{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"fecb491fbad413520b22b87d03a5655656038f72ef2a2cee83299ad3f7d76b43","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["4d550094bce9403ea3a1375e26c95b11f6601bd07e6551d839d4f2022a68d426","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"0e30b668c116a7d0e5df810d6654cc1575e1aa38723f37e77a8e32e14d9f9d1c","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":["ai:gpt-5.5"],"external_id":"plasma.sfqed-breakdown.finite-pulse-relevance","kind":"well-posed","literature_status":"contested","n":"2","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":"4d550094bce9403ea3a1375e26c95b11f6601bd07e6551d839d4f2022a68d426","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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