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The three remaining supermanifolds support spacetimes of different topology, which are: R x S^3, AdS_3 x R, and a supersymmetric plane wave isometric to the Nappi-Witten group. As is well known, the Minkowski and anti-de Sitter superspaces are solutions of the Poincar\\'e and anti-de Sitter supergravity theories, respectively. Here we demonstrate that the other three superspaces are solutions of no-"},"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":"1606.00654","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2016-06-02T12:56:33Z","cross_cats_sorted":["math-ph","math.MP"],"title_canon_sha256":"caa8bd5476ad5b8b1f6f4c194a9d588688b8b350eaa299f90e5fdebee54c2e35","abstract_canon_sha256":"eb0399fc69b689647f165b2d155a0caec14451a2bee4261c170c163139f0f6da"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:04:12.611887Z","signature_b64":"M+LkVZDIute9GOg4OP08lH6NOz2dhKvEKiFT8vGOclGASoWOLb4VET7MUiS1qobtt9FDjXX+zPLYcvFoGpYsDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"75c7ecb494ce6dcf6cf2e69208d6ee9d0f0a3a10de58be1baedeb9087e9ca165","last_reissued_at":"2026-05-18T01:04:12.611443Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:04:12.611443Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Maximally supersymmetric solutions of $R^2$ supergravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math-ph","math.MP"],"primary_cat":"hep-th","authors_text":"Sergei M. 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