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Bill_K
#5
Feb22-12, 07:56 AM
Sci Advisor
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Sure enough, many GUTs do contain constraints that relate the charge of different particles. And for a time, people thought that pursuing GUTs would turn out to be fruitful. Unfortunately they also contain a prediction about the rate at which protons decay, which experiment has failed to detect. While GUTs are an appealing idea, they fail to describe the world we live in, and are not at present a serious alternative to the Standard Model.