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authorJaron Kent-Dobias <jaron@kent-dobias.com>2024-06-28 11:54:29 +0200
committerJaron Kent-Dobias <jaron@kent-dobias.com>2024-06-28 11:54:29 +0200
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Editing changes to the superspace subspection and a figure caption.
Diffstat (limited to 'marginal.tex')
-rw-r--r--marginal.tex17
1 files changed, 12 insertions, 5 deletions
diff --git a/marginal.tex b/marginal.tex
index 190c3be..3eeed6b 100644
--- a/marginal.tex
+++ b/marginal.tex
@@ -650,9 +650,9 @@ The ordinary Kac--Rice calculation involves many moving parts, and this method
for incorporating marginality adds even more. It is therefore convenient to
introduce compact and simplifying notation through a superspace representation.
The use of superspace in the Kac--Rice calculation is well established, as well
-as the deep connections with BRST symmetry that is implied.
+as the deep connections with BRST symmetry that is implied \cite{Annibale_2003_Supersymmetric, Annibale_2003_The, Annibale_2004_Coexistence}.
Appendix~\ref{sec:superspace} introduces the notation and methods of
-superspace. Here we describe how it can be used to simplify the complexity
+superspace algebra. Here we describe how it can be used to simplify the complexity
calculation for marginal minima.
We consider the $\mathbb R^{N|4}$ superspace whose Grassmann indices are
@@ -687,7 +687,13 @@ Here we have also defined the operator
(1-\hat\beta\bar\theta_1\theta_1)
-\delta^{\alpha1}\hat\lambda-\beta
\end{equation}
-which encodes various aspects of the complexity problem, and the measures
+which encodes various aspects of the complexity problem. When the Lagrangian is
+expanded in a series with respect to the Grassmann indices and the definition
+of $B$ inserted, the result of the Grassmann integrals produces exactly the
+content of the integrand in \eqref{eq:min.complexity.expanded} with the
+substitutions \eqref{eq:delta.grad}, \eqref{eq:delta.energy},
+\eqref{eq:delta.eigen}, and \eqref{eq:determinant} of the Dirac $\delta$
+functions and the determinant made. The new measures
\begin{align}
d\pmb\phi_a^\alpha
&=\left[
@@ -702,7 +708,7 @@ which encodes various aspects of the complexity problem, and the measures
d\pmb\omega&=\bigg(\prod_{i=1}^rd\omega_i\bigg)
\,\delta\bigg(N\mu-\sum_i^r\omega_i\operatorname{Tr}\partial\partial g_i\bigg)
\end{align}
-that collect the individual measures of the various fields embedded in the superfield.
+collect the individual measures of the various fields embedded in the superfield, along with their constraints.
\end{widetext}
With this way of writing the replicated count, the problem of marginal
complexity temporarily takes the schematic form of an equilibrium calculation
@@ -710,6 +716,7 @@ with configurations $\pmb\phi$, inverse temperature $B$, and energy $L$. This
makes the intermediate pieces of the calculation dramatically simpler. Of
course the intricacies of the underlying problem are not banished: near the end
of the calculation, terms involving the superspace must be expanded.
+We will make use of this representation to simplify the analysis of the marginal complexity when analyzing random sums of squares in Section \ref{sec:least.squares}.
\section{Examples}
\label{sec:examples}
@@ -1251,7 +1258,7 @@ subspace and a stable minimum on the other.
\textbf{(b)}~Spectra corresponding to the parameters $\omega_1$ and
$\omega_2$ marked by the circles in panel (a).
\textbf{(c)}~The complexity of marginal minima in a multispherical model with
- $f_i(q)=q^{p_i}/[p_i(p_i-1)]$ for $p_1=3$ and $p_2=4$ for a variety of
+ $f_1(q)=\frac16q^3$ and $f_2(q)=\frac1{12}q^4$ for a variety of
$\epsilon$. Since $f_1''(1)=f_2''(1)=1$, the marginal values correspond
precisely to those in (a--b).
} \label{fig:msg.marg}