{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2014:2F2KKPN6JYN7SWRDWNXV7YGQNY","short_pith_number":"pith:2F2KKPN6","schema_version":"1.0","canonical_sha256":"d174a53dbe4e1bf95a23b36f5fe0d06e1b8f4b25d22d0798b50259793c6734f8","source":{"kind":"arxiv","id":"1412.5453","version":2},"attestation_state":"computed","paper":{"title":"Nonperturbative models of quark stars in $f(R)$ gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","hep-th"],"primary_cat":"gr-qc","authors_text":"A. V. Astashenok, S. Capozziello, S. D. Odintsov","submitted_at":"2014-12-17T15:57:09Z","abstract_excerpt":"Quark star models with realistic equation of state in nonperturbative $f(R)$ gravity are considered. The mass-radius relation for $f(R)=R+\\alpha R^2$ model is obtained. Considering scalar curvature $R$ as an independent function, one can find out, for each value of central density, the unique value of central curvature for which one has solutions with the required asymptotic $R\\rightarrow 0$ for $r\\rightarrow\\infty$. In another words, one needs a fine-tuning for $R$ to achieve quark stars in $f(R)$ gravity. We consider also the analogue description in corresponding scalar-tensor gravity. The f"},"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":"1412.5453","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-12-17T15:57:09Z","cross_cats_sorted":["astro-ph.HE","hep-th"],"title_canon_sha256":"6cd4fd4b25f366193642ab5f7c1ea58c9290a072892c2931533ae54153678588","abstract_canon_sha256":"026949957feedf9aee3823f50ed7665d179b6681f3c60fd51f61841bc55b968f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:41:18.451523Z","signature_b64":"IRnwZLZpxytymMMkeIg4q4xDau9qc8nerOjPZ7dz8gnqisQzpLiMC8fWSqydLrj+hUYWPNbn16XDItWCa2HsCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d174a53dbe4e1bf95a23b36f5fe0d06e1b8f4b25d22d0798b50259793c6734f8","last_reissued_at":"2026-05-18T01:41:18.450863Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:41:18.450863Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Nonperturbative models of quark stars in $f(R)$ gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","hep-th"],"primary_cat":"gr-qc","authors_text":"A. V. Astashenok, S. Capozziello, S. D. Odintsov","submitted_at":"2014-12-17T15:57:09Z","abstract_excerpt":"Quark star models with realistic equation of state in nonperturbative $f(R)$ gravity are considered. The mass-radius relation for $f(R)=R+\\alpha R^2$ model is obtained. Considering scalar curvature $R$ as an independent function, one can find out, for each value of central density, the unique value of central curvature for which one has solutions with the required asymptotic $R\\rightarrow 0$ for $r\\rightarrow\\infty$. In another words, one needs a fine-tuning for $R$ to achieve quark stars in $f(R)$ gravity. We consider also the analogue description in corresponding scalar-tensor gravity. The f"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1412.5453","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":"1412.5453","created_at":"2026-05-18T01:41:18.450952+00:00"},{"alias_kind":"arxiv_version","alias_value":"1412.5453v2","created_at":"2026-05-18T01:41:18.450952+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1412.5453","created_at":"2026-05-18T01:41:18.450952+00:00"},{"alias_kind":"pith_short_12","alias_value":"2F2KKPN6JYN7","created_at":"2026-05-18T12:28:09.283467+00:00"},{"alias_kind":"pith_short_16","alias_value":"2F2KKPN6JYN7SWRD","created_at":"2026-05-18T12:28:09.283467+00:00"},{"alias_kind":"pith_short_8","alias_value":"2F2KKPN6","created_at":"2026-05-18T12:28:09.283467+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/2F2KKPN6JYN7SWRDWNXV7YGQNY","json":"https://pith.science/pith/2F2KKPN6JYN7SWRDWNXV7YGQNY.json","graph_json":"https://pith.science/api/pith-number/2F2KKPN6JYN7SWRDWNXV7YGQNY/graph.json","events_json":"https://pith.science/api/pith-number/2F2KKPN6JYN7SWRDWNXV7YGQNY/events.json","paper":"https://pith.science/paper/2F2KKPN6"},"agent_actions":{"view_html":"https://pith.science/pith/2F2KKPN6JYN7SWRDWNXV7YGQNY","download_json":"https://pith.science/pith/2F2KKPN6JYN7SWRDWNXV7YGQNY.json","view_paper":"https://pith.science/paper/2F2KKPN6","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1412.5453&json=true","fetch_graph":"https://pith.science/api/pith-number/2F2KKPN6JYN7SWRDWNXV7YGQNY/graph.json","fetch_events":"https://pith.science/api/pith-number/2F2KKPN6JYN7SWRDWNXV7YGQNY/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/2F2KKPN6JYN7SWRDWNXV7YGQNY/action/timestamp_anchor","attest_storage":"https://pith.science/pith/2F2KKPN6JYN7SWRDWNXV7YGQNY/action/storage_attestation","attest_author":"https://pith.science/pith/2F2KKPN6JYN7SWRDWNXV7YGQNY/action/author_attestation","sign_citation":"https://pith.science/pith/2F2KKPN6JYN7SWRDWNXV7YGQNY/action/citation_signature","submit_replication":"https://pith.science/pith/2F2KKPN6JYN7SWRDWNXV7YGQNY/action/replication_record"}},"created_at":"2026-05-18T01:41:18.450952+00:00","updated_at":"2026-05-18T01:41:18.450952+00:00"}