If we accept the Many Worlds Interpretation literally, is it not possible there is propagation of waves directly between worlds? For example, given that ‘every eventuality exists’ in MWI, there should, amongst others, be infinities of only-minutely-different worlds in superposition. We can imagine one infinite set of worlds such that each has basically the ‘same wave’ passing across it but when superimposed the waves in each world are infinitesimally out of phase and spatially separated. (Planck amounts). Could we not suppose this would allow a kind of diagonal propagation across worlds? (We imagine them stacked and lined up next to each other -slightly staggered to infinity) Would we be able to test for this, if the waves crossing worlds are ubiquitous? I imagine with uncountable infinities of these sets of worlds, the crossing waves would head in all directions.. if this isn’t the case, why not - given some people accept waves interfere across many worlds?