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Within the many worlds interpretation (MWI) it is believed that, as timepasses on, the linearity of the Schr\"odinger equation together withdecoherence generate an exponentially growing tree of branches where"everything happens", provided the branches are defined for a decohering basis.By studying an example, using exact numerical diagonalization of theSchr\"odinger equation to compute the decoherent histories functional, we findthat this picture needs revision. Our example shows decoherence for historiesdefined at a few times, but a significant fraction (often the vast majority) ofbranches shows strong interference effects for histories of many times. In asense made precise below, the histories independently sample an equilibratedquantum process, and, remarkably, we find that only histories that samplefrequencies in accordance with Born's rule remain decoherent. Our resultssuggest that there is more structure in the many worlds tree than previouslyanticipated, influencing arguments of both proponents and opponents of the MWI.

Shearing Off the Tree: Emerging Branch Structure and Born's Rule in an Equilibrated Multiverse