{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:PLDYOSOEPGQLV6KW32WY4CMP2N","short_pith_number":"pith:PLDYOSOE","canonical_record":{"source":{"id":"2308.03392","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2023-08-07T08:20:40Z","cross_cats_sorted":[],"title_canon_sha256":"4efd2740feb65c4ac527c4cb9686ef8f61aa41139e0850cf6a79afe2c0068d11","abstract_canon_sha256":"592a04de3525b374078cd83e1ef81e7e5457191903c4eaea308cc4585288b306"},"schema_version":"1.0"},"canonical_sha256":"7ac78749c479a0baf956dead8e098fd35947fe8f6abea307f541bb7b34fda5f2","source":{"kind":"arxiv","id":"2308.03392","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2308.03392","created_at":"2026-07-05T09:25:31Z"},{"alias_kind":"arxiv_version","alias_value":"2308.03392v2","created_at":"2026-07-05T09:25:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2308.03392","created_at":"2026-07-05T09:25:31Z"},{"alias_kind":"pith_short_12","alias_value":"PLDYOSOEPGQL","created_at":"2026-07-05T09:25:31Z"},{"alias_kind":"pith_short_16","alias_value":"PLDYOSOEPGQLV6KW","created_at":"2026-07-05T09:25:31Z"},{"alias_kind":"pith_short_8","alias_value":"PLDYOSOE","created_at":"2026-07-05T09:25:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:PLDYOSOEPGQLV6KW32WY4CMP2N","target":"record","payload":{"canonical_record":{"source":{"id":"2308.03392","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2023-08-07T08:20:40Z","cross_cats_sorted":[],"title_canon_sha256":"4efd2740feb65c4ac527c4cb9686ef8f61aa41139e0850cf6a79afe2c0068d11","abstract_canon_sha256":"592a04de3525b374078cd83e1ef81e7e5457191903c4eaea308cc4585288b306"},"schema_version":"1.0"},"canonical_sha256":"7ac78749c479a0baf956dead8e098fd35947fe8f6abea307f541bb7b34fda5f2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:25:31.851840Z","signature_b64":"x65MYCC6uBgTvYYeSjjInfgoXfi7kJlIhM2rEJyhs6ppyvvcjLPtpMMxHmALwihoOXP/CUvveEziVUQc7HtHDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7ac78749c479a0baf956dead8e098fd35947fe8f6abea307f541bb7b34fda5f2","last_reissued_at":"2026-07-05T09:25:31.851377Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:25:31.851377Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2308.03392","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":"2026-07-05T09:25:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rwbA2aEyiY59yhaQjr4BrR0TGm2EWtLPHzEQE4187DW4Q5GiOuS+4PFDqvjZcTq+RI+hazD2ed5BzX/y9GBIBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T19:11:11.078658Z"},"content_sha256":"0ded289eca91f0a64409cd0d3c00c72423ee5595fddc9bedc58a348c09686bd8","schema_version":"1.0","event_id":"sha256:0ded289eca91f0a64409cd0d3c00c72423ee5595fddc9bedc58a348c09686bd8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:PLDYOSOEPGQLV6KW32WY4CMP2N","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Estimation of Complex Valued Laplacian Matrices for Topology Identification in Power Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"H. Vincent Poor, Morad Halihal, Tirza Routtenberg","submitted_at":"2023-08-07T08:20:40Z","abstract_excerpt":"In this paper, we investigate the problem of estimating a complex-valued Laplacian matrix with a focus on its application in the estimation of admittance matrices in power systems. The proposed approach is based on a constrained maximum likelihood estimator (CMLE) of the complex-valued Laplacian, which is formulated as an optimization problem with Laplacian and sparsity constraints. The complex-valued Laplacian is a symmetric, non-Hermitian matrix that exhibits a joint sparsity pattern between its real and imaginary parts. Thus, we present a group-sparse-based penalized log-likelihood approach"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2308.03392","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/2308.03392/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":"2026-07-05T09:25:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qd1Kd8J9pX6aSZVyTjRsjr8sTO3Fwi+NgevKuIDyzsHbte2dHCeqZyVMgVQzAugIg5S54pVMDOckbv26QvgrAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T19:11:11.079251Z"},"content_sha256":"37c2b626ea8290cfedda12f5a035d56f57866ed3229250bcb0b10389630dc1e9","schema_version":"1.0","event_id":"sha256:37c2b626ea8290cfedda12f5a035d56f57866ed3229250bcb0b10389630dc1e9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PLDYOSOEPGQLV6KW32WY4CMP2N/bundle.json","state_url":"https://pith.science/pith/PLDYOSOEPGQLV6KW32WY4CMP2N/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PLDYOSOEPGQLV6KW32WY4CMP2N/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":"2026-08-01T19:11:11Z","links":{"resolver":"https://pith.science/pith/PLDYOSOEPGQLV6KW32WY4CMP2N","bundle":"https://pith.science/pith/PLDYOSOEPGQLV6KW32WY4CMP2N/bundle.json","state":"https://pith.science/pith/PLDYOSOEPGQLV6KW32WY4CMP2N/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PLDYOSOEPGQLV6KW32WY4CMP2N/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:PLDYOSOEPGQLV6KW32WY4CMP2N","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":"592a04de3525b374078cd83e1ef81e7e5457191903c4eaea308cc4585288b306","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2023-08-07T08:20:40Z","title_canon_sha256":"4efd2740feb65c4ac527c4cb9686ef8f61aa41139e0850cf6a79afe2c0068d11"},"schema_version":"1.0","source":{"id":"2308.03392","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2308.03392","created_at":"2026-07-05T09:25:31Z"},{"alias_kind":"arxiv_version","alias_value":"2308.03392v2","created_at":"2026-07-05T09:25:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2308.03392","created_at":"2026-07-05T09:25:31Z"},{"alias_kind":"pith_short_12","alias_value":"PLDYOSOEPGQL","created_at":"2026-07-05T09:25:31Z"},{"alias_kind":"pith_short_16","alias_value":"PLDYOSOEPGQLV6KW","created_at":"2026-07-05T09:25:31Z"},{"alias_kind":"pith_short_8","alias_value":"PLDYOSOE","created_at":"2026-07-05T09:25:31Z"}],"graph_snapshots":[{"event_id":"sha256:37c2b626ea8290cfedda12f5a035d56f57866ed3229250bcb0b10389630dc1e9","target":"graph","created_at":"2026-07-05T09:25:31Z","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/2308.03392/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this paper, we investigate the problem of estimating a complex-valued Laplacian matrix with a focus on its application in the estimation of admittance matrices in power systems. The proposed approach is based on a constrained maximum likelihood estimator (CMLE) of the complex-valued Laplacian, which is formulated as an optimization problem with Laplacian and sparsity constraints. The complex-valued Laplacian is a symmetric, non-Hermitian matrix that exhibits a joint sparsity pattern between its real and imaginary parts. Thus, we present a group-sparse-based penalized log-likelihood approach","authors_text":"H. Vincent Poor, Morad Halihal, Tirza Routtenberg","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2023-08-07T08:20:40Z","title":"Estimation of Complex Valued Laplacian Matrices for Topology Identification in Power Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2308.03392","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":"sha256:0ded289eca91f0a64409cd0d3c00c72423ee5595fddc9bedc58a348c09686bd8","target":"record","created_at":"2026-07-05T09:25:31Z","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":"592a04de3525b374078cd83e1ef81e7e5457191903c4eaea308cc4585288b306","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2023-08-07T08:20:40Z","title_canon_sha256":"4efd2740feb65c4ac527c4cb9686ef8f61aa41139e0850cf6a79afe2c0068d11"},"schema_version":"1.0","source":{"id":"2308.03392","kind":"arxiv","version":2}},"canonical_sha256":"7ac78749c479a0baf956dead8e098fd35947fe8f6abea307f541bb7b34fda5f2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7ac78749c479a0baf956dead8e098fd35947fe8f6abea307f541bb7b34fda5f2","first_computed_at":"2026-07-05T09:25:31.851377Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:25:31.851377Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"x65MYCC6uBgTvYYeSjjInfgoXfi7kJlIhM2rEJyhs6ppyvvcjLPtpMMxHmALwihoOXP/CUvveEziVUQc7HtHDw==","signature_status":"signed_v1","signed_at":"2026-07-05T09:25:31.851840Z","signed_message":"canonical_sha256_bytes"},"source_id":"2308.03392","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0ded289eca91f0a64409cd0d3c00c72423ee5595fddc9bedc58a348c09686bd8","sha256:37c2b626ea8290cfedda12f5a035d56f57866ed3229250bcb0b10389630dc1e9"],"state_sha256":"9a13a32a28aaf0c770c3b164720f9d3fd309bafb5436abba7ac8c9fbcda2eca3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gWJ4vWzE4qHCiCKfZ5ynYf0sLmCapghOh85iK6Cy2nKYPJgdPymqa/u6ic83otrwwJ76U57STDepogjh93w6DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-01T19:11:11.084641Z","bundle_sha256":"eb91d2fe732ec24f271ed000dfbd66f4bf23339f12f55e020cc09d4f6be366d0"}}