Spatiotemporally correlated activity regulation of random-organizing hyperuniform states

Abstract

Center-of-mass (COM) conservation has been widely accepted as an important mechanism for generating nonequilibrium dynamic hyperuniform states with vanishing long-wavelength density fluctuations, but whether it is sufficient for hyperuniformity remains unclear. Here, using particle simulations and a linear fluctuating theory, we show that spatiotemporally correlated activity regulation can destroy hyperuniformity while preserving COM conservation. We construct a binary mixture in which the local density of independently evolving driver particles regulates the activity of regulated particles following COM-conserving biased random organization. This counterexample demonstrates that hyperuniformity depends on the spatial and temporal correlations of activity as well as the conservation laws governing particle displacements. Our findings clarify the limits of COM conservation as a route to hyperuniformity and highlight the importance of controlling activity correlations in the design of nonequilibrium multihyperuniform mixtures.