{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:QNWHWIK7QSKGOC3S6M3GZL5RQ2","short_pith_number":"pith:QNWHWIK7","canonical_record":{"source":{"id":"2303.16664","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2023-03-29T13:14:50Z","cross_cats_sorted":[],"title_canon_sha256":"83971d4268e55d6d691087cbe8dce6fa2b5581ba2abbb5ee0aa31ae61609e0e0","abstract_canon_sha256":"1b596092e61a87814572e8239c1415f792220bd873622ef3ebe528630742af2a"},"schema_version":"1.0"},"canonical_sha256":"836c7b215f8494670b72f3366cafb186971060493b50761899b74de46e48b9e4","source":{"kind":"arxiv","id":"2303.16664","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2303.16664","created_at":"2026-07-05T06:37:57Z"},{"alias_kind":"arxiv_version","alias_value":"2303.16664v2","created_at":"2026-07-05T06:37:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2303.16664","created_at":"2026-07-05T06:37:57Z"},{"alias_kind":"pith_short_12","alias_value":"QNWHWIK7QSKG","created_at":"2026-07-05T06:37:57Z"},{"alias_kind":"pith_short_16","alias_value":"QNWHWIK7QSKGOC3S","created_at":"2026-07-05T06:37:57Z"},{"alias_kind":"pith_short_8","alias_value":"QNWHWIK7","created_at":"2026-07-05T06:37:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:QNWHWIK7QSKGOC3S6M3GZL5RQ2","target":"record","payload":{"canonical_record":{"source":{"id":"2303.16664","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2023-03-29T13:14:50Z","cross_cats_sorted":[],"title_canon_sha256":"83971d4268e55d6d691087cbe8dce6fa2b5581ba2abbb5ee0aa31ae61609e0e0","abstract_canon_sha256":"1b596092e61a87814572e8239c1415f792220bd873622ef3ebe528630742af2a"},"schema_version":"1.0"},"canonical_sha256":"836c7b215f8494670b72f3366cafb186971060493b50761899b74de46e48b9e4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:37:57.449987Z","signature_b64":"VxmG2Y+zlZHKJeETci6aZyjGFN/cIEKndUEUMCT+2sTX/Zhte9h1it37cYrM384AJfWH5XhKoQCbYKtlfBpDBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"836c7b215f8494670b72f3366cafb186971060493b50761899b74de46e48b9e4","last_reissued_at":"2026-07-05T06:37:57.449478Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:37:57.449478Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2303.16664","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":"2026-07-05T06:37:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FJ4kMXD1jEPPcHqhVQim8rq6naGFuG4Sftf3vp8M3dU9p+1y6FRU9UIW09gn7UUN6W6DiflmKvovjUqnjbzoDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T23:12:21.477958Z"},"content_sha256":"5e793078828b1f94e4ef34e76f205a221f767f35282d6a424bef732da9e4b1fa","schema_version":"1.0","event_id":"sha256:5e793078828b1f94e4ef34e76f205a221f767f35282d6a424bef732da9e4b1fa"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:QNWHWIK7QSKGOC3S6M3GZL5RQ2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Axial and polar stability of neutron stars in scalar-tensor theories with disformal coupling","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Hamza Boumaza","submitted_at":"2023-03-29T13:14:50Z","abstract_excerpt":"In the present work, we study the radial and non-radial perturbative stability of neutron stars in which the matter is disformally coupled to the metric. First, we derive the gravitational and the fluid equations of the neutron star in a static and spherically symmetric background. Then, we calculate the second-order expansion of the action that describes the dynamics of both axial and polar modes. From the resulting expressions, we derive the conditions to avoid gradient and ghost instabilities at the center of the star and at spatial infinity. In addition, a numerical analysis is performed t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2303.16664","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/2303.16664/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":"2026-07-05T06:37:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p29sUQdgkivUF+C2nZCZW5r8OBsJkhdCNZkvMhsRsIAC+LdeiySXUHtwhZSjPqjn812p86EB2vdhcp+/zjdzBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T23:12:21.479175Z"},"content_sha256":"1adbf30f97c91ea9054b5966d28085a68a4a28ba90423e680a3c7eba66de98d3","schema_version":"1.0","event_id":"sha256:1adbf30f97c91ea9054b5966d28085a68a4a28ba90423e680a3c7eba66de98d3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QNWHWIK7QSKGOC3S6M3GZL5RQ2/bundle.json","state_url":"https://pith.science/pith/QNWHWIK7QSKGOC3S6M3GZL5RQ2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QNWHWIK7QSKGOC3S6M3GZL5RQ2/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":"2026-08-13T23:12:21Z","links":{"resolver":"https://pith.science/pith/QNWHWIK7QSKGOC3S6M3GZL5RQ2","bundle":"https://pith.science/pith/QNWHWIK7QSKGOC3S6M3GZL5RQ2/bundle.json","state":"https://pith.science/pith/QNWHWIK7QSKGOC3S6M3GZL5RQ2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QNWHWIK7QSKGOC3S6M3GZL5RQ2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:QNWHWIK7QSKGOC3S6M3GZL5RQ2","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":"1b596092e61a87814572e8239c1415f792220bd873622ef3ebe528630742af2a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2023-03-29T13:14:50Z","title_canon_sha256":"83971d4268e55d6d691087cbe8dce6fa2b5581ba2abbb5ee0aa31ae61609e0e0"},"schema_version":"1.0","source":{"id":"2303.16664","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2303.16664","created_at":"2026-07-05T06:37:57Z"},{"alias_kind":"arxiv_version","alias_value":"2303.16664v2","created_at":"2026-07-05T06:37:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2303.16664","created_at":"2026-07-05T06:37:57Z"},{"alias_kind":"pith_short_12","alias_value":"QNWHWIK7QSKG","created_at":"2026-07-05T06:37:57Z"},{"alias_kind":"pith_short_16","alias_value":"QNWHWIK7QSKGOC3S","created_at":"2026-07-05T06:37:57Z"},{"alias_kind":"pith_short_8","alias_value":"QNWHWIK7","created_at":"2026-07-05T06:37:57Z"}],"graph_snapshots":[{"event_id":"sha256:1adbf30f97c91ea9054b5966d28085a68a4a28ba90423e680a3c7eba66de98d3","target":"graph","created_at":"2026-07-05T06:37:57Z","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/2303.16664/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In the present work, we study the radial and non-radial perturbative stability of neutron stars in which the matter is disformally coupled to the metric. First, we derive the gravitational and the fluid equations of the neutron star in a static and spherically symmetric background. Then, we calculate the second-order expansion of the action that describes the dynamics of both axial and polar modes. From the resulting expressions, we derive the conditions to avoid gradient and ghost instabilities at the center of the star and at spatial infinity. In addition, a numerical analysis is performed t","authors_text":"Hamza Boumaza","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2023-03-29T13:14:50Z","title":"Axial and polar stability of neutron stars in scalar-tensor theories with disformal coupling"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2303.16664","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":"sha256:5e793078828b1f94e4ef34e76f205a221f767f35282d6a424bef732da9e4b1fa","target":"record","created_at":"2026-07-05T06:37:57Z","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":"1b596092e61a87814572e8239c1415f792220bd873622ef3ebe528630742af2a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2023-03-29T13:14:50Z","title_canon_sha256":"83971d4268e55d6d691087cbe8dce6fa2b5581ba2abbb5ee0aa31ae61609e0e0"},"schema_version":"1.0","source":{"id":"2303.16664","kind":"arxiv","version":2}},"canonical_sha256":"836c7b215f8494670b72f3366cafb186971060493b50761899b74de46e48b9e4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"836c7b215f8494670b72f3366cafb186971060493b50761899b74de46e48b9e4","first_computed_at":"2026-07-05T06:37:57.449478Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:37:57.449478Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VxmG2Y+zlZHKJeETci6aZyjGFN/cIEKndUEUMCT+2sTX/Zhte9h1it37cYrM384AJfWH5XhKoQCbYKtlfBpDBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T06:37:57.449987Z","signed_message":"canonical_sha256_bytes"},"source_id":"2303.16664","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5e793078828b1f94e4ef34e76f205a221f767f35282d6a424bef732da9e4b1fa","sha256:1adbf30f97c91ea9054b5966d28085a68a4a28ba90423e680a3c7eba66de98d3"],"state_sha256":"ea44f3d1f95cd8b658db4e0864c6d936055b9f70568b766127ddf7c944beb01c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CEKz5xFugfRWRd8uANGCEsTffB6RIYgBzZSqeZq+LKih5sMDJVkGRzB3SfUUUnNVOo+0mtncPE4YsFuFYZb4BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T23:12:21.521283Z","bundle_sha256":"c0e0b877bd8ff6321d6c1bf0800b1deee975dc7648cf2ed3dfe4ee62f15eff6e"}}