{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:ZYDTDWCR3DLUCHLVD6Z6PT3RVL","short_pith_number":"pith:ZYDTDWCR","canonical_record":{"source":{"id":"2502.05513","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-02-08T10:23:59Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"a36fbcad9dbd949f3483ada02565171c81c0f7f4edfe6785db2abbab90acab3b","abstract_canon_sha256":"c4830b4403e4e5fc5e132a263b6158bd2c4f71647f36a29d101b4af97fab6d58"},"schema_version":"1.0"},"canonical_sha256":"ce0731d851d8d7411d751fb3e7cf71aac813b9f13fb993ad4ea0dbf9e6e64307","source":{"kind":"arxiv","id":"2502.05513","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.05513","created_at":"2026-07-05T10:11:39Z"},{"alias_kind":"arxiv_version","alias_value":"2502.05513v1","created_at":"2026-07-05T10:11:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.05513","created_at":"2026-07-05T10:11:39Z"},{"alias_kind":"pith_short_12","alias_value":"ZYDTDWCR3DLU","created_at":"2026-07-05T10:11:39Z"},{"alias_kind":"pith_short_16","alias_value":"ZYDTDWCR3DLUCHLV","created_at":"2026-07-05T10:11:39Z"},{"alias_kind":"pith_short_8","alias_value":"ZYDTDWCR","created_at":"2026-07-05T10:11:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:ZYDTDWCR3DLUCHLVD6Z6PT3RVL","target":"record","payload":{"canonical_record":{"source":{"id":"2502.05513","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-02-08T10:23:59Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"a36fbcad9dbd949f3483ada02565171c81c0f7f4edfe6785db2abbab90acab3b","abstract_canon_sha256":"c4830b4403e4e5fc5e132a263b6158bd2c4f71647f36a29d101b4af97fab6d58"},"schema_version":"1.0"},"canonical_sha256":"ce0731d851d8d7411d751fb3e7cf71aac813b9f13fb993ad4ea0dbf9e6e64307","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:11:39.261285Z","signature_b64":"6pc75lAeZEUqYSnp1kvCykDBXGNVVICFfI0NTCbRzXZYZnyhDxE9ZFpExCv+rwxSb/zHEL2ir4VuIQYfXcsLAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ce0731d851d8d7411d751fb3e7cf71aac813b9f13fb993ad4ea0dbf9e6e64307","last_reissued_at":"2026-07-05T10:11:39.260815Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:11:39.260815Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2502.05513","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:11:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Yr9g1WjV3LgcQ+Ftb5BMksDqJ/edwS6UQoG4SWnIb7t8l2Ai7t/b+jHWCenQ2ItMMKhnGgLqGNKDXYsF+oooCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T10:08:33.672378Z"},"content_sha256":"4e6b23b00b427fd17269efd4e2e7b54a6c77281590cb09cbdaa85194c04d7487","schema_version":"1.0","event_id":"sha256:4e6b23b00b427fd17269efd4e2e7b54a6c77281590cb09cbdaa85194c04d7487"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:ZYDTDWCR3DLUCHLVD6Z6PT3RVL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Equation of State of Neutron Stars: Theoretical Models, Observational Constraints, and Future Perspectives","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"Jiarui Chen, Zuhua Ji","submitted_at":"2025-02-08T10:23:59Z","abstract_excerpt":"Understanding the equation of state (EOS) of neutron stars (NSs) is a fundamental challenge in astrophysics and nuclear physics. A first-order phase transition (FOPT) at high densities could lead to the formation of a quark core, significantly affecting NS properties. This review explores observational and theoretical constraints on such transitions using multi-messenger astrophysics. X-ray observations, including mass-radius measurements from NICER and spectral features like quasi-periodic oscillations (QPOs) and cyclotron resonance scattering features (CRSFs), provide indirect evidence of EO"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.05513","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/2502.05513/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:11:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"um5vx5/YGao2SAha13cSOHbRCOKVjaqH1U7zsagh+bEzxPacrYuIcxxcaT41RuevlTtz8J5b3KZoRQrxtKTRAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T10:08:33.672710Z"},"content_sha256":"d23292506c116ce41420c13ed8ed16ea4004065d0e18e1afb09695041178d11e","schema_version":"1.0","event_id":"sha256:d23292506c116ce41420c13ed8ed16ea4004065d0e18e1afb09695041178d11e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZYDTDWCR3DLUCHLVD6Z6PT3RVL/bundle.json","state_url":"https://pith.science/pith/ZYDTDWCR3DLUCHLVD6Z6PT3RVL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZYDTDWCR3DLUCHLVD6Z6PT3RVL/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":"2026-08-23T10:08:33Z","links":{"resolver":"https://pith.science/pith/ZYDTDWCR3DLUCHLVD6Z6PT3RVL","bundle":"https://pith.science/pith/ZYDTDWCR3DLUCHLVD6Z6PT3RVL/bundle.json","state":"https://pith.science/pith/ZYDTDWCR3DLUCHLVD6Z6PT3RVL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZYDTDWCR3DLUCHLVD6Z6PT3RVL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:ZYDTDWCR3DLUCHLVD6Z6PT3RVL","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":"c4830b4403e4e5fc5e132a263b6158bd2c4f71647f36a29d101b4af97fab6d58","cross_cats_sorted":["gr-qc"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-02-08T10:23:59Z","title_canon_sha256":"a36fbcad9dbd949f3483ada02565171c81c0f7f4edfe6785db2abbab90acab3b"},"schema_version":"1.0","source":{"id":"2502.05513","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.05513","created_at":"2026-07-05T10:11:39Z"},{"alias_kind":"arxiv_version","alias_value":"2502.05513v1","created_at":"2026-07-05T10:11:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.05513","created_at":"2026-07-05T10:11:39Z"},{"alias_kind":"pith_short_12","alias_value":"ZYDTDWCR3DLU","created_at":"2026-07-05T10:11:39Z"},{"alias_kind":"pith_short_16","alias_value":"ZYDTDWCR3DLUCHLV","created_at":"2026-07-05T10:11:39Z"},{"alias_kind":"pith_short_8","alias_value":"ZYDTDWCR","created_at":"2026-07-05T10:11:39Z"}],"graph_snapshots":[{"event_id":"sha256:d23292506c116ce41420c13ed8ed16ea4004065d0e18e1afb09695041178d11e","target":"graph","created_at":"2026-07-05T10:11:39Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2502.05513/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Understanding the equation of state (EOS) of neutron stars (NSs) is a fundamental challenge in astrophysics and nuclear physics. A first-order phase transition (FOPT) at high densities could lead to the formation of a quark core, significantly affecting NS properties. This review explores observational and theoretical constraints on such transitions using multi-messenger astrophysics. X-ray observations, including mass-radius measurements from NICER and spectral features like quasi-periodic oscillations (QPOs) and cyclotron resonance scattering features (CRSFs), provide indirect evidence of EO","authors_text":"Jiarui Chen, Zuhua Ji","cross_cats":["gr-qc"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-02-08T10:23:59Z","title":"The Equation of State of Neutron Stars: Theoretical Models, Observational Constraints, and Future Perspectives"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.05513","kind":"arxiv","version":1},"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":"sha256:4e6b23b00b427fd17269efd4e2e7b54a6c77281590cb09cbdaa85194c04d7487","target":"record","created_at":"2026-07-05T10:11:39Z","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":"c4830b4403e4e5fc5e132a263b6158bd2c4f71647f36a29d101b4af97fab6d58","cross_cats_sorted":["gr-qc"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-02-08T10:23:59Z","title_canon_sha256":"a36fbcad9dbd949f3483ada02565171c81c0f7f4edfe6785db2abbab90acab3b"},"schema_version":"1.0","source":{"id":"2502.05513","kind":"arxiv","version":1}},"canonical_sha256":"ce0731d851d8d7411d751fb3e7cf71aac813b9f13fb993ad4ea0dbf9e6e64307","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ce0731d851d8d7411d751fb3e7cf71aac813b9f13fb993ad4ea0dbf9e6e64307","first_computed_at":"2026-07-05T10:11:39.260815Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:11:39.260815Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6pc75lAeZEUqYSnp1kvCykDBXGNVVICFfI0NTCbRzXZYZnyhDxE9ZFpExCv+rwxSb/zHEL2ir4VuIQYfXcsLAw==","signature_status":"signed_v1","signed_at":"2026-07-05T10:11:39.261285Z","signed_message":"canonical_sha256_bytes"},"source_id":"2502.05513","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4e6b23b00b427fd17269efd4e2e7b54a6c77281590cb09cbdaa85194c04d7487","sha256:d23292506c116ce41420c13ed8ed16ea4004065d0e18e1afb09695041178d11e"],"state_sha256":"410b34a7e35ad8f75c23aff3e73768182e3350add9b56a1026294bcfb914291c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FlvDL9loqDYoN1jkkk51lc6LvPOGfw5ZWSK+ySdcTyZ/EKm+v21elVgLyB6Hf+H3ANL9FIacN87XjdzUwnAEDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T10:08:33.676113Z","bundle_sha256":"733f13cca49e197bfb656b1b9f12f2064d7b42be2ec6ea0245d18d9a470deaa4"}}