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On the supergravity side the (extremal) instanton solutions are neatly described by the (lightlike) geodesics on the AdS moduli space for which we find the explicit expression and compute the on-shell actions in terms of the quantised charges. The lightlike geodesics fall into two categories depending on the degree of nilpotency of the Noether charge matrix carried by the geodesic: For degree 2 the instantons pre"},"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":"1712.06081","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2017-12-17T09:54:01Z","cross_cats_sorted":[],"title_canon_sha256":"61aeeeb8b3afa980270f8357ce9f87167e3967366a6bf95d2c8046fa9e9937a9","abstract_canon_sha256":"b9bb4676360dd228244fda370da46724b0346e06b0782744d92b7c6f64418972"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:18:14.493444Z","signature_b64":"bgaDCELnsCifmrEUmajRw8nAcnU6dF3n8FnKVJ+WOfWFKWV/oJoTB3wl4eglVkPtTBiVsUPoQBdeRyjZGfjuBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2c0ced9a38f14ab5768f72aeb349acae9b70511224c944e6e25685aca8eea97e","last_reissued_at":"2026-05-18T00:18:14.492954Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:18:14.492954Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Instantons from geodesics in AdS moduli spaces","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-th","authors_text":"Daniele Ruggeri, Mario Trigiante, Thomas Van Riet","submitted_at":"2017-12-17T09:54:01Z","abstract_excerpt":"We investigate supergravity instantons in Euclidean $\\rm AdS_5\\times S^5/\\mathbb{Z}_k$. 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