{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"2820306d7f5af7bde72e118aff62a7d4b220c5910545e559ad70f8757e645b2e","created":"2026-10-03T07:17:51Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"cebc61562aae80d5c2c22848c8e2ef335ba514599ef1a208ecb8585311d27dfb","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"grav.qft-curved-backreaction","field":"grav","n":"1","review_cite":"C. J. Fewster, Lectures on quantum energy inequalities, arXiv:1208.5399, 2012","review_link":"https://arxiv.org/abs/1208.5399","review_verified":"true","summary":"Quantum fields such as light can carry pockets of negative energy and act back on the curvature of spacetime. Whether this back-reaction forbids time machines, preserves the singularity theorems, or destabilizes an expanding universe is not settled.","title":"Quantum fields in curved spacetime and back-reaction","topic_ref":null,"why":"These effects decide which classical spacetimes survive once matter is treated quantum mechanically."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"54e15e541115e3360aaf06f45cf07e995bec6e85f78b0b1590eceb46ec062cbe","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"aaa1ad4386a9b62e32a183b6028b26d394988676f31000786dde306a824b3bed","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"BhDZKxUPI9iaf7vjKNmnoQkl7g8VWgk7cMKIu9SIWQ4lMnGJkKIjW7Baued4iCtVr8Z0PruEFxhohCg3oXwXCQ"},"schema":"pubphys.envelope/1"},"record_hash":"54e15e541115e3360aaf06f45cf07e995bec6e85f78b0b1590eceb46ec062cbe","leaf_index":233}