{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:CUJFYEP4KD2CVQAAINLA5YZLOI","short_pith_number":"pith:CUJFYEP4","canonical_record":{"source":{"id":"1902.01468","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-02-04T21:40:11Z","cross_cats_sorted":["astro-ph.CO","hep-th"],"title_canon_sha256":"4626d338a6ab9c574145e126f033842276ad03257ef8cbeaac06bb5adb48e6dd","abstract_canon_sha256":"37d190264676dc032d50b6efd01def382aaa624321f39b9fcaafeec98a30a624"},"schema_version":"1.0"},"canonical_sha256":"15125c11fc50f42ac00043560ee32b720a77d59cf2721f0bdc4e1ea1bad6b41b","source":{"kind":"arxiv","id":"1902.01468","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.01468","created_at":"2026-07-05T00:11:56Z"},{"alias_kind":"arxiv_version","alias_value":"1902.01468v2","created_at":"2026-07-05T00:11:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.01468","created_at":"2026-07-05T00:11:56Z"},{"alias_kind":"pith_short_12","alias_value":"CUJFYEP4KD2C","created_at":"2026-07-05T00:11:56Z"},{"alias_kind":"pith_short_16","alias_value":"CUJFYEP4KD2CVQAA","created_at":"2026-07-05T00:11:56Z"},{"alias_kind":"pith_short_8","alias_value":"CUJFYEP4","created_at":"2026-07-05T00:11:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:CUJFYEP4KD2CVQAAINLA5YZLOI","target":"record","payload":{"canonical_record":{"source":{"id":"1902.01468","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-02-04T21:40:11Z","cross_cats_sorted":["astro-ph.CO","hep-th"],"title_canon_sha256":"4626d338a6ab9c574145e126f033842276ad03257ef8cbeaac06bb5adb48e6dd","abstract_canon_sha256":"37d190264676dc032d50b6efd01def382aaa624321f39b9fcaafeec98a30a624"},"schema_version":"1.0"},"canonical_sha256":"15125c11fc50f42ac00043560ee32b720a77d59cf2721f0bdc4e1ea1bad6b41b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:11:56.447041Z","signature_b64":"8RPDE1sm4e4mSMAUib2ocOmKn9LX8qjdfTof0aUNHk0cSN27/t3WGizeUlPCgPk/fAw8mGKxHKNN7lXa9V70Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"15125c11fc50f42ac00043560ee32b720a77d59cf2721f0bdc4e1ea1bad6b41b","last_reissued_at":"2026-07-05T00:11:56.446584Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:11:56.446584Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1902.01468","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":"2026-07-05T00:11:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YqbdNLtScS2KjMGuWPl0NQ1jHNs6H+ge4tBi06lVV0HZ+hlP8WhmLbRYnYNG6Puv3MGv3wFwfXXftzTM0J+oCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T20:00:51.705348Z"},"content_sha256":"6ce16f3e000eba2b1298d5a71492624de7eb0c35242f18db27a04636c68ff6cf","schema_version":"1.0","event_id":"sha256:6ce16f3e000eba2b1298d5a71492624de7eb0c35242f18db27a04636c68ff6cf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:CUJFYEP4KD2CVQAAINLA5YZLOI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hyperbolicity in Spherical Gravitational Collapse in a Horndeski Theory","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","hep-th"],"primary_cat":"gr-qc","authors_text":"Frans Pretorius, Justin L Ripley","submitted_at":"2019-02-04T21:40:11Z","abstract_excerpt":"We numerically study spherical gravitational collapse in shift symmetric Einstein dilaton Gauss Bonnet (EdGB) gravity. We find evidence that there are open sets of initial data for which the character of the system of equations changes from hyperbolic to elliptic type in a compact region of the spacetime. In these cases evolution of the system, treated as a hyperbolic initial boundary value problem, leads to the equations of motion becoming ill-posed when the elliptic region forms. No singularities or discontinuities are encountered on the corresponding effective \"Cauchy horizon\". Therefore it"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.01468","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/1902.01468/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":"2026-07-05T00:11:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SKIJcr7Mwa/xCtgNU3Dc3nLFyAqnR4P/1J1ZzwLEZM7ENzBcSKZtrS2FvKmPTFcc7befTlfASfLkhe6kdtkvAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T20:00:51.705742Z"},"content_sha256":"79257f5af06a3e4d7f98fb9d6d601ed272c6adad4aeba9fae197ca38597196ff","schema_version":"1.0","event_id":"sha256:79257f5af06a3e4d7f98fb9d6d601ed272c6adad4aeba9fae197ca38597196ff"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CUJFYEP4KD2CVQAAINLA5YZLOI/bundle.json","state_url":"https://pith.science/pith/CUJFYEP4KD2CVQAAINLA5YZLOI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CUJFYEP4KD2CVQAAINLA5YZLOI/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":"2026-08-04T20:00:51Z","links":{"resolver":"https://pith.science/pith/CUJFYEP4KD2CVQAAINLA5YZLOI","bundle":"https://pith.science/pith/CUJFYEP4KD2CVQAAINLA5YZLOI/bundle.json","state":"https://pith.science/pith/CUJFYEP4KD2CVQAAINLA5YZLOI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CUJFYEP4KD2CVQAAINLA5YZLOI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:CUJFYEP4KD2CVQAAINLA5YZLOI","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":"37d190264676dc032d50b6efd01def382aaa624321f39b9fcaafeec98a30a624","cross_cats_sorted":["astro-ph.CO","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-02-04T21:40:11Z","title_canon_sha256":"4626d338a6ab9c574145e126f033842276ad03257ef8cbeaac06bb5adb48e6dd"},"schema_version":"1.0","source":{"id":"1902.01468","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.01468","created_at":"2026-07-05T00:11:56Z"},{"alias_kind":"arxiv_version","alias_value":"1902.01468v2","created_at":"2026-07-05T00:11:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.01468","created_at":"2026-07-05T00:11:56Z"},{"alias_kind":"pith_short_12","alias_value":"CUJFYEP4KD2C","created_at":"2026-07-05T00:11:56Z"},{"alias_kind":"pith_short_16","alias_value":"CUJFYEP4KD2CVQAA","created_at":"2026-07-05T00:11:56Z"},{"alias_kind":"pith_short_8","alias_value":"CUJFYEP4","created_at":"2026-07-05T00:11:56Z"}],"graph_snapshots":[{"event_id":"sha256:79257f5af06a3e4d7f98fb9d6d601ed272c6adad4aeba9fae197ca38597196ff","target":"graph","created_at":"2026-07-05T00:11:56Z","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/1902.01468/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We numerically study spherical gravitational collapse in shift symmetric Einstein dilaton Gauss Bonnet (EdGB) gravity. We find evidence that there are open sets of initial data for which the character of the system of equations changes from hyperbolic to elliptic type in a compact region of the spacetime. In these cases evolution of the system, treated as a hyperbolic initial boundary value problem, leads to the equations of motion becoming ill-posed when the elliptic region forms. No singularities or discontinuities are encountered on the corresponding effective \"Cauchy horizon\". Therefore it","authors_text":"Frans Pretorius, Justin L Ripley","cross_cats":["astro-ph.CO","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-02-04T21:40:11Z","title":"Hyperbolicity in Spherical Gravitational Collapse in a Horndeski Theory"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.01468","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":"sha256:6ce16f3e000eba2b1298d5a71492624de7eb0c35242f18db27a04636c68ff6cf","target":"record","created_at":"2026-07-05T00:11:56Z","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":"37d190264676dc032d50b6efd01def382aaa624321f39b9fcaafeec98a30a624","cross_cats_sorted":["astro-ph.CO","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-02-04T21:40:11Z","title_canon_sha256":"4626d338a6ab9c574145e126f033842276ad03257ef8cbeaac06bb5adb48e6dd"},"schema_version":"1.0","source":{"id":"1902.01468","kind":"arxiv","version":2}},"canonical_sha256":"15125c11fc50f42ac00043560ee32b720a77d59cf2721f0bdc4e1ea1bad6b41b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"15125c11fc50f42ac00043560ee32b720a77d59cf2721f0bdc4e1ea1bad6b41b","first_computed_at":"2026-07-05T00:11:56.446584Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:11:56.446584Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8RPDE1sm4e4mSMAUib2ocOmKn9LX8qjdfTof0aUNHk0cSN27/t3WGizeUlPCgPk/fAw8mGKxHKNN7lXa9V70Cw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:11:56.447041Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.01468","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6ce16f3e000eba2b1298d5a71492624de7eb0c35242f18db27a04636c68ff6cf","sha256:79257f5af06a3e4d7f98fb9d6d601ed272c6adad4aeba9fae197ca38597196ff"],"state_sha256":"80983da7454950cec9b129e986053852974744bee7bc45cd7af747d1022fbfdd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/2WltC4pMIG4vhjGXzvTA2HQ8WZUXAydJM2HDjrlC2zqBbb1nfP3oK+K2vuj1hhHPZ6GG2sUboELZbeXLO08DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T20:00:51.708085Z","bundle_sha256":"6e747f503e21f85aef8578ec779c56fde00c5cd679ec4aeaa86b2de043d6e4a4"}}