We present an alternative approach to the theory of free Gibbs states with convex
potentials. Instead of solving SDEs, we combine PDE techniques with a notion of
asymptotic approximability by trace polynomials for a sequence of functions on
to prove the
following. Suppose
is a
probability measure on
given by uniformly convex and semiconcave potentials
, and suppose
that the sequence
is asymptotically approximable by trace polynomials. Then the moments of
converge to a
noncommutative law
.
Moreover, the free entropies
,
, and
agree and equal the limit of the normalized classical entropies of
.
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