{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:BG732LJJRE3B7WZ6CSC62JI2LS","short_pith_number":"pith:BG732LJJ","canonical_record":{"source":{"id":"1811.04487","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-11-11T21:48:53Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"a975d1e3264b2d454795cb49c0a6c4fd5e2691f9a23e5bcad3ea828af8bde17b","abstract_canon_sha256":"6bfd9a4e091e0599ab04966bbf2f4a0591429da222cfc3b465129bd8396893c6"},"schema_version":"1.0"},"canonical_sha256":"09bfbd2d2989361fdb3e1485ed251a5c89997ff9a9c00a60f2d5576c100ac384","source":{"kind":"arxiv","id":"1811.04487","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.04487","created_at":"2026-05-18T00:01:05Z"},{"alias_kind":"arxiv_version","alias_value":"1811.04487v1","created_at":"2026-05-18T00:01:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.04487","created_at":"2026-05-18T00:01:05Z"},{"alias_kind":"pith_short_12","alias_value":"BG732LJJRE3B","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"BG732LJJRE3B7WZ6","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"BG732LJJ","created_at":"2026-05-18T12:32:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:BG732LJJRE3B7WZ6CSC62JI2LS","target":"record","payload":{"canonical_record":{"source":{"id":"1811.04487","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-11-11T21:48:53Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"a975d1e3264b2d454795cb49c0a6c4fd5e2691f9a23e5bcad3ea828af8bde17b","abstract_canon_sha256":"6bfd9a4e091e0599ab04966bbf2f4a0591429da222cfc3b465129bd8396893c6"},"schema_version":"1.0"},"canonical_sha256":"09bfbd2d2989361fdb3e1485ed251a5c89997ff9a9c00a60f2d5576c100ac384","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:01:05.028954Z","signature_b64":"MBZqKHQO5wOTmNH1c8NmVNVSDn1leiu0zEyVSIhVMGVfgHGFbX4nRXYRMX+oTbiaBLa66YxrzFCrmFSYGpiNAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"09bfbd2d2989361fdb3e1485ed251a5c89997ff9a9c00a60f2d5576c100ac384","last_reissued_at":"2026-05-18T00:01:05.028369Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:01:05.028369Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.04487","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":"2026-05-18T00:01:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tFWN+84fbYapqiAzarYIHOBrA6t0D3aAH9yyEvMxxwKYgZm2TjHOpWZTs+auhBWtL+wu78qol8p6vtpIIAGBAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T16:54:21.408962Z"},"content_sha256":"2428baf2784ac287424d8797cfb38c3badc55e85f6d80c69bfaeedf74fcf20b7","schema_version":"1.0","event_id":"sha256:2428baf2784ac287424d8797cfb38c3badc55e85f6d80c69bfaeedf74fcf20b7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:BG732LJJRE3B7WZ6CSC62JI2LS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Four-Dimensonal Gauss-Bonnet Gravity Without Gauss-Bonnet Coupling to Matter - Spherically Symmetric Solutions, Domain Walls and Spacetime Singularities","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"Eduardo Guendelman, Emil Nissimov, Svetlana Pacheva","submitted_at":"2018-11-11T21:48:53Z","abstract_excerpt":"We discuss a new extended gravity model in ordinary $D=4$ spacetime dimensions, where an additional term in the action involving Gauss-Bonnet topological density is included without the need to couple it to matter fields unlike the case of ordinary D=4 Gauss-Bonnet gravity models. Avoiding the Gauss-Bonnet density becoming a total derivative is achieved by employing the formalism of metric-independent non-Riemannian spacetime volume-forms. The non-Riemannian volume element triggers dynamically the Gauss-Bonnet scalar to become an arbitrary integration constant on-shell. We describe in some det"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.04487","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":"2026-05-18T00:01:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+8Pz8sQGakONDxw3FoOWPmUZ3lLLwLQjDmk/Oln47Dt1ZhQh6sXCcS/opTfGvR9u5xsxWUqKefEqIPQFGeaVDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T16:54:21.409662Z"},"content_sha256":"27285499b2d37bd50e77e7aca4ed65a9f61e15c45ef339afe3232e6b9701eba2","schema_version":"1.0","event_id":"sha256:27285499b2d37bd50e77e7aca4ed65a9f61e15c45ef339afe3232e6b9701eba2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BG732LJJRE3B7WZ6CSC62JI2LS/bundle.json","state_url":"https://pith.science/pith/BG732LJJRE3B7WZ6CSC62JI2LS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BG732LJJRE3B7WZ6CSC62JI2LS/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":"2026-05-27T16:54:21Z","links":{"resolver":"https://pith.science/pith/BG732LJJRE3B7WZ6CSC62JI2LS","bundle":"https://pith.science/pith/BG732LJJRE3B7WZ6CSC62JI2LS/bundle.json","state":"https://pith.science/pith/BG732LJJRE3B7WZ6CSC62JI2LS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BG732LJJRE3B7WZ6CSC62JI2LS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:BG732LJJRE3B7WZ6CSC62JI2LS","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":"6bfd9a4e091e0599ab04966bbf2f4a0591429da222cfc3b465129bd8396893c6","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-11-11T21:48:53Z","title_canon_sha256":"a975d1e3264b2d454795cb49c0a6c4fd5e2691f9a23e5bcad3ea828af8bde17b"},"schema_version":"1.0","source":{"id":"1811.04487","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.04487","created_at":"2026-05-18T00:01:05Z"},{"alias_kind":"arxiv_version","alias_value":"1811.04487v1","created_at":"2026-05-18T00:01:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.04487","created_at":"2026-05-18T00:01:05Z"},{"alias_kind":"pith_short_12","alias_value":"BG732LJJRE3B","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"BG732LJJRE3B7WZ6","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"BG732LJJ","created_at":"2026-05-18T12:32:16Z"}],"graph_snapshots":[{"event_id":"sha256:27285499b2d37bd50e77e7aca4ed65a9f61e15c45ef339afe3232e6b9701eba2","target":"graph","created_at":"2026-05-18T00:01:05Z","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":"We discuss a new extended gravity model in ordinary $D=4$ spacetime dimensions, where an additional term in the action involving Gauss-Bonnet topological density is included without the need to couple it to matter fields unlike the case of ordinary D=4 Gauss-Bonnet gravity models. Avoiding the Gauss-Bonnet density becoming a total derivative is achieved by employing the formalism of metric-independent non-Riemannian spacetime volume-forms. The non-Riemannian volume element triggers dynamically the Gauss-Bonnet scalar to become an arbitrary integration constant on-shell. We describe in some det","authors_text":"Eduardo Guendelman, Emil Nissimov, Svetlana Pacheva","cross_cats":["hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-11-11T21:48:53Z","title":"Four-Dimensonal Gauss-Bonnet Gravity Without Gauss-Bonnet Coupling to Matter - Spherically Symmetric Solutions, Domain Walls and Spacetime Singularities"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.04487","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":"sha256:2428baf2784ac287424d8797cfb38c3badc55e85f6d80c69bfaeedf74fcf20b7","target":"record","created_at":"2026-05-18T00:01:05Z","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":"6bfd9a4e091e0599ab04966bbf2f4a0591429da222cfc3b465129bd8396893c6","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-11-11T21:48:53Z","title_canon_sha256":"a975d1e3264b2d454795cb49c0a6c4fd5e2691f9a23e5bcad3ea828af8bde17b"},"schema_version":"1.0","source":{"id":"1811.04487","kind":"arxiv","version":1}},"canonical_sha256":"09bfbd2d2989361fdb3e1485ed251a5c89997ff9a9c00a60f2d5576c100ac384","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"09bfbd2d2989361fdb3e1485ed251a5c89997ff9a9c00a60f2d5576c100ac384","first_computed_at":"2026-05-18T00:01:05.028369Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:01:05.028369Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MBZqKHQO5wOTmNH1c8NmVNVSDn1leiu0zEyVSIhVMGVfgHGFbX4nRXYRMX+oTbiaBLa66YxrzFCrmFSYGpiNAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:01:05.028954Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.04487","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2428baf2784ac287424d8797cfb38c3badc55e85f6d80c69bfaeedf74fcf20b7","sha256:27285499b2d37bd50e77e7aca4ed65a9f61e15c45ef339afe3232e6b9701eba2"],"state_sha256":"efd99a8b2da96a915c6599d9ee0982dc78217d7a3f11d2cf7cd7c657b225e903"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yP6tquHk6IWjTnmkUnS2Stywz6/egjGVyPecKP7sONg89o9b7DW63UKzHawrMobB8w7YH0pQXlDE5bpnF/crBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T16:54:21.413017Z","bundle_sha256":"1fb24a1dd3904e91ef1026ebf87c5fb53c78652b7c2137da5bb74e2469c219ac"}}