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The growth rate of matter perturbations is computed in a magnetizedenvironment for the LambdaCDM and wCDM paradigms. It is argued that the baryonsdo not necessarily follow into the dark matter potential wells after they arereleased from the drag of the photons. The baryonic evolution equations inherita forcing term whose explicit form depends on the plasma description and can bededuced, for instance, in the resistive magnetohydrodynamical approximation.After deriving an analytical expression for the growth rate applicable whendark energy does not cluster, the effects of relativistic corrections and ofthe inhomogeneities associated with the other species of the plasma are takeninto account numerically. The spectral amplitudes and slopes of the stochasticmagnetic background are selected to avoid appreciable distortions in themeasured temperature and polarization anisotropies of the Cosmic MicrowaveBackground. The growth of structures in the current paradigms of structureformation represents a complementary probe of large-scale magnetism in the sameway as the shape of the growth factor and the associated indices can be used,in the conventional lore, to discriminate between competing scenarios of darkenergy or even to distinguish different models of gravity.

Growth rate of matter perturbations as a probe of large-scale magnetism