In this paper, we start from conventional GUTs and ToEs and discuss their challenges due not only to the lack of observations of proton decays and magnetic monopoles, but also to the fact that when gravity is considered, especially with mechanisms à la multi-folds, where gravity emerges from entanglement, both these phenomena are expected to not exist. With only a few exception, ToEs are badly hurt, including many superstrings, and most GUTs are knocked out. Because of the massive gravity at small scale contributed by entanglement in a multi-fold universe, we encounter new lifecycles for charged black holes and discover that, at small scales, gravity is no more the weakest interaction. In fact, sources and carriers of all interactions democratically carry gravity along with their interaction the same way and all interactions have similar strength. It becomes a new symmetric state with an Ultimate Unification of all the forces, but without the hierarchies of symmetry groups typically involved in GUTs, and without intermediate GUTs not involving gravity from the get-go. These results are obtained in a multi-fold universe, but with discussions of what can be said about our real universe.
Charged scalar perturbations on charged black holes in de Rham-Gabadadze-Tolley massive gravity
