Could anyone explain why these are invariant under U(1) X SU(2)?(adsbygoogle = window.adsbygoogle || []).push({});

H[itex]^{dagger}[/itex]H

(H[itex]^{dagger}[/itex]H)[itex]^{2}[/itex]

What is the condition for invariance under U(1) and similarly, under SU(2)?

Unfortunately, I am not familiar with tensor contraction or tensor products...

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# Why is this invariant under U(1) X SU(2) ?

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