{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"3b532fa99a514e55f762178ffc051da7235b6b6b70e1177522cc5239ef7e353d","created":"2026-10-03T07:17:49Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"30756c5b69fe241ab6eac6bd66a682262f11800e42c6629a636241a627c05097","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"amo.bound-state-qed","field":"amo","n":"1","review_cite":"H. Gao, M. Vanderhaeghen, The proton charge radius, Reviews of Modern Physics, 2022","review_link":"https://doi.org/10.1103/RevModPhys.94.015002","review_verified":"true","summary":"Simple atoms can be both measured and calculated to more than ten digits, so any mismatch reveals either a mistake or new physics. Results on the proton size, the Rydberg constant (the basic energy unit of atomic levels), and helium and positronium energy levels test this.","title":"Hydrogen, helium and positronium spectroscopy versus QED","topic_ref":null,"why":"These comparisons fix the Rydberg constant and nuclear radii and test quantum electrodynamics of bound states at the highest precision available."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"49408e9491357ca694b4e9c3017e230cf2b78342f17900bd6e9221b8961376f4","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"ca311d495c6d43c4289b298480506b25ca36e8d803a98de40376badadea696bd","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"uTMfp61z7edXpVHv1MO6NXFomzeLROAbBxrbKlc5Gh8w6dEwKVzXNCqT1N6oYl9OlmkRBWYkJ_MMB2sTBvQeDw"},"schema":"pubphys.envelope/1"},"record_hash":"49408e9491357ca694b4e9c3017e230cf2b78342f17900bd6e9221b8961376f4","leaf_index":4}