{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:LKAQ3FCYYBG2EZGXLROGOSHIUV","short_pith_number":"pith:LKAQ3FCY","canonical_record":{"source":{"id":"1905.05616","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-05-12T18:00:01Z","cross_cats_sorted":["astro-ph.SR","gr-qc"],"title_canon_sha256":"e471c2ae3c11c282a4e0b4c1e7d251eb44bd93440548a589c1c7f6b28203e72a","abstract_canon_sha256":"04d320ccbdbcb48f58f1f582735df9f2b1319e9b6feb34e60e9d0dc8c69325ec"},"schema_version":"1.0"},"canonical_sha256":"5a810d9458c04da264d75c5c6748e8a5456242c16bf3bbc0f685e53e6448c828","source":{"kind":"arxiv","id":"1905.05616","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.05616","created_at":"2026-07-05T01:31:48Z"},{"alias_kind":"arxiv_version","alias_value":"1905.05616v2","created_at":"2026-07-05T01:31:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.05616","created_at":"2026-07-05T01:31:48Z"},{"alias_kind":"pith_short_12","alias_value":"LKAQ3FCYYBG2","created_at":"2026-07-05T01:31:48Z"},{"alias_kind":"pith_short_16","alias_value":"LKAQ3FCYYBG2EZGX","created_at":"2026-07-05T01:31:48Z"},{"alias_kind":"pith_short_8","alias_value":"LKAQ3FCY","created_at":"2026-07-05T01:31:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:LKAQ3FCYYBG2EZGXLROGOSHIUV","target":"record","payload":{"canonical_record":{"source":{"id":"1905.05616","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-05-12T18:00:01Z","cross_cats_sorted":["astro-ph.SR","gr-qc"],"title_canon_sha256":"e471c2ae3c11c282a4e0b4c1e7d251eb44bd93440548a589c1c7f6b28203e72a","abstract_canon_sha256":"04d320ccbdbcb48f58f1f582735df9f2b1319e9b6feb34e60e9d0dc8c69325ec"},"schema_version":"1.0"},"canonical_sha256":"5a810d9458c04da264d75c5c6748e8a5456242c16bf3bbc0f685e53e6448c828","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:31:48.549750Z","signature_b64":"hS26GjI+pyrdMX5t11B2decgi1QcpkmXCNsuxoLtIqf/QuHqtu+jTYUo5hlDkOhbknxKwUWFVEzHpEXt/ec5DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5a810d9458c04da264d75c5c6748e8a5456242c16bf3bbc0f685e53e6448c828","last_reissued_at":"2026-07-05T01:31:48.549354Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:31:48.549354Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1905.05616","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":"2026-07-05T01:31:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lZOpgJ5J680j4Jj3hGJBV2WH24vXfheOVFPtsmciQDKQUzdlEL6qIPGQQPez2BLD5bBh/e4BS8xoTvuzJL5FBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T17:09:47.657854Z"},"content_sha256":"6c0080ce9e9f10404b1c139c2c5608fc3a5cfaf21761445abff91211c1708c0b","schema_version":"1.0","event_id":"sha256:6c0080ce9e9f10404b1c139c2c5608fc3a5cfaf21761445abff91211c1708c0b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:LKAQ3FCYYBG2EZGXLROGOSHIUV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A new method to constrain neutron star structure from quasi-periodic oscillations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR","gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"Andrea Maselli, George Pappas, Leonardo Gualtieri, Luigi Stella, Paolo Pani, Sara Motta, Valeria Ferrari","submitted_at":"2019-05-12T18:00:01Z","abstract_excerpt":"We develop a new method to measure neutron star parameters and derive constraints on the equation of state of dense matter by fitting the frequencies of simultaneous Quasi Periodic Oscillation modes observed in the X-ray flux of accreting neutron stars in low mass X-ray binaries. To this aim we calculate the fundamental frequencies of geodesic motion around rotating neutron stars based on an accurate general-relativistic approximation for their external spacetime. Once the fundamental frequencies are related to the observed frequencies through a QPO model, they can be fit to the data to obtain"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.05616","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1905.05616/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":"2026-07-05T01:31:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OI8WgvOJ44Uf6Xf6tuw3C+VD/t+g1BEc7Q9BWdznvQ2/sCCDaxcMx0FQ9p8c0N63WaDP+8GbtXyx6pJ2uHm1BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T17:09:47.658364Z"},"content_sha256":"648ce66e80f187af3ec3f3463655cb43b364cd8ffc26e60d1c102f0fee0c3005","schema_version":"1.0","event_id":"sha256:648ce66e80f187af3ec3f3463655cb43b364cd8ffc26e60d1c102f0fee0c3005"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LKAQ3FCYYBG2EZGXLROGOSHIUV/bundle.json","state_url":"https://pith.science/pith/LKAQ3FCYYBG2EZGXLROGOSHIUV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LKAQ3FCYYBG2EZGXLROGOSHIUV/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":"2026-08-07T17:09:47Z","links":{"resolver":"https://pith.science/pith/LKAQ3FCYYBG2EZGXLROGOSHIUV","bundle":"https://pith.science/pith/LKAQ3FCYYBG2EZGXLROGOSHIUV/bundle.json","state":"https://pith.science/pith/LKAQ3FCYYBG2EZGXLROGOSHIUV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LKAQ3FCYYBG2EZGXLROGOSHIUV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:LKAQ3FCYYBG2EZGXLROGOSHIUV","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":"04d320ccbdbcb48f58f1f582735df9f2b1319e9b6feb34e60e9d0dc8c69325ec","cross_cats_sorted":["astro-ph.SR","gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-05-12T18:00:01Z","title_canon_sha256":"e471c2ae3c11c282a4e0b4c1e7d251eb44bd93440548a589c1c7f6b28203e72a"},"schema_version":"1.0","source":{"id":"1905.05616","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.05616","created_at":"2026-07-05T01:31:48Z"},{"alias_kind":"arxiv_version","alias_value":"1905.05616v2","created_at":"2026-07-05T01:31:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.05616","created_at":"2026-07-05T01:31:48Z"},{"alias_kind":"pith_short_12","alias_value":"LKAQ3FCYYBG2","created_at":"2026-07-05T01:31:48Z"},{"alias_kind":"pith_short_16","alias_value":"LKAQ3FCYYBG2EZGX","created_at":"2026-07-05T01:31:48Z"},{"alias_kind":"pith_short_8","alias_value":"LKAQ3FCY","created_at":"2026-07-05T01:31:48Z"}],"graph_snapshots":[{"event_id":"sha256:648ce66e80f187af3ec3f3463655cb43b364cd8ffc26e60d1c102f0fee0c3005","target":"graph","created_at":"2026-07-05T01:31:48Z","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/1905.05616/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We develop a new method to measure neutron star parameters and derive constraints on the equation of state of dense matter by fitting the frequencies of simultaneous Quasi Periodic Oscillation modes observed in the X-ray flux of accreting neutron stars in low mass X-ray binaries. To this aim we calculate the fundamental frequencies of geodesic motion around rotating neutron stars based on an accurate general-relativistic approximation for their external spacetime. Once the fundamental frequencies are related to the observed frequencies through a QPO model, they can be fit to the data to obtain","authors_text":"Andrea Maselli, George Pappas, Leonardo Gualtieri, Luigi Stella, Paolo Pani, Sara Motta, Valeria Ferrari","cross_cats":["astro-ph.SR","gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-05-12T18:00:01Z","title":"A new method to constrain neutron star structure from quasi-periodic oscillations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.05616","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":"sha256:6c0080ce9e9f10404b1c139c2c5608fc3a5cfaf21761445abff91211c1708c0b","target":"record","created_at":"2026-07-05T01:31:48Z","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":"04d320ccbdbcb48f58f1f582735df9f2b1319e9b6feb34e60e9d0dc8c69325ec","cross_cats_sorted":["astro-ph.SR","gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-05-12T18:00:01Z","title_canon_sha256":"e471c2ae3c11c282a4e0b4c1e7d251eb44bd93440548a589c1c7f6b28203e72a"},"schema_version":"1.0","source":{"id":"1905.05616","kind":"arxiv","version":2}},"canonical_sha256":"5a810d9458c04da264d75c5c6748e8a5456242c16bf3bbc0f685e53e6448c828","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5a810d9458c04da264d75c5c6748e8a5456242c16bf3bbc0f685e53e6448c828","first_computed_at":"2026-07-05T01:31:48.549354Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:31:48.549354Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hS26GjI+pyrdMX5t11B2decgi1QcpkmXCNsuxoLtIqf/QuHqtu+jTYUo5hlDkOhbknxKwUWFVEzHpEXt/ec5DA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:31:48.549750Z","signed_message":"canonical_sha256_bytes"},"source_id":"1905.05616","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6c0080ce9e9f10404b1c139c2c5608fc3a5cfaf21761445abff91211c1708c0b","sha256:648ce66e80f187af3ec3f3463655cb43b364cd8ffc26e60d1c102f0fee0c3005"],"state_sha256":"694b3db15e39322a0b3092cc7281a765cc722bea35c88c30bc938ac023a4f51f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JPcdY/sJGMgltfTxDpzSKWFSl/N8UHcym8JEUi3CCbS9mUBxLini4f+wP8JjYkfi44FaSIP3Itpd7+HVjUBICQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T17:09:47.663181Z","bundle_sha256":"f113fe82c0ed822691e2cab5a6db87658bfd0b22153379e55cf1a082bd06fdfc"}}