Castedo Sebastian H, Holmes Joshua, Baron Joseph W, Galla Tobias
University of Manchester, Department of Physics and Astronomy, School of Natural Sciences, The , Manchester M13 9PL, United Kingdom.
Université de Paris, Sorbonne Université, CNRS, l'Ecole Normale Supérieure, Laboratoire de Physique de , ENS, Université PSL, F-75005 Paris, France.
Phys Rev E. 2025 Apr;111(4-1):044202. doi: 10.1103/PhysRevE.111.044202.
In the study of disordered systems, one often chooses a matrix of independent identically distributed interaction coefficients to represent the quenched random couplings between components, perhaps with some symmetry constraint or correlations between diagonally opposite pairs of elements. However, a more general set of couplings, which still preserves the statistical interchangeability of the components, could involve correlations between interaction coefficients sharing only a single row or column index. These correlations have been shown to arise naturally in systems such as the generalized Lotka-Volterra equations (gLVEs). In this work, we perform a dynamic mean-field analysis to understand how single-index correlations affect the dynamics and stability of disordered systems, taking the gLVEs as our example. We show that in-row correlations raise the level of noise in the mean-field process, even when the overall variance of the interaction coefficients is held constant. We also see that correlations between transpose pairs of rows and columns can either enhance or suppress feedback effects, depending on the sign of the correlation coefficient. In the context of the gLVEs, in-row and transpose row/column correlations thus affect both the species survival rate and the stability of ecological equilibria.
