Dark matter is and always has been curve-fitting to residuals between theory and data. There is no there there, every map you see is nothing more than subtracting theory from data and having residuals left over. Dark energy is similar except much more coarse, in that the "model" is just a single parameter with a very simplistic interpretation.
Neither are theories, but good luck coming away unscathed when mentioning this in the presence of ΛCDM dogmatists.
Neither are theories, but good luck coming away unscathed when mentioning this in the presence of ΛCDM dogmatists.