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models:speculative_models:grand_unified_theories [2018/04/08 17:15] georgefarr ↷ Page moved from theories:speculative_theories:grand_unified_theories to models:speculative_models:grand_unified_theories |
models:speculative_models:grand_unified_theories [2018/05/22 14:23] jakobadmin [Criticism] |
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- | ====== Grand Unified Theories ====== | + | ====== Grand Unified Models ====== |
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<blockquote>“People can construct models with higher symmetries and stand on their nose and try to avoid proton decay,” Nanopoulos said. “OK, you can do it, but … you cannot show it to your mother with a straight face.” https://www.quantamagazine.org/20161215-proton-decay-grand-unification/</blockquote> | <blockquote>“People can construct models with higher symmetries and stand on their nose and try to avoid proton decay,” Nanopoulos said. “OK, you can do it, but … you cannot show it to your mother with a straight face.” https://www.quantamagazine.org/20161215-proton-decay-grand-unification/</blockquote> | ||
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+ | ---- | ||
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+ | **Major Questions still unsolved in GUTs** | ||
+ | |||
+ | * The Hierarchy Problem, i.e. why $M_W/M_{GUT} <10^{-12}$. | ||
+ | * The absence of gravity | ||
+ | * The family repetition problem, i.e. why are there three families. | ||
+ | * The fermion mass spectrum. | ||
+ | * | ||
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