Multi-fold Universes, Multiverses and Many Worlds

There are different types of multiverses, depending on the Physical model considered. In most cases, it is impossible to falsify multiverse hypothesis. The Many Worlds interpretation (MWI) of quantum mechanics is a particular case that gives comfort to some when it comes to understanding quantum physics, and the Born rules, but it does not result into distinguishable experimental results from other interpretations. This paper evaluates multiverses at the light of the multi-fold theory.In a multi-fold universe, gravity emerges from Entanglement through the multi-fold mechanisms. As a result, gravity-like effects appear in between entangled particles, whether they are real or virtual. Long range, massless gravity results from entanglement of massless virtual particles. Entanglement of massive virtual particles leads to massive gravity contributions at very smalls scales. Multi-folds mechanisms also result into a spacetime that is discrete, with a random walk fractal structure, and a non-commutative geometry, that is Lorentz invariant, and where spacetime nodes and particles can be modeled with microscopic black holes. All these recover General Relativity (GR) at large scales. Gravity can therefore be added, in non-negligible ways to the Standard Model (SM) resulting into the SMG. The multi-fold mechanism and the SMG can address many open issues with the SM, and the standard cosmological model, even if the latter is modified. The SM symmetries and particles can be recovered by multi-fold space time matter induction and scattering from a ε region of 7D embedding space felt in a 4D spacetime at entry, exit and mapping to the multi-fold. In addition, the W-type multi-fold hypothesis, establishes additional multi-folds between spacetime locations in the support domain of a wavefunction, not just between entangled systems. It can also justify the Born rule.As a result, any multi-fold multiverse will have the same physics with same particles. interactions, constants and symmetries of the SMG. We will establish that multiverses do not interact with each other, and, in general, at the exception of the MWI, they do not contain all possible situations, including many copies of us, in any other possible situation. On the other hand, analyzing the effects of multi-fold deactivation, measurement or an interaction that results into deactivation of the W-type multi-folds between one part of the wavefunction of the disrupted system, the observed state, and the part associated to all other options, it results in a universe-wide brane-like object, associated to the disregarded options, floating away in AdS(5): a new World, part of the Many Worlds predicted by MWI. This is a microscopic explanation supporting the MWI. And each such world has of course the same physics as well as copies of the world in other situations.Encountering multi-fold brane-like structure in AdS(5), confirms the view of the multi-fold theory on superstrings and the M-theory. The existence of same physics imposed by multi-fold space time matter induction and scattering dooms the viability of landscape multiverses and its anthropic principle.