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What is the physical meaning of the vacuum state in the BCS ground state?

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I am not sure how to crosspost here from stackexchange.

Can someone please help this poor bloke?:

https://physics.stackexchange.com/questions/767222/what-is-the-physical-meaning-of-the-vacuum-state-in-the-bcs-ground-state#comment1721506_767222

I took a course on Condesed Matter Physics 1 that covered a little bit of Tinkham's book not all of it, so I cannot help more than I have suggested there.

CHEERS!

asked Jun 10, 2023 in Theoretical Physics by MathematicalPhysicist (205 points) [ no revision ]

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