Recent content by jean194

Thanks I will read that.

Thanks, the pdf is very interesting. Tell me if I'm wrong but from what I understand, the uniqueness of the ground state and the notion of tower of states is fundamental in spontaneous symmetry breaking. The case of ferromagnetism is special in the sense that the ground state is degenerate and...

Hello, Today I found this paper and this one where P.W. Anderson says that there is no broken symmetry in ferromagnetism because the ground state is an eigenstate of the spin rotation operator. And so we don't have in this system Goldstone's mode for example. But I thought spin waves were...