{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"2ebf99ec6f22bbf016a6909c370f453d43f15ea4c3b82e2504e3edd283d5da29","created":"2026-10-03T07:18:08Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"d39b36972c7853a94717a05680d237fe37a20f91aa48093a61902fcc6b4f9b69","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"plasma.sfqed-breakdown.finite-pulse-relevance","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"The predicted breakdown was derived for an idealized field that never switches off, while real laser pulses last a finite time. Calculations for finite pulses find much milder growth of the corrections, so it is unclear whether any real field shows the breakdown.","posed_since":"2019","precise":"The $(\\alpha \\chi^{2/3})^n$ loop scaling (Ritus-Narozhny conjecture) holds in an infinite constant crossed field; for finite plane-wave pulses at fixed intensity parameter a0 = e E/(m c omega) and growing particle energy, loop corrections to observables grow only logarithmically (Podszus and Di Piazza 2019; Ilderton 2019), with the constant-field behavior recovered only under a condition of the form $\\chi$ << a0^3 (approximate). Determine the region in the space of a0, chi and pulse phase duration in which n-loop corrections to physical observables (photon emission probability, pair yield, electron mass shift) scale as $(\\alpha \\chi^{2/3})^n$, and decide whether that region overlaps $\\alpha \\chi^{2/3} >\\sim 1$ for any physically realizable background, including non-plane-wave fields such as colliding beams.","problem_ref":null,"references":"","settled_by":"Explicit higher-loop calculations of observables in finite pulses and in beam-beam field configurations, mapping where the power-law scaling holds.","status_note":"Edwards and Ilderton (Phys. Rev. D, 2021) found, for inclusive observables with background-collinear degeneracies resummed to all orders in $\\alpha$, an exponential rather than the conjectured power-law intensity dependence, while Di Piazza and Lopez-Lopez (2020) found vertex-correction asymptotics consistent with the conjecture.","title":"Does the Ritus-Narozhny scaling survive in realistic finite-duration 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