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The symmetron is a dark energy and dark matter candidate that formstopological defects in the late-time universe and holds promise to resolve someof the cosmological tensions. We perform high resolution simulations of thedynamical and non-linear (a)symmetron using the recently developed relativisticN-body code asevolution. By extensively testing the temporal and spatialconvergence of domain decompositioning and domain wall stability, we findcriteria and physical intuition for the convergence. We apply the resolutioncriteria to run five high resolution, $1280^3$ grids and 500 Mpc/h boxsize,simulations of the (a)symmetron and consider the behaviour of the scalar fieldand the domain walls in each scenario. We find the effect on the matter powerspectra, the halo mass function and observables computed over the pastlightcone of an observer such as the integrated Sachs-Wolfe and non-linearRees-Sciama effect (ISW-RS) and the lensing, compared to LCDM. We show localoscillations of the fifth force strength and the formation of planar structuresin the density field. The dynamics of the field is visualised in animationswith high resolution in time. The simulation code is made publicly available.

asimulation: Domain formation and impact on observables in resolved cosmological simulations of the (a)symmetron