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unixronin: Galen the technomage, from Babylon 5: Crusade (Default)
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[identity profile] smandal.livejournal.com
Thursday, July 2nd, 2009 07:49 am (UTC)
There is a certain class of GUT models which predict proton lifetimes shorter than 10^33 years, so they are problematic.

Whether or not that is a practical concern I guess depends on your aims. :)

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