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quant-ph2020
Corrections to Wigner-Eckart Relations by Spontaneous Symmetry Breaking
Carlo Heissenberg, Franco Strocchi
The matrix elements of operators transforming as irreducible representations of an unbroken symmetry group are governed by the well-known Wigner-Eckart relations. In the case o…
quant-ph2016
Existence of quantum time crystals
Franco Strocchi, Carlo Heissenberg
The existence of quantum time crystals is investigated and shown to be possible in pure phases defined by a state invariant under a group of space translations, as displayed by exp…