{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"0d7b4de519d5c3171350d0beb2c34a818873a28e2a7de983f290ffe8c093cd8f","created":"2026-10-03T07:17:52Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"8bf46b2c50fbc58f45e32b152e65c381c2dbe3767cd7ca72a2d24beb2c5c1812","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"qft.massless-bootstrap","field":"qft","n":"1","review_cite":"M. Kruczenski, J. Penedones, B. C. van Rees, Snowmass White Paper: S-matrix Bootstrap, arXiv:2203.02421, 2022","review_link":"https://arxiv.org/abs/2203.02421","review_verified":"true","summary":"The S-matrix bootstrap finds which scattering outcomes are allowed using only basic principles such as conservation of probability and causality. In four dimensions, massless particles like photons, gravitons and zero-mass pions make the method hard to set up.","title":"S-matrix bootstrap with massless particles in four dimensions","topic_ref":null,"why":"Massless particles dominate low-energy physics, so bounds on their scattering constrain the Standard Model's low-energy theory and quantum gravity without knowing the underlying theory."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"ec37b6151c82884c89bcd0edd8abd842fda27798c1918aa964b247ee16f12213","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"39125cc6877a89a6ebd189ebfdf47aff0f08fa27a1f0753eb2066c904978be1d","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"ZB59G4WjwtT_fvpLP5B40hQODQSA642t7qIo5S1s3GlZIUM2qoU8vGIx6T_h4NIyN0D0uuObyN056yzIFzMIAQ"},"schema":"pubphys.envelope/1"},"record_hash":"ec37b6151c82884c89bcd0edd8abd842fda27798c1918aa964b247ee16f12213","leaf_index":318}