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---
## Why closure still needs a stabilization mechanism
ASD gives an analytic mechanism by which higher-order orientation energy resists radial collapse. For a fixed-shape three-dimensional scale family, quadratic gradients, positive fourth-order gradients and a nonnegative volume potential produce a unique positive stationary point. Chapter 4 gives a dimensionless scale; Chapter 5 gives a dimensional core radius. The calculations below connect this established scale result to the remaining field-solution and perturbation questions.
A structure can retain a nonzero topological quantity while shrinking, expanding, splitting or radiating. Stability asks why allowed changes do not destroy persistent matter organization. Chapter 4 first tests a direct change: keep shape and topology fixed while changing the overall scale. This necessary test reveals the required energy ingredients before solving complete fields and perturbation spectra.
For a static candidate, perturbations must respect the target, constraints and distant boundary. The field equations require zero first variation; a local energy minimum also needs a constrained second variation without negative directions. Symmetry changes such as translation and rotation may be zero modes rather than instabilities. Periodic refresh structures require examination of evolution over each period and radiation.
## Quadratic gradients alone do not fix a three-dimensional size
Let $Q_\lambda(\mathbf x)=Q(\mathbf x/\lambda)$, so $\lambda>1$ expands the structure. Here $\lambda$ is a dimensionless scale parameter, not a wavelength. $E_2$ and $E_V$ are the quadratic spatial gradient energy and nonnegative vacuum-subtracted potential of the same reference configuration, both in energy units. With $\mathbf y=\mathbf x/\lambda$, volume contributes $\lambda^3$ and each spatial derivative $\lambda^{-1}$:
Quadratic gradients therefore contribute $\lambda^{3-2}=\lambda$, and the local potential $\lambda^3$. For a nontrivial static three-dimensional configuration with $E_2>0$ and $E_V\ge0$, the derivative at $\lambda=1$ is positive. Shrinking lowers energy and no finite-scale stationary point exists.
This is the [Derrick-type condition](https://doi.org/10.1063/1.1704233) used here. It identifies a missing resistance to collapse in this particular static energy. Time dependence, conserved-charge constraints, extra fields and discrete boundaries can change its assumptions; their complete dynamics must be examined rather than extending the result to every localized structure.
## How higher gradients resist collapse
For candidate orientation $Q\in SU(2)$, Chapter 4 defines $L_i=Q^{-1}\partial_iQ$ and introduces
$L_i$ has inverse-length units. The norm $\|X\|^2=\operatorname{Tr}(X^\dagger X)/2$ is nonnegative; the trace of the square of an anti-Hermitian matrix should not be mistaken for positive energy. $A_2>0$ has energy-per-length units and $A_4>0$ energy-times-length units. $W(Q,\chi)$ is a vacuum-subtracted potential density whose lower bound must be checked jointly with coupling.
The squared commutator contains four spatial derivatives and scales as $\lambda^{3-4}=\lambda^{-1}$. It grows on shrinking and competes with quadratic gradients:
$$
E(\lambda)=\lambda E_2+\lambda^{-1}E_4+\lambda^3E_V,
\qquad E'(\lambda)=E_2-\frac{E_4}{\lambda^2}+3E_V\lambda^2.
$$
Stationarity at $\lambda=1$ requires $E_2-E_4+3E_V=0$, showing the fourth-order contribution’s resistance to collapse. The manuscript explicitly adopts this [Skyrme-type mechanism](https://doi.org/10.1098/rspa.1961.0018) as a continuum candidate; deriving its coefficients from microscopic response remains a separate calculation.
For $E_2,E_4>0$ and $E_V\ge0$, multiplying the stationary equation by $\lambda^2$ gives a quadratic in $\lambda^2$. Chapter 4 supplies its unique positive root and curvature:
The rationalized root includes $E_V=0$ directly. This is the scale solution for a general nonnegative volume potential, rather than only the zero-potential case; it tests the fixed-shape scale family.
## Chapter 5 uses the inverse scale parameter
Chapter 5 writes $\Theta_{\lambda_5}(\mathbf r)=\Theta(\lambda_5\mathbf r)$. Thus $\lambda_5=1/\lambda$ and increasing $\lambda_5$ shrinks the structure:
$$
E(\lambda_5)=\lambda_5^{-1}E_2+\lambda_5E_4+\lambda_5^{-3}E_0,
\qquad E_4=E_2+3E_0.
$$
Here $E_0$ is the potential contribution in this scale formula, corresponding to $E_V$, rather than the complete rest energy in the mass article. Both chapters give the same stationary condition; opposite powers arise from the parameter substitution. Their norm and summation conventions also differ: Chapter 4 uses a half-trace norm and $i0$. The $A_2,A_4,A_0$ in (5.6.24) are fixed-shape integral coefficients, with units $\mathrm{J/m}$, $\mathrm{J\,m}$ and $\mathrm{J/m^3}$. Their correspondence with the identically named coefficients in the energy density requires those shape integrals; identical letters alone do not equate the parameters.
Differentiating $E(R)=A_2R+A_4/R+A_0R^3$ and setting $x=R^2$ gives $E'(R)=A_2-A_4/R^2+3A_0R^2$ and $3A_0x^2+A_2x-A_4=0$. For $A_2,A_4>0$, first solve with $A_0>0$ and then rationalize the numerator to obtain (5.6.25):
The difference expression applies to $A_0>0$. The rationalized expression directly gives $R_*^2=A_4/A_2$ at $A_0=0$ without division by zero. Both roots have length-squared units, and $E''(R_*)$ has energy-per-length-squared units. The unique positive stationary point and positive curvature establish the finite-radius radial mechanism in the given scale model. Full electron/proton configurations, nonradial perturbations and radiation of periodic states remain questions of the complete equations.
## Inspect the competition with an interactive curve
The interaction fixes $E_2>0$ and uses dimensionless energy ratios for one hypothetical reference configuration, without fitting particle mass or radius. Removing $E_4$ shows energy decreasing with shrinkage; restoring it can produce a minimum. This is a scale-algebra illustration, not a three-dimensional numerical solution, an energy-density profile or experimental data.
## From a scale minimum to full stability
The next calculation solves the actual configuration in the same action and tests radial, nonradial, amplitude and coupled perturbations. If amplitude can cross zero, unwinding paths need evaluation. Splitting and radiation require comparison of final states and evolution. Floquet analysis of a periodic state examines perturbation growth per cycle rather than static scale curvature.
A Peierls–Nabarro barrier in a discrete implementation describes the energy change of an existing structure relative to sites. It can affect motion but is not a sufficient existence condition. Solutions, energy, topology, a full stability domain and moving families jointly determine persistent matter. [OP-MAT-001](/en/open-problems/matter/electron-solution) and [topological classification](/en/open-problems/matter/topological-classification) retain these tasks.