{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:6BICDYMPETRZMTDSNPGTEYUSYR","short_pith_number":"pith:6BICDYMP","canonical_record":{"source":{"id":"1512.00776","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-11-30T21:07:40Z","cross_cats_sorted":[],"title_canon_sha256":"0ac0917e7a53ac2e2c12be33474375f3ad06aed4ecee046cf664e17cc426432e","abstract_canon_sha256":"2e9496f5283df8e4f92194406de5d620e0be23acc4427712ad1497a297b08951"},"schema_version":"1.0"},"canonical_sha256":"f05021e18f24e3964c726bcd326292c47a229b0f006593fe93f3b765d7fca579","source":{"kind":"arxiv","id":"1512.00776","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.00776","created_at":"2026-05-18T01:25:25Z"},{"alias_kind":"arxiv_version","alias_value":"1512.00776v1","created_at":"2026-05-18T01:25:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.00776","created_at":"2026-05-18T01:25:25Z"},{"alias_kind":"pith_short_12","alias_value":"6BICDYMPETRZ","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_16","alias_value":"6BICDYMPETRZMTDS","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_8","alias_value":"6BICDYMP","created_at":"2026-05-18T12:29:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:6BICDYMPETRZMTDSNPGTEYUSYR","target":"record","payload":{"canonical_record":{"source":{"id":"1512.00776","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-11-30T21:07:40Z","cross_cats_sorted":[],"title_canon_sha256":"0ac0917e7a53ac2e2c12be33474375f3ad06aed4ecee046cf664e17cc426432e","abstract_canon_sha256":"2e9496f5283df8e4f92194406de5d620e0be23acc4427712ad1497a297b08951"},"schema_version":"1.0"},"canonical_sha256":"f05021e18f24e3964c726bcd326292c47a229b0f006593fe93f3b765d7fca579","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:25:25.120166Z","signature_b64":"8mm9c7q1MCo8KvjoqhWgllcExC00SPHGJaPOs3hGPxJPzp0XafY+SbSFd8Y3aaDvVgm1k3kT3ICT/UYrTRo8DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f05021e18f24e3964c726bcd326292c47a229b0f006593fe93f3b765d7fca579","last_reissued_at":"2026-05-18T01:25:25.119696Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:25:25.119696Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1512.00776","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":"2026-05-18T01:25:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dR8hDrkgvr3In1HVAj0rrWfpvBGr2os3AFq2/kYueK7tyvCoT0Z64h5ObrmIrJJ59QOqbmvJecgqs11UP3V2AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T07:08:25.675832Z"},"content_sha256":"7b353aabc6d9005a19c58fbe85c3a8c91aad76033d683cc5e29e3698ff5ba1de","schema_version":"1.0","event_id":"sha256:7b353aabc6d9005a19c58fbe85c3a8c91aad76033d683cc5e29e3698ff5ba1de"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:6BICDYMPETRZMTDSNPGTEYUSYR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Free evolution of the hyperboloidal initial value problem in spherical symmetry","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Alex Va\\~n\\'o-Vi\\~nuales","submitted_at":"2015-11-30T21:07:40Z","abstract_excerpt":"The hyperboloidal initial value problem is addressed in the context of Numerical Relativity, motivated by its use of hyperboloidal slices - smooth spacelike slices that reach future null infinity, the \"place\" in spacetime where radiation is to be extracted. This is beneficial for studying the global properties of isolated systems and unambiguously extracting their gravitational radiation. The present approach implements the Einstein equations as a free evolution, using the BSSN and Z4 formulations (standard in current codes) expressed in terms of a conformally rescaled metric as suggested by P"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.00776","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":""},"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":"2026-05-18T01:25:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LxOAQ2VXQ+E5GKi3EkN/DO1S26nhgmvE05OABv5S5mAfK54lwwO+Uvmo7tITHl2f6ZfS9ZE21I/VaLcXquPDCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T07:08:25.676174Z"},"content_sha256":"92c13890b51c9897e12c60863aeafcf44b6c153fad36bf3a9b0b48ad17c699be","schema_version":"1.0","event_id":"sha256:92c13890b51c9897e12c60863aeafcf44b6c153fad36bf3a9b0b48ad17c699be"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6BICDYMPETRZMTDSNPGTEYUSYR/bundle.json","state_url":"https://pith.science/pith/6BICDYMPETRZMTDSNPGTEYUSYR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6BICDYMPETRZMTDSNPGTEYUSYR/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":"2026-06-30T07:08:25Z","links":{"resolver":"https://pith.science/pith/6BICDYMPETRZMTDSNPGTEYUSYR","bundle":"https://pith.science/pith/6BICDYMPETRZMTDSNPGTEYUSYR/bundle.json","state":"https://pith.science/pith/6BICDYMPETRZMTDSNPGTEYUSYR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6BICDYMPETRZMTDSNPGTEYUSYR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:6BICDYMPETRZMTDSNPGTEYUSYR","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":"2e9496f5283df8e4f92194406de5d620e0be23acc4427712ad1497a297b08951","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-11-30T21:07:40Z","title_canon_sha256":"0ac0917e7a53ac2e2c12be33474375f3ad06aed4ecee046cf664e17cc426432e"},"schema_version":"1.0","source":{"id":"1512.00776","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.00776","created_at":"2026-05-18T01:25:25Z"},{"alias_kind":"arxiv_version","alias_value":"1512.00776v1","created_at":"2026-05-18T01:25:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.00776","created_at":"2026-05-18T01:25:25Z"},{"alias_kind":"pith_short_12","alias_value":"6BICDYMPETRZ","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_16","alias_value":"6BICDYMPETRZMTDS","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_8","alias_value":"6BICDYMP","created_at":"2026-05-18T12:29:07Z"}],"graph_snapshots":[{"event_id":"sha256:92c13890b51c9897e12c60863aeafcf44b6c153fad36bf3a9b0b48ad17c699be","target":"graph","created_at":"2026-05-18T01:25:25Z","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":"The hyperboloidal initial value problem is addressed in the context of Numerical Relativity, motivated by its use of hyperboloidal slices - smooth spacelike slices that reach future null infinity, the \"place\" in spacetime where radiation is to be extracted. This is beneficial for studying the global properties of isolated systems and unambiguously extracting their gravitational radiation. The present approach implements the Einstein equations as a free evolution, using the BSSN and Z4 formulations (standard in current codes) expressed in terms of a conformally rescaled metric as suggested by P","authors_text":"Alex Va\\~n\\'o-Vi\\~nuales","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-11-30T21:07:40Z","title":"Free evolution of the hyperboloidal initial value problem in spherical symmetry"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.00776","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":"sha256:7b353aabc6d9005a19c58fbe85c3a8c91aad76033d683cc5e29e3698ff5ba1de","target":"record","created_at":"2026-05-18T01:25:25Z","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":"2e9496f5283df8e4f92194406de5d620e0be23acc4427712ad1497a297b08951","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-11-30T21:07:40Z","title_canon_sha256":"0ac0917e7a53ac2e2c12be33474375f3ad06aed4ecee046cf664e17cc426432e"},"schema_version":"1.0","source":{"id":"1512.00776","kind":"arxiv","version":1}},"canonical_sha256":"f05021e18f24e3964c726bcd326292c47a229b0f006593fe93f3b765d7fca579","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f05021e18f24e3964c726bcd326292c47a229b0f006593fe93f3b765d7fca579","first_computed_at":"2026-05-18T01:25:25.119696Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:25:25.119696Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8mm9c7q1MCo8KvjoqhWgllcExC00SPHGJaPOs3hGPxJPzp0XafY+SbSFd8Y3aaDvVgm1k3kT3ICT/UYrTRo8DQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:25:25.120166Z","signed_message":"canonical_sha256_bytes"},"source_id":"1512.00776","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7b353aabc6d9005a19c58fbe85c3a8c91aad76033d683cc5e29e3698ff5ba1de","sha256:92c13890b51c9897e12c60863aeafcf44b6c153fad36bf3a9b0b48ad17c699be"],"state_sha256":"236c45ae3b11264253732ac4dfe2a91bb5cb93d9fd6c7ac4e82d980c4e5e0320"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"k/D8CgodCZyvyOu6H0Fnlh8JCDyW+4EgD+rGLexmVhW4XmYHdmDP7MG8mqvCilxDizDEiPlTv3eIekVzRCUNCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-30T07:08:25.678075Z","bundle_sha256":"a7c8e5e56fe1cf19e9535c919414d1d1db68c89311695e3b296d335bf5c7cd33"}}