Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Série LPENS-PH
Domaines hep-th
Date Mardi 26 Mai 2026
Heure 14:00
Institut LPENS
Salle LPENS Library - E239
Nom de l'orateur Migdal
Prenom de l'orateur Alexander
Addresse email de l'orateur
Institution de l'orateur IAS
Titre Geometric QCD II: The Confining Twistor String and Meson Spectrum
Résumé We present the exact analytic solution of the Makeenko-Migdal loop equations, solving planar QCD (Nc→∞) in the continuum limit. Quantizing internal Majorana fermions (elves) on a rigid Hodge-dual minimal surface provides the algebraic mechanism satisfying the unintegrated vector loop equations. The Pauli principle exactly cancels non-planar intersections to reproduce planar factorization, while iterating the equation generates the planar graphs of asymptotically free QCD. Holographically fixing the bulk geometry by the boundary loop strictly avoids Liouville instability. Momentum loop space integrates out coordinate-space cusp singularities, yielding a finite local limit. Gauge-fixing the Virasoro constraint parametrizes the reduced phase-space measure by boundary twistors. The theory reduces to a confining analytic twistor string: a boundary sigma model S1→(S3×S3)/S1 coupled to a holographically determined Liouville field. The meson spectrum becomes a 1D functional integral over boundary twistor trajectories. Complexified action monodromies reveal a discrete mass spectrum governed by Catastrophe Theory, classified by the topological number of twistor poles inside the unit circle. This geometric localization is an infinite- dimensional realization of Exact WKB analysis and Picard-Lefschetz resurgence, where twistor poles act identically to Seiberg-Witten branch points. The 1-pole sector yields the exact Regge spectrum m2=πσ2(n+1/24), matching experimental π,K,ρ trajectories within 95% confidence. The empirically correct open-string intercepts emerge directly from the conformal anomaly of the microscopic elves rather than macroscopic string vibrations. Ultimately, this explicitly realizes Witten's Master Field as a critical classical trajectory in twistor space.
Numéro de preprint arXiv
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