{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:XSHDIDWA5AABEFYUUCKMQKTJID","short_pith_number":"pith:XSHDIDWA","canonical_record":{"source":{"id":"1402.4469","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-02-18T20:55:59Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"3b5b523a7885be859689897df56a8e998cb08563d478591db2ebf007ab3d8e6e","abstract_canon_sha256":"6287dab6596e382bf6a3046496c8f2fedd2d8cf3b7e0e9a58bd0d0f57ccbe9ae"},"schema_version":"1.0"},"canonical_sha256":"bc8e340ec0e800121714a094c82a6940eb8fcd1befb3d2b25dcd4f3601b64978","source":{"kind":"arxiv","id":"1402.4469","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.4469","created_at":"2026-05-18T01:44:36Z"},{"alias_kind":"arxiv_version","alias_value":"1402.4469v2","created_at":"2026-05-18T01:44:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.4469","created_at":"2026-05-18T01:44:36Z"},{"alias_kind":"pith_short_12","alias_value":"XSHDIDWA5AAB","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"XSHDIDWA5AABEFYU","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"XSHDIDWA","created_at":"2026-05-18T12:28:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:XSHDIDWA5AABEFYUUCKMQKTJID","target":"record","payload":{"canonical_record":{"source":{"id":"1402.4469","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-02-18T20:55:59Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"3b5b523a7885be859689897df56a8e998cb08563d478591db2ebf007ab3d8e6e","abstract_canon_sha256":"6287dab6596e382bf6a3046496c8f2fedd2d8cf3b7e0e9a58bd0d0f57ccbe9ae"},"schema_version":"1.0"},"canonical_sha256":"bc8e340ec0e800121714a094c82a6940eb8fcd1befb3d2b25dcd4f3601b64978","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:44:36.671943Z","signature_b64":"MTw0k5fgenAju/87+WugI2rFhHLPjK7bRW/kFcbpY/qhPbzhM6IciT2UFLdPVd3QfNa3j2JmdBHH0SuZoTXgDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bc8e340ec0e800121714a094c82a6940eb8fcd1befb3d2b25dcd4f3601b64978","last_reissued_at":"2026-05-18T01:44:36.671512Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:44:36.671512Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1402.4469","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:44:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Lck3QPOx7VdYesRFomTiIOcEHiPwMdqxLHKTN8CBxn5XX0G7OwlTj3bpjcxS92Su/DX9mDQIpfxBIZsLvr2oAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T09:55:27.897480Z"},"content_sha256":"ed086349f590f37d375fce166a8279f36530d3defe215457f0ed99f8331713fd","schema_version":"1.0","event_id":"sha256:ed086349f590f37d375fce166a8279f36530d3defe215457f0ed99f8331713fd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:XSHDIDWA5AABEFYUUCKMQKTJID","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Non-perturbative and self-consistent models of neutron stars in R-squared gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"gr-qc","authors_text":"Daniela D. Doneva, Kalin V. Staykov, Kostas D. Kokkotas, Stoytcho S. Yazadjiev","submitted_at":"2014-02-18T20:55:59Z","abstract_excerpt":"In the present paper we investigate non-perturbatively and self-consistently the structure of neutron stars in $R$-squared gravity by simultaneously solving the interior and exterior problem. The mass-radius relations are obtained for several equations of state and for wide range of the $R$-squared gravity parameter $a$. Even though the deviation from general relativity for nonzero values of $a$ can be large, they are still comparable with the variations due to different modern realistic equations of state. That is why the current observations of the neutron star masses and radii alone can not"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.4469","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:44:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LxgVFu+tMfF88Ci98W2gaTnl4/NXinUmrRX2XMc2ElL4PO4JUDCKSfL0cPnc6gFRZCekbyYcE6Mo+SDPsP9ZBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T09:55:27.898135Z"},"content_sha256":"e3b05ff26e706ca4b76097d287a21536ba63231dffaeee2ce7b0240537c6b765","schema_version":"1.0","event_id":"sha256:e3b05ff26e706ca4b76097d287a21536ba63231dffaeee2ce7b0240537c6b765"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XSHDIDWA5AABEFYUUCKMQKTJID/bundle.json","state_url":"https://pith.science/pith/XSHDIDWA5AABEFYUUCKMQKTJID/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XSHDIDWA5AABEFYUUCKMQKTJID/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-22T09:55:27Z","links":{"resolver":"https://pith.science/pith/XSHDIDWA5AABEFYUUCKMQKTJID","bundle":"https://pith.science/pith/XSHDIDWA5AABEFYUUCKMQKTJID/bundle.json","state":"https://pith.science/pith/XSHDIDWA5AABEFYUUCKMQKTJID/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XSHDIDWA5AABEFYUUCKMQKTJID/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:XSHDIDWA5AABEFYUUCKMQKTJID","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":"6287dab6596e382bf6a3046496c8f2fedd2d8cf3b7e0e9a58bd0d0f57ccbe9ae","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-02-18T20:55:59Z","title_canon_sha256":"3b5b523a7885be859689897df56a8e998cb08563d478591db2ebf007ab3d8e6e"},"schema_version":"1.0","source":{"id":"1402.4469","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.4469","created_at":"2026-05-18T01:44:36Z"},{"alias_kind":"arxiv_version","alias_value":"1402.4469v2","created_at":"2026-05-18T01:44:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.4469","created_at":"2026-05-18T01:44:36Z"},{"alias_kind":"pith_short_12","alias_value":"XSHDIDWA5AAB","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"XSHDIDWA5AABEFYU","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"XSHDIDWA","created_at":"2026-05-18T12:28:57Z"}],"graph_snapshots":[{"event_id":"sha256:e3b05ff26e706ca4b76097d287a21536ba63231dffaeee2ce7b0240537c6b765","target":"graph","created_at":"2026-05-18T01:44:36Z","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"},"paper":{"abstract_excerpt":"In the present paper we investigate non-perturbatively and self-consistently the structure of neutron stars in $R$-squared gravity by simultaneously solving the interior and exterior problem. The mass-radius relations are obtained for several equations of state and for wide range of the $R$-squared gravity parameter $a$. Even though the deviation from general relativity for nonzero values of $a$ can be large, they are still comparable with the variations due to different modern realistic equations of state. That is why the current observations of the neutron star masses and radii alone can not","authors_text":"Daniela D. Doneva, Kalin V. Staykov, Kostas D. Kokkotas, Stoytcho S. Yazadjiev","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-02-18T20:55:59Z","title":"Non-perturbative and self-consistent models of neutron stars in R-squared gravity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.4469","kind":"arxiv","version":2},"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:ed086349f590f37d375fce166a8279f36530d3defe215457f0ed99f8331713fd","target":"record","created_at":"2026-05-18T01:44:36Z","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":"6287dab6596e382bf6a3046496c8f2fedd2d8cf3b7e0e9a58bd0d0f57ccbe9ae","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-02-18T20:55:59Z","title_canon_sha256":"3b5b523a7885be859689897df56a8e998cb08563d478591db2ebf007ab3d8e6e"},"schema_version":"1.0","source":{"id":"1402.4469","kind":"arxiv","version":2}},"canonical_sha256":"bc8e340ec0e800121714a094c82a6940eb8fcd1befb3d2b25dcd4f3601b64978","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bc8e340ec0e800121714a094c82a6940eb8fcd1befb3d2b25dcd4f3601b64978","first_computed_at":"2026-05-18T01:44:36.671512Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:44:36.671512Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MTw0k5fgenAju/87+WugI2rFhHLPjK7bRW/kFcbpY/qhPbzhM6IciT2UFLdPVd3QfNa3j2JmdBHH0SuZoTXgDg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:44:36.671943Z","signed_message":"canonical_sha256_bytes"},"source_id":"1402.4469","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ed086349f590f37d375fce166a8279f36530d3defe215457f0ed99f8331713fd","sha256:e3b05ff26e706ca4b76097d287a21536ba63231dffaeee2ce7b0240537c6b765"],"state_sha256":"5c2a70207f4abe1d553265bdce99de1fa46122e0c8013c4449998896f904af94"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"im/5J89ZvHbUKxLx5KjCldgJDJP/UyZmuODDbBbR0VsWgPgGq6B55IWH5RqwxYhsljEytwD+aJS1CgWTCS5ZCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-22T09:55:27.901769Z","bundle_sha256":"ff489e9bfba0646bc8d29bbf625b877456cacfbf079d19a50846989aa89066b0"}}