= Hermitian matrix model
{c}
{title2=$Z=\int dM\,e^{-S(M)}$}
A <Hermitian matrix model> replaces a spacetime field by a finite-dimensional <Hermitian matrix>. Its normalized integral supplies correlation functions and a zero-dimensional <perturbative quantum field theory> expansion. For an action built from <traces> of matrix powers, <unitary matrix> conjugation is a symmetry and the <eigenvalues> describe the invariant degrees of freedom. A quartic real integral needs a nonnegative highest-order coupling for convergence; a formal power series can be studied independently of this convergence issue.
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