Local Rank-One Logarithmic Instability for the Mixed Hessian of the Dispersionless Toda -Function
This paper establishes a local rank-one logarithmic instability in the mixed Hessian of the dispersionless Toda -function for polynomial conformal maps, demonstrating that along a subcritical path approaching a critical point, exactly one variational eigenvalue diverges logarithmically while all others remain bounded, thereby isolating the mechanism responsible for the first spectral transition preceding geometric breakdown in Laplacian growth.