
Science – "Every high school senior excited about physics should be able to see that the paper is just a long sequence of childish misunderstandings" sums up one physicist's review of Garrett Lisi's "An Exceptionally Simple Theory of Everything", and details the abuse of mathematics behind this unified theory controversy.
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The role of the E8 group in his picture is therefore completely unphysical. Because different components of the E8 multiplet are assumed to be particles with completely different properties, the E8 symmetry is broken at stage zero. There is no E8 symmetry - and there can't be any E8 symmetry - that would actually relate these different particles.