Perturbations and streaming motions on large scales Free

The problem of the interpretation of large-scale streaming motions on the 50–100 Mpc scale is discussed. We develop a method of conditional correlations, which allows us to find the mean value and dispersion of large-scale velocities for a fixed motion of an observer. The scale and the amplitude of possible perturbations are compared with constraints obtained by the ‘Relict’ experiment. Perturbations |$\Delta\varrho/\varrho\simeq0.1-0.3$| on the 50–100 Mpc scale seem to be needed to overcome the contradictions between modern cosmological models and huge, bulk motion on large scales. The perturbations with the same amplitude but on the 200–300 Mpc scale are excluded by |$\Delta T/T$| constraints.