Variational Optimality of Föllmer Processes in Generative Diffusions

• URL: http://arxiv.org/abs/2602.10989v1
• Date: Wed, 11 Feb 2026 16:15:19 GMT
• Title: Variational Optimality of Föllmer Processes in Generative Diffusions
• Authors: Yifan Chen, Eric Vanden-Eijnden,
• Abstract summary: We analyze generative diffusions that transport a point mass to a prescribed target distribution over a finite time horizon.<n>We show that the diffusion coefficient can be tuned emphaposteriori without changing the time-marginal distributions.
• Score: 20.583125441867434
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We construct and analyze generative diffusions that transport a point mass to a prescribed target distribution over a finite time horizon using the stochastic interpolant framework. The drift is expressed as a conditional expectation that can be estimated from independent samples without simulating stochastic processes. We show that the diffusion coefficient can be tuned \emph{a~posteriori} without changing the time-marginal distributions. Among all such tunings, we prove that minimizing the impact of estimation error on the path-space Kullback--Leibler divergence selects, in closed form, a Föllmer process -- a diffusion whose path measure minimizes relative entropy with respect to a reference process determined by the interpolation schedules alone. This yields a new variational characterization of Föllmer processes, complementing classical formulations via Schrödinger bridges and stochastic control. We further establish that, under this optimal diffusion coefficient, the path-space Kullback--Leibler divergence becomes independent of the interpolation schedule, rendering different schedules statistically equivalent in this variational sense.

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