{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:FFLKGNJCVEXDA42D5DFSMSY4TW","short_pith_number":"pith:FFLKGNJC","schema_version":"1.0","canonical_sha256":"2956a33522a92e307343e8cb264b1c9d90a796523ef392b2ec44d5a8277315f4","source":{"kind":"arxiv","id":"1510.00242","version":1},"attestation_state":"computed","paper":{"title":"Compound lensing: Einstein Zig-Zags and high multiplicity lensed images","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"David J. Bacon (ICG, Portsmouth), Thomas E. Collett","submitted_at":"2015-10-01T14:04:49Z","abstract_excerpt":"Compound strong gravitational lensing is a rare phenomenon, but a handful of such lensed systems are likely to be discovered in forthcoming surveys. In this work, we use a double SIS lens model to analytically understand how the properties of the system impact image multiplicity for the final source. We find that up to six images of a background source can form, but only if the second lens is multiply imaged by the first and the Einstein radius of the second lens is comparable to, but does not exceed that of the first. We then build a model of compound lensing masses in the Universe, using SIE"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1510.00242","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-10-01T14:04:49Z","cross_cats_sorted":[],"title_canon_sha256":"3c251e756984196187306d7695962d053c9941930dd56fdacf8d347c50257b80","abstract_canon_sha256":"d612806691edfb959b33ab3e3a7faaf7b5e74d4aca666352f179eb8a64cdf3c4"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:21:52.465957Z","signature_b64":"kPVWPxhbRgW2bu4sSfvmuUROwbYq6jUlGPVSq9nws9D0sUWUubZ/Veq4M66iesqxbXyM/ubP21roOSksxs9ZDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2956a33522a92e307343e8cb264b1c9d90a796523ef392b2ec44d5a8277315f4","last_reissued_at":"2026-05-18T01:21:52.465335Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:21:52.465335Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Compound lensing: Einstein Zig-Zags and high multiplicity lensed images","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"David J. Bacon (ICG, Portsmouth), Thomas E. Collett","submitted_at":"2015-10-01T14:04:49Z","abstract_excerpt":"Compound strong gravitational lensing is a rare phenomenon, but a handful of such lensed systems are likely to be discovered in forthcoming surveys. In this work, we use a double SIS lens model to analytically understand how the properties of the system impact image multiplicity for the final source. We find that up to six images of a background source can form, but only if the second lens is multiply imaged by the first and the Einstein radius of the second lens is comparable to, but does not exceed that of the first. We then build a model of compound lensing masses in the Universe, using SIE"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.00242","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1510.00242","created_at":"2026-05-18T01:21:52.465418+00:00"},{"alias_kind":"arxiv_version","alias_value":"1510.00242v1","created_at":"2026-05-18T01:21:52.465418+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.00242","created_at":"2026-05-18T01:21:52.465418+00:00"},{"alias_kind":"pith_short_12","alias_value":"FFLKGNJCVEXD","created_at":"2026-05-18T12:29:19.899920+00:00"},{"alias_kind":"pith_short_16","alias_value":"FFLKGNJCVEXDA42D","created_at":"2026-05-18T12:29:19.899920+00:00"},{"alias_kind":"pith_short_8","alias_value":"FFLKGNJC","created_at":"2026-05-18T12:29:19.899920+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/FFLKGNJCVEXDA42D5DFSMSY4TW","json":"https://pith.science/pith/FFLKGNJCVEXDA42D5DFSMSY4TW.json","graph_json":"https://pith.science/api/pith-number/FFLKGNJCVEXDA42D5DFSMSY4TW/graph.json","events_json":"https://pith.science/api/pith-number/FFLKGNJCVEXDA42D5DFSMSY4TW/events.json","paper":"https://pith.science/paper/FFLKGNJC"},"agent_actions":{"view_html":"https://pith.science/pith/FFLKGNJCVEXDA42D5DFSMSY4TW","download_json":"https://pith.science/pith/FFLKGNJCVEXDA42D5DFSMSY4TW.json","view_paper":"https://pith.science/paper/FFLKGNJC","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1510.00242&json=true","fetch_graph":"https://pith.science/api/pith-number/FFLKGNJCVEXDA42D5DFSMSY4TW/graph.json","fetch_events":"https://pith.science/api/pith-number/FFLKGNJCVEXDA42D5DFSMSY4TW/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/FFLKGNJCVEXDA42D5DFSMSY4TW/action/timestamp_anchor","attest_storage":"https://pith.science/pith/FFLKGNJCVEXDA42D5DFSMSY4TW/action/storage_attestation","attest_author":"https://pith.science/pith/FFLKGNJCVEXDA42D5DFSMSY4TW/action/author_attestation","sign_citation":"https://pith.science/pith/FFLKGNJCVEXDA42D5DFSMSY4TW/action/citation_signature","submit_replication":"https://pith.science/pith/FFLKGNJCVEXDA42D5DFSMSY4TW/action/replication_record"}},"created_at":"2026-05-18T01:21:52.465418+00:00","updated_at":"2026-05-18T01:21:52.465418+00:00"}