{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:TPUOQQOQOD4RASW7P577JKD64Z","short_pith_number":"pith:TPUOQQOQ","canonical_record":{"source":{"id":"1701.07670","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-01-26T12:24:42Z","cross_cats_sorted":[],"title_canon_sha256":"fa2b3ba018eb31d7aeca1ef1465a9ce4c6b3526a368278806f857a92f8014ffd","abstract_canon_sha256":"1e0266325005a45d7ef766e88849432b79c2d829e605644844a8c3532b610c9f"},"schema_version":"1.0"},"canonical_sha256":"9be8e841d070f9104adf7f7ff4a87ee6414a40ac3cf1d59923071f23dcbb1504","source":{"kind":"arxiv","id":"1701.07670","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.07670","created_at":"2026-05-18T00:42:02Z"},{"alias_kind":"arxiv_version","alias_value":"1701.07670v1","created_at":"2026-05-18T00:42:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.07670","created_at":"2026-05-18T00:42:02Z"},{"alias_kind":"pith_short_12","alias_value":"TPUOQQOQOD4R","created_at":"2026-05-18T12:31:46Z"},{"alias_kind":"pith_short_16","alias_value":"TPUOQQOQOD4RASW7","created_at":"2026-05-18T12:31:46Z"},{"alias_kind":"pith_short_8","alias_value":"TPUOQQOQ","created_at":"2026-05-18T12:31:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:TPUOQQOQOD4RASW7P577JKD64Z","target":"record","payload":{"canonical_record":{"source":{"id":"1701.07670","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-01-26T12:24:42Z","cross_cats_sorted":[],"title_canon_sha256":"fa2b3ba018eb31d7aeca1ef1465a9ce4c6b3526a368278806f857a92f8014ffd","abstract_canon_sha256":"1e0266325005a45d7ef766e88849432b79c2d829e605644844a8c3532b610c9f"},"schema_version":"1.0"},"canonical_sha256":"9be8e841d070f9104adf7f7ff4a87ee6414a40ac3cf1d59923071f23dcbb1504","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:42:02.043371Z","signature_b64":"arCU82IAysBYelBS7bpAMqOJmTGnVPdfVi1+9sqOIf5gjD8RBOF0po5Ptdzx21V5BMD/M+Wa+oOjIgHzxe+rCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9be8e841d070f9104adf7f7ff4a87ee6414a40ac3cf1d59923071f23dcbb1504","last_reissued_at":"2026-05-18T00:42:02.042722Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:42:02.042722Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1701.07670","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":"2026-05-18T00:42:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ErVCBr5MEgAqztD/+rwux4bHruU3gih1SbLFAv9m/JpfDDT41WqK2gidTIp+9FuHatSlkuBD3IEh8yKgmD3mCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T21:13:55.358410Z"},"content_sha256":"fcae3cac9e5e7a2d77da4c8bf188d81bc5f33640066c949e6cf93c6446d636f0","schema_version":"1.0","event_id":"sha256:fcae3cac9e5e7a2d77da4c8bf188d81bc5f33640066c949e6cf93c6446d636f0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:TPUOQQOQOD4RASW7P577JKD64Z","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the detection of primordial gravitational waves produced in bouncing models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Arthur Scardua, Nelson Pinto-Neto","submitted_at":"2017-01-26T12:24:42Z","abstract_excerpt":"It is widely known that bouncing models with a dust hydrodynamical fluid satisfying ${c_s^2=p_d/\\rho_d\\approx 0}$, where $c_s, p_d, \\rho_d$ are the sound velocity, pressure and energy density of the dust fluid, respectively, have almost scale invariant spectrum of scalar perturbations and negligible primordial gravitational waves. We investigate whether adding another fluid with $1/3 < \\lambda = p/\\rho < 1$, which should dominate near the bounce, can increase the amplitude of gravitational waves in the high frequency regime, turning them detectable in near future observations for such range of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.07670","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":"2026-05-18T00:42:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SDdFVMtghPhwl/91hCP/va9qoJhp+f5nS8YbKROzFILMaQMePe79oLbYRlnecV9MpTH1IhOXtWBV2pUctNLpDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T21:13:55.358756Z"},"content_sha256":"c8185afca5d467ad470ec7fb1d2e968107e517d557ed311d1b8cc3cb92915670","schema_version":"1.0","event_id":"sha256:c8185afca5d467ad470ec7fb1d2e968107e517d557ed311d1b8cc3cb92915670"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TPUOQQOQOD4RASW7P577JKD64Z/bundle.json","state_url":"https://pith.science/pith/TPUOQQOQOD4RASW7P577JKD64Z/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TPUOQQOQOD4RASW7P577JKD64Z/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":"2026-05-20T21:13:55Z","links":{"resolver":"https://pith.science/pith/TPUOQQOQOD4RASW7P577JKD64Z","bundle":"https://pith.science/pith/TPUOQQOQOD4RASW7P577JKD64Z/bundle.json","state":"https://pith.science/pith/TPUOQQOQOD4RASW7P577JKD64Z/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TPUOQQOQOD4RASW7P577JKD64Z/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:TPUOQQOQOD4RASW7P577JKD64Z","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":"1e0266325005a45d7ef766e88849432b79c2d829e605644844a8c3532b610c9f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-01-26T12:24:42Z","title_canon_sha256":"fa2b3ba018eb31d7aeca1ef1465a9ce4c6b3526a368278806f857a92f8014ffd"},"schema_version":"1.0","source":{"id":"1701.07670","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.07670","created_at":"2026-05-18T00:42:02Z"},{"alias_kind":"arxiv_version","alias_value":"1701.07670v1","created_at":"2026-05-18T00:42:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.07670","created_at":"2026-05-18T00:42:02Z"},{"alias_kind":"pith_short_12","alias_value":"TPUOQQOQOD4R","created_at":"2026-05-18T12:31:46Z"},{"alias_kind":"pith_short_16","alias_value":"TPUOQQOQOD4RASW7","created_at":"2026-05-18T12:31:46Z"},{"alias_kind":"pith_short_8","alias_value":"TPUOQQOQ","created_at":"2026-05-18T12:31:46Z"}],"graph_snapshots":[{"event_id":"sha256:c8185afca5d467ad470ec7fb1d2e968107e517d557ed311d1b8cc3cb92915670","target":"graph","created_at":"2026-05-18T00:42:02Z","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":"It is widely known that bouncing models with a dust hydrodynamical fluid satisfying ${c_s^2=p_d/\\rho_d\\approx 0}$, where $c_s, p_d, \\rho_d$ are the sound velocity, pressure and energy density of the dust fluid, respectively, have almost scale invariant spectrum of scalar perturbations and negligible primordial gravitational waves. We investigate whether adding another fluid with $1/3 < \\lambda = p/\\rho < 1$, which should dominate near the bounce, can increase the amplitude of gravitational waves in the high frequency regime, turning them detectable in near future observations for such range of","authors_text":"Arthur Scardua, Nelson Pinto-Neto","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-01-26T12:24:42Z","title":"On the detection of primordial gravitational waves produced in bouncing models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.07670","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:fcae3cac9e5e7a2d77da4c8bf188d81bc5f33640066c949e6cf93c6446d636f0","target":"record","created_at":"2026-05-18T00:42:02Z","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":"1e0266325005a45d7ef766e88849432b79c2d829e605644844a8c3532b610c9f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-01-26T12:24:42Z","title_canon_sha256":"fa2b3ba018eb31d7aeca1ef1465a9ce4c6b3526a368278806f857a92f8014ffd"},"schema_version":"1.0","source":{"id":"1701.07670","kind":"arxiv","version":1}},"canonical_sha256":"9be8e841d070f9104adf7f7ff4a87ee6414a40ac3cf1d59923071f23dcbb1504","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9be8e841d070f9104adf7f7ff4a87ee6414a40ac3cf1d59923071f23dcbb1504","first_computed_at":"2026-05-18T00:42:02.042722Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:42:02.042722Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"arCU82IAysBYelBS7bpAMqOJmTGnVPdfVi1+9sqOIf5gjD8RBOF0po5Ptdzx21V5BMD/M+Wa+oOjIgHzxe+rCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:42:02.043371Z","signed_message":"canonical_sha256_bytes"},"source_id":"1701.07670","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fcae3cac9e5e7a2d77da4c8bf188d81bc5f33640066c949e6cf93c6446d636f0","sha256:c8185afca5d467ad470ec7fb1d2e968107e517d557ed311d1b8cc3cb92915670"],"state_sha256":"ee20831ae48c073c94a28ea0bfc16440cc63997bc48817d8481f18585ce4c0b6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"okwz5zjaohj5C+yBdaWKVZEspmp6hLzDckLupMhsN4JXkxyAEfFssOX/U1W0ocyuqVPBwA1RSONEaUGPwPQRBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T21:13:55.360773Z","bundle_sha256":"3487dc1e031b2c1b116ed0ce8bdf481e2c426f3ce15576f9bcc47ec59206edd8"}}