How does gauge bundle breaking occur in Yang-Mills theory with SU(5)?

meha
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Hello,
suppose you start with Yang Mills theory with some gauge group G, for example SU(5). Then you turn on a gauge bundle, say a U(1) bundle, and the group breaks down. I know that from hearsay but I wonder how would you describe that explicitly in formulas?
meha
 
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what du you mean by "turn on a gauge bundle"? you already have a SU(5) bundle, so whyt should U(1) be? U(1)*SU(5)?
 

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