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It is shown that every conformal Killing vector for the null fluid type $N$ pp-wave spacetimes is a conformal Ricci collineation. The maximum number of proper non-special conformal Killing vectors in a type $N$ pp-wave spacetime is shown to be three, and we determine the form of a particular set of type $N$ pp-wave spacetimes admitting such conformal Killing vectors. We determine the conformal symmetries of e"},"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":"1308.1683","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-08-07T20:01:10Z","cross_cats_sorted":["hep-th","math-ph","math.MP"],"title_canon_sha256":"82c88b9b10563597039680e423a6fcfd78258694e3196ad435e3868c65ee13e5","abstract_canon_sha256":"79d1776fd2ce1ec51aeb98d005982db2546830dd46cbde9d05a2f7e4304ede4c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:16:28.053753Z","signature_b64":"eMg/2Ek23aQIdfwDbx2MyqpIgfOK0FJZKn6xhu+ShA2WxxXeU/pBDEdakMrbwo1gkzn7hheseimhOjC9GBVYCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"751d8c0d214f7c5b8f6b64730fc70242fb3400c94fbaaf0bad1c25fe7e3107c6","last_reissued_at":"2026-05-18T03:16:28.053246Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:16:28.053246Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Conformal symmetry classes for pp-wave spacetimes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th","math-ph","math.MP"],"primary_cat":"gr-qc","authors_text":"Aidan J Keane, Brian O J Tupper","submitted_at":"2013-08-07T20:01:10Z","abstract_excerpt":"We determine conformal symmetry classes for the pp-wave spacetimes. 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