpt":"We point out that, for Dirac neutrinos, in addition to the standard thermal cosmic neutrino background (C$\\nu$B) there could also exist a non-thermal neutrino background with comparable number density. As the right-handed components are essentially decoupled from the thermal bath of standard model particles, relic neutrinos with a non-thermal distribution may exist until today. The relic density of the non-thermal (nt) background can be constrained by the usual observational bounds on the effective number of massless degrees of freedom $N_\\mathrm{eff}$, and can be as large as $n_{\\nu_{\\mathrm{"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1509.00481","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2015-09-01T20:12:51Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"96514e2a508b29c2a5e06389495eda88966227f8c6816fd8347162bbc94b43dc","abstract_canon_sha256":"eadef378474d1d4cea3f5228f97e6ff9128199b4d763f21598c738a79b1cade0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:23:16.182043Z","signature_b64":"BooGmOCi2BUaJC7mVlb5C9/7otXaaonu00rcZnja/k+AwJ0hwel8hPuuECBLSCBfoSSgwB3vG9C21AA9Av8xBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cde32cd27bb0dea7991834794942ee5f902f5f3300bd578bae0093b0a4110547","last_reissued_at":"2026-05-18T01:23:16.181307Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:23:16.181307Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Non-thermal cosmic neutrino background","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"hep-ph","authors_text":"Andreas Trautner, Michael Ratz, Mu-Chun Chen","submitted_at":"2015-09-01T20:12:51Z","abstract_excerpt":"We point out that, for Dirac neutrinos, in addition to the standard thermal cosmic neutrino background (C$\\nu$B) there could also exist a non-thermal neutrino background with comparable number density. As the right-handed components are essentially decoupled from the thermal bath of standard model particles, relic neutrinos with a non-thermal distribution may exist until today. The relic density of the non-thermal (nt) background can be constrained by the usual observational bounds on the effective number of massless degrees of freedom $N_\\mathrm{eff}$, and can be as large as $n_{\\nu_{\\mathrm{"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.00481","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1509.00481","created_at":"2026-05-18T01:23:16.181439+00:00"},{"alias_kind":"arxiv_version","alias_value":"1509.00481v2","created_at":"2026-05-18T01:23:16.181439+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.00481","created_at":"2026-05-18T01:23:16.181439+00:00"},{"alias_kind":"pith_short_12","alias_value":"ZXRSZUT3WDPK","created_at":"2026-05-18T12:29:52.810259+00:00"},{"alias_kind":"pith_short_16","alias_value":"ZXRSZUT3WDPKPGIY","created_at":"2026-05-18T12:29:52.810259+00:00"},{"alias_kind":"pith_short_8","alias_value":"ZXRSZUT3","created_at":"2026-05-18T12:29:52.810259+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/ZXRSZUT3WDPKPGIYGR4USQXOL6","json":"https://pith.science/pith/ZXRSZUT3WDPKPGIYGR4USQXOL6.json","graph_json":"https://pith.science/api/pith-number/ZXRSZUT3WDPKPGIYGR4USQXOL6/graph.json","events_json":"https://pith.science/api/pith-number/ZXRSZUT3WDPKPGIYGR4USQXOL6/events.json","paper":"https://pith.science/paper/ZXRSZUT3"},"agent_actions":{"view_html":"https://pith.science/pith/ZXRSZUT3WDPKPGIYGR4USQXOL6","download_json":"https://pith.science/pith/ZXRSZUT3WDPKPGIYGR4USQXOL6.json","view_paper":"https://pith.science/paper/ZXRSZUT3","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1509.00481&json=true","fetch_graph":"https://pith.science/api/pith-number/ZXRSZUT3WDPKPGIYGR4USQXOL6/graph.json","fetch_events":"https://pith.science/api/pith-number/ZXRSZUT3WDPKPGIYGR4USQXOL6/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/ZXRSZUT3WDPKPGIYGR4USQXOL6/action/timestamp_anchor","attest_storage":"https://pith.science/pith/ZXRSZUT3WDPKPGIYGR4USQXOL6/action/storage_attestation","attest_author":"https://pith.science/pith/ZXRSZUT3WDPKPGIYGR4USQXOL6/action/author_attestation","sign_citation":"https://pith.science/pith/ZXRSZUT3WDPKPGIYGR4USQXOL6/action/citation_signature","submit_replication":"https://pith.science/pith/ZXRSZUT3WDPKPGIYGR4USQXOL6/action/replication_record"}},"created_at":"2026-05-18T01:23:16.181439+00:00","updated_at":"2026-05-18T01:23:16.181439+00:00"}