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models:speculative_models:grand_unified_theories [2018/03/26 15:15]
jakobadmin [History]
models:speculative_models:grand_unified_theories [2018/05/22 14:23] (current)
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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 +----
 +
 +**Major Questions still unsolved in GUTs**
 +
 +  * The Hierarchy Problem, i.e. why $M_W/​M_{GUT} <​10^{-12}$.
 +  * The strong CP problem.
 +  * The cosmological constant problem.
 +  * The absence of gravity.
 +  * The family repetition problem, i.e. why are there three families.
 +  * The fermion mass spectrum. ​
 +
 +GUTs have nothing to say on these matters.
  
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models/speculative_models/grand_unified_theories.1522070154.txt.gz · Last modified: 2018/03/26 13:15 (external edit)