Of particular interest to readers of this column is the last portion of the book, chapters 10-13. Next, Tegmark introduces the emerging “multiverse” theories: Level I (the universe external to ours, as a result of the inflation at the big bang), Level II (the ensemble of pocket universes, the result of “eternal inflation”), Level III (the bifurcating universe, as a consequence of the “many worlds” formulation of quantum mechanics) and Level IV (Tegmark’s own notion of all mathematical structures, which he proposes actually exist and constitute the ultimate “stuff” of existence). Tegmark starts out by exploring a list of questions, such as “How big is space?,” “Where did our solar system come from?” and “Where did our big bang come from?.” He then examines some of the difficulties with current theories, including both the successes and failures of the “inflation” cosmology of the very early universe. In this very lucidly written book, Tegmark takes the reader on a tour of modern physics and then introduces his theory of the ultimate nature of the universe. Physicist Max Tegmark has just published an interesting new book entitled Our Mathematical Universe: My Quest for the Ultimate Nature of Reality.
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