{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"606167c5f166eb73a6d78a7cf521a9efa7900449513618ff4c3c954590011b53","created":"2026-10-03T07:18:04Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"8c7ff89b2464eca94090e194b01ef6b335822283455edda8591bf3f075f2e973","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"grav.qft-curved-backreaction.desitter-ir-stability","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"In an expanding universe with a cosmological constant, quantum fluctuations of light fields and gravitons can accumulate over time. Some argue that this slowly screens or destabilizes the expansion; others argue the effect is an artifact of the calculation.","posed_since":"","precise":"For massless minimally coupled scalars and perturbative gravitons on de Sitter space with Hubble rate H, loop corrections to correlators and to $\\langle T_{ab}\\rangle$ grow secularly as powers of H t or $\\ln a$, with a the scale factor (Tsamis and Woodard; Polyakov 2012). Determine whether, after infrared resummation and in terms of gauge-invariant observables, back-reaction changes the local expansion rate or produces an instability, or whether the secular terms are gauge or resummation artifacts. An answer is a gauge-invariant computation of a local expansion observable with controlled infrared resummation and its late-time limit.","problem_ref":null,"references":"","settled_by":"A gauge-invariant, infrared-resummed calculation of the late-time local expansion rate including graviton loops.","status_note":"Stochastic resummation controls scalar secular growth; the graviton case and Polyakov's instability claim remain disputed as of 2026.","title":"Is de Sitter space stable against infrared quantum 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