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We measure the 2D galaxy velocity distribution in the cluster infall region by applying the galaxy infall kinematics (GIK) model developed by Zu and Weinberg (2013) to two suites of f(R) and Galileon modified gravity simulations. Despite having distinct screening mechanisms, namely, the Chameleon and the Vainshtein effects, the f(R) and Galileon clusters exhibit very similar deviations in their GIK profiles from GR, with ~ 100-20"},"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":"1310.6768","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-10-24T20:32:52Z","cross_cats_sorted":[],"title_canon_sha256":"792cbebb34266552d9e8cb1a0f8c249299da5e74b07c992c879d20312dde03cb","abstract_canon_sha256":"e75e210da5f028b4f2fc58034e8995741d184fca12b776397649f928839fb8c4"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:46:49.831414Z","signature_b64":"24DKuAaMe2ovP6E39Q4/TsNpXgCmfNckp91X/BAydEM+PuyyDdk57GbA2b35UshVHK1WRuWRH6D2tH0mIuqgBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6373e46284ed73c6f3dceb3aa80315f25bb3c63868bf31c4dc30817bedfc643b","last_reissued_at":"2026-05-18T01:46:49.830676Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:46:49.830676Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Galaxy Infall Kinematics as a Test of Modified Gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Baojiu Li (Durham), D. 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