Can tiny structures in the universe reshape how dark energy evolves?

Brax shows that when scalar fields couple to matter across vastly different scales, integrating out short-distance physics leaves behind stochastic noise that modifies how these fields evolve cosmically. These corrections can mimic dynamical dark energy, or—when all substructures are screened—suppress large-scale dynamics entirely, like a cosmic Meissner effect. Small-scale structure matters far more for dark energy than previously assumed.