{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:B4X6GHXF5SZWZ4I7ZQABRQRN4Y","short_pith_number":"pith:B4X6GHXF","canonical_record":{"source":{"id":"2408.13532","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2024-08-24T09:20:33Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"dbe375ec738be99fcff83d91902aa7bd6dc0fa09be6cfc62c3a5bea667353cf4","abstract_canon_sha256":"2d53f8d5d75802f6b4f9e413347df01853348a594fc6507f0469ac36d5220ebc"},"schema_version":"1.0"},"canonical_sha256":"0f2fe31ee5ecb36cf11fcc0018c22de602c4045f13eb580cd37f5de65030158c","source":{"kind":"arxiv","id":"2408.13532","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2408.13532","created_at":"2026-07-05T08:58:51Z"},{"alias_kind":"arxiv_version","alias_value":"2408.13532v1","created_at":"2026-07-05T08:58:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2408.13532","created_at":"2026-07-05T08:58:51Z"},{"alias_kind":"pith_short_12","alias_value":"B4X6GHXF5SZW","created_at":"2026-07-05T08:58:51Z"},{"alias_kind":"pith_short_16","alias_value":"B4X6GHXF5SZWZ4I7","created_at":"2026-07-05T08:58:51Z"},{"alias_kind":"pith_short_8","alias_value":"B4X6GHXF","created_at":"2026-07-05T08:58:51Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:B4X6GHXF5SZWZ4I7ZQABRQRN4Y","target":"record","payload":{"canonical_record":{"source":{"id":"2408.13532","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2024-08-24T09:20:33Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"dbe375ec738be99fcff83d91902aa7bd6dc0fa09be6cfc62c3a5bea667353cf4","abstract_canon_sha256":"2d53f8d5d75802f6b4f9e413347df01853348a594fc6507f0469ac36d5220ebc"},"schema_version":"1.0"},"canonical_sha256":"0f2fe31ee5ecb36cf11fcc0018c22de602c4045f13eb580cd37f5de65030158c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:58:51.976759Z","signature_b64":"iXl8MNxUC4FpXg+CKqx1XvxyAiCS7elTV5SzU3iE3HimtEm7FsRL/8YjpkopAY0M6h0RH8XR7iG0R8jKFiTrAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0f2fe31ee5ecb36cf11fcc0018c22de602c4045f13eb580cd37f5de65030158c","last_reissued_at":"2026-07-05T08:58:51.976333Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:58:51.976333Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2408.13532","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":"2026-07-05T08:58:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C+8o4J7ftaN1ki6XKpOWsvVS3u4roPj2JCOfvl7694QWsxAX6ws6O13EhLSCJW4wo5H89BrCT0zgdlHOrMeVAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T00:01:32.073108Z"},"content_sha256":"e604e2479bc56ac0e17f94e2974bbc3bc897dfde80c5cc21ec4fa37869dbc16a","schema_version":"1.0","event_id":"sha256:e604e2479bc56ac0e17f94e2974bbc3bc897dfde80c5cc21ec4fa37869dbc16a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:B4X6GHXF5SZWZ4I7ZQABRQRN4Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"FFT-based surrogate modeling of auxetic metamaterials with real-time prediction of effective elastic properties and swift inverse design","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.LG"],"primary_cat":"cs.CE","authors_text":"Daniele Di Lorenzo, Francisco Chinesta, Hooman Danesh, Stefanie Reese, Tim Brepols","submitted_at":"2024-08-24T09:20:33Z","abstract_excerpt":"Auxetic structures, known for their negative Poisson's ratio, exhibit effective elastic properties heavily influenced by their underlying structural geometry and base material properties. While periodic homogenization of auxetic unit cells can be used to investigate these properties, it is computationally expensive and limits design space exploration and inverse analysis. In this paper, surrogate models are developed for the real-time prediction of the effective elastic properties of auxetic unit cells with orthogonal voids of different shapes. The unit cells feature orthogonal voids in four d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2408.13532","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2408.13532/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":"2026-07-05T08:58:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"57DEk9nrTJM4KgBDQtgH4ifMxawe9JnQLJbObcO3QMVxIHWPyuuEEOOipeDxvmKxOPMuY4vL8QJoFGHaW1W0CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T00:01:32.073896Z"},"content_sha256":"c53974111a6846354cd67bad5c65b349aa0dd1c4d839cbffb72adee425e65c7c","schema_version":"1.0","event_id":"sha256:c53974111a6846354cd67bad5c65b349aa0dd1c4d839cbffb72adee425e65c7c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/B4X6GHXF5SZWZ4I7ZQABRQRN4Y/bundle.json","state_url":"https://pith.science/pith/B4X6GHXF5SZWZ4I7ZQABRQRN4Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/B4X6GHXF5SZWZ4I7ZQABRQRN4Y/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":"2026-08-14T00:01:32Z","links":{"resolver":"https://pith.science/pith/B4X6GHXF5SZWZ4I7ZQABRQRN4Y","bundle":"https://pith.science/pith/B4X6GHXF5SZWZ4I7ZQABRQRN4Y/bundle.json","state":"https://pith.science/pith/B4X6GHXF5SZWZ4I7ZQABRQRN4Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/B4X6GHXF5SZWZ4I7ZQABRQRN4Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:B4X6GHXF5SZWZ4I7ZQABRQRN4Y","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":"2d53f8d5d75802f6b4f9e413347df01853348a594fc6507f0469ac36d5220ebc","cross_cats_sorted":["cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2024-08-24T09:20:33Z","title_canon_sha256":"dbe375ec738be99fcff83d91902aa7bd6dc0fa09be6cfc62c3a5bea667353cf4"},"schema_version":"1.0","source":{"id":"2408.13532","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2408.13532","created_at":"2026-07-05T08:58:51Z"},{"alias_kind":"arxiv_version","alias_value":"2408.13532v1","created_at":"2026-07-05T08:58:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2408.13532","created_at":"2026-07-05T08:58:51Z"},{"alias_kind":"pith_short_12","alias_value":"B4X6GHXF5SZW","created_at":"2026-07-05T08:58:51Z"},{"alias_kind":"pith_short_16","alias_value":"B4X6GHXF5SZWZ4I7","created_at":"2026-07-05T08:58:51Z"},{"alias_kind":"pith_short_8","alias_value":"B4X6GHXF","created_at":"2026-07-05T08:58:51Z"}],"graph_snapshots":[{"event_id":"sha256:c53974111a6846354cd67bad5c65b349aa0dd1c4d839cbffb72adee425e65c7c","target":"graph","created_at":"2026-07-05T08:58:51Z","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/2408.13532/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Auxetic structures, known for their negative Poisson's ratio, exhibit effective elastic properties heavily influenced by their underlying structural geometry and base material properties. While periodic homogenization of auxetic unit cells can be used to investigate these properties, it is computationally expensive and limits design space exploration and inverse analysis. In this paper, surrogate models are developed for the real-time prediction of the effective elastic properties of auxetic unit cells with orthogonal voids of different shapes. The unit cells feature orthogonal voids in four d","authors_text":"Daniele Di Lorenzo, Francisco Chinesta, Hooman Danesh, Stefanie Reese, Tim Brepols","cross_cats":["cs.LG"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2024-08-24T09:20:33Z","title":"FFT-based surrogate modeling of auxetic metamaterials with real-time prediction of effective elastic properties and swift inverse design"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2408.13532","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:e604e2479bc56ac0e17f94e2974bbc3bc897dfde80c5cc21ec4fa37869dbc16a","target":"record","created_at":"2026-07-05T08:58:51Z","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":"2d53f8d5d75802f6b4f9e413347df01853348a594fc6507f0469ac36d5220ebc","cross_cats_sorted":["cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2024-08-24T09:20:33Z","title_canon_sha256":"dbe375ec738be99fcff83d91902aa7bd6dc0fa09be6cfc62c3a5bea667353cf4"},"schema_version":"1.0","source":{"id":"2408.13532","kind":"arxiv","version":1}},"canonical_sha256":"0f2fe31ee5ecb36cf11fcc0018c22de602c4045f13eb580cd37f5de65030158c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0f2fe31ee5ecb36cf11fcc0018c22de602c4045f13eb580cd37f5de65030158c","first_computed_at":"2026-07-05T08:58:51.976333Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:58:51.976333Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"iXl8MNxUC4FpXg+CKqx1XvxyAiCS7elTV5SzU3iE3HimtEm7FsRL/8YjpkopAY0M6h0RH8XR7iG0R8jKFiTrAw==","signature_status":"signed_v1","signed_at":"2026-07-05T08:58:51.976759Z","signed_message":"canonical_sha256_bytes"},"source_id":"2408.13532","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e604e2479bc56ac0e17f94e2974bbc3bc897dfde80c5cc21ec4fa37869dbc16a","sha256:c53974111a6846354cd67bad5c65b349aa0dd1c4d839cbffb72adee425e65c7c"],"state_sha256":"b7c23ab180f809a332766e76375ed969933858317c77b6d6b9dd4c4c3a737d28"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"co/0sialrp37v5r9faYkZ+wEBHp35G7i3aJ8HyH4LHs+5aRo+9QGu+2y1omsib5Ohfcl3dPhNa/9GMXrFl7BAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T00:01:32.098776Z","bundle_sha256":"5c47e3b4387c4043c87c9eae3a77349cc25ef0359543a75845ec1bdf7a749a0b"}}