{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:VMHV47GBJMBBDC4XVLKEAFNNIG","short_pith_number":"pith:VMHV47GB","canonical_record":{"source":{"id":"2505.23481","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2025-05-29T14:30:17Z","cross_cats_sorted":[],"title_canon_sha256":"58fe5062e6aac3ef24087bfe992bdf9b537656822181438fcceac465f6f7e987","abstract_canon_sha256":"0ff291930e83a2732c8cf6a5ded7a824ef52a59cad391b9e6712fc9e4211c71b"},"schema_version":"1.0"},"canonical_sha256":"ab0f5e7cc14b02118b97aad44015ad418556ae0c88cd6492edc367423e7981c2","source":{"kind":"arxiv","id":"2505.23481","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.23481","created_at":"2026-07-05T11:25:11Z"},{"alias_kind":"arxiv_version","alias_value":"2505.23481v2","created_at":"2026-07-05T11:25:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.23481","created_at":"2026-07-05T11:25:11Z"},{"alias_kind":"pith_short_12","alias_value":"VMHV47GBJMBB","created_at":"2026-07-05T11:25:11Z"},{"alias_kind":"pith_short_16","alias_value":"VMHV47GBJMBBDC4X","created_at":"2026-07-05T11:25:11Z"},{"alias_kind":"pith_short_8","alias_value":"VMHV47GB","created_at":"2026-07-05T11:25:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:VMHV47GBJMBBDC4XVLKEAFNNIG","target":"record","payload":{"canonical_record":{"source":{"id":"2505.23481","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2025-05-29T14:30:17Z","cross_cats_sorted":[],"title_canon_sha256":"58fe5062e6aac3ef24087bfe992bdf9b537656822181438fcceac465f6f7e987","abstract_canon_sha256":"0ff291930e83a2732c8cf6a5ded7a824ef52a59cad391b9e6712fc9e4211c71b"},"schema_version":"1.0"},"canonical_sha256":"ab0f5e7cc14b02118b97aad44015ad418556ae0c88cd6492edc367423e7981c2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:25:11.433073Z","signature_b64":"jmXuJuxCX7rH4SdI+vYdxDZiFJHYhwK+4uj7oDhCvTjzK5VLkIXy2Ae+nnEYTRqiRmCIkJNOVOm21lABsUCvCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ab0f5e7cc14b02118b97aad44015ad418556ae0c88cd6492edc367423e7981c2","last_reissued_at":"2026-07-05T11:25:11.432586Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:25:11.432586Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2505.23481","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":"2026-07-05T11:25:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EljbJRM/ZEzWToY8NcDQ09sei3MrGScU2Q64ttMYKXMCrtA1RKV5hKwewdNoZhEJHdfvteFGE24Z1JsXN3MgDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T01:34:18.901784Z"},"content_sha256":"e6ff235d75c7df8bddd78b1b5693ca1980dee154fe0b5f591c8125af25de1626","schema_version":"1.0","event_id":"sha256:e6ff235d75c7df8bddd78b1b5693ca1980dee154fe0b5f591c8125af25de1626"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:VMHV47GBJMBBDC4XVLKEAFNNIG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"PhysicsNeRF: Physics-Guided 3D Reconstruction from Sparse Views","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Hasan Kurban, Hussein Alnuweiri, Mohamed Rayan Barhdadi","submitted_at":"2025-05-29T14:30:17Z","abstract_excerpt":"PhysicsNeRF is a physically grounded framework for 3D reconstruction from sparse views, extending Neural Radiance Fields with four complementary constraints: depth ranking, RegNeRF-style consistency, sparsity priors, and cross-view alignment. While standard NeRFs fail under sparse supervision, PhysicsNeRF employs a compact 0.67M-parameter architecture and achieves 21.4 dB average PSNR using only 8 views, outperforming prior methods. A generalization gap of 5.7-6.2 dB is consistently observed and analyzed, revealing fundamental limitations of sparse-view reconstruction. PhysicsNeRF enables phys"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.23481","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/2505.23481/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":"2026-07-05T11:25:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3RyHFGRliZxYlmCLIs+ZHkE4mvz9r4/Oppc+z1PiVTUQ3gUr/pQ1ImV6dFUiS5NTUrX49POQm5ZqwNXMf8VdDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T01:34:18.902338Z"},"content_sha256":"8e0b9f980c4ecd281c2e255f778a84066da11fc8a55400d3868aba5cb23f7f48","schema_version":"1.0","event_id":"sha256:8e0b9f980c4ecd281c2e255f778a84066da11fc8a55400d3868aba5cb23f7f48"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VMHV47GBJMBBDC4XVLKEAFNNIG/bundle.json","state_url":"https://pith.science/pith/VMHV47GBJMBBDC4XVLKEAFNNIG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VMHV47GBJMBBDC4XVLKEAFNNIG/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":"2026-08-08T01:34:18Z","links":{"resolver":"https://pith.science/pith/VMHV47GBJMBBDC4XVLKEAFNNIG","bundle":"https://pith.science/pith/VMHV47GBJMBBDC4XVLKEAFNNIG/bundle.json","state":"https://pith.science/pith/VMHV47GBJMBBDC4XVLKEAFNNIG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VMHV47GBJMBBDC4XVLKEAFNNIG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:VMHV47GBJMBBDC4XVLKEAFNNIG","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":"0ff291930e83a2732c8cf6a5ded7a824ef52a59cad391b9e6712fc9e4211c71b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2025-05-29T14:30:17Z","title_canon_sha256":"58fe5062e6aac3ef24087bfe992bdf9b537656822181438fcceac465f6f7e987"},"schema_version":"1.0","source":{"id":"2505.23481","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.23481","created_at":"2026-07-05T11:25:11Z"},{"alias_kind":"arxiv_version","alias_value":"2505.23481v2","created_at":"2026-07-05T11:25:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.23481","created_at":"2026-07-05T11:25:11Z"},{"alias_kind":"pith_short_12","alias_value":"VMHV47GBJMBB","created_at":"2026-07-05T11:25:11Z"},{"alias_kind":"pith_short_16","alias_value":"VMHV47GBJMBBDC4X","created_at":"2026-07-05T11:25:11Z"},{"alias_kind":"pith_short_8","alias_value":"VMHV47GB","created_at":"2026-07-05T11:25:11Z"}],"graph_snapshots":[{"event_id":"sha256:8e0b9f980c4ecd281c2e255f778a84066da11fc8a55400d3868aba5cb23f7f48","target":"graph","created_at":"2026-07-05T11:25:11Z","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/2505.23481/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"PhysicsNeRF is a physically grounded framework for 3D reconstruction from sparse views, extending Neural Radiance Fields with four complementary constraints: depth ranking, RegNeRF-style consistency, sparsity priors, and cross-view alignment. While standard NeRFs fail under sparse supervision, PhysicsNeRF employs a compact 0.67M-parameter architecture and achieves 21.4 dB average PSNR using only 8 views, outperforming prior methods. A generalization gap of 5.7-6.2 dB is consistently observed and analyzed, revealing fundamental limitations of sparse-view reconstruction. PhysicsNeRF enables phys","authors_text":"Hasan Kurban, Hussein Alnuweiri, Mohamed Rayan Barhdadi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2025-05-29T14:30:17Z","title":"PhysicsNeRF: Physics-Guided 3D Reconstruction from Sparse Views"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.23481","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:e6ff235d75c7df8bddd78b1b5693ca1980dee154fe0b5f591c8125af25de1626","target":"record","created_at":"2026-07-05T11:25:11Z","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":"0ff291930e83a2732c8cf6a5ded7a824ef52a59cad391b9e6712fc9e4211c71b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2025-05-29T14:30:17Z","title_canon_sha256":"58fe5062e6aac3ef24087bfe992bdf9b537656822181438fcceac465f6f7e987"},"schema_version":"1.0","source":{"id":"2505.23481","kind":"arxiv","version":2}},"canonical_sha256":"ab0f5e7cc14b02118b97aad44015ad418556ae0c88cd6492edc367423e7981c2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ab0f5e7cc14b02118b97aad44015ad418556ae0c88cd6492edc367423e7981c2","first_computed_at":"2026-07-05T11:25:11.432586Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:25:11.432586Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jmXuJuxCX7rH4SdI+vYdxDZiFJHYhwK+4uj7oDhCvTjzK5VLkIXy2Ae+nnEYTRqiRmCIkJNOVOm21lABsUCvCg==","signature_status":"signed_v1","signed_at":"2026-07-05T11:25:11.433073Z","signed_message":"canonical_sha256_bytes"},"source_id":"2505.23481","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e6ff235d75c7df8bddd78b1b5693ca1980dee154fe0b5f591c8125af25de1626","sha256:8e0b9f980c4ecd281c2e255f778a84066da11fc8a55400d3868aba5cb23f7f48"],"state_sha256":"d51553a8c0d255015f8e8a53243912a9aa19f614c09854e87ff6e47d359a2d71"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6Em3hmpnDqKmzjMvW4s1INIHemWy3hWedifG7d7afEQW5CSVw9pRterJKXVWwmDfpGHEAaniVoJO2ACBMH3zAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T01:34:18.906153Z","bundle_sha256":"3c904303250f1ce3b20c2a4179b2bb5a0eecbee9fc7fb1d560543eb43b9e4418"}}