10 citations · 13 across the 5 of their papers we have counts for
5 papers
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…
Generalized criteria of symmetry breaking. A strategy for quantum time crystals
Carlo Heissenberg, Franco Strocchi
The aim of this paper is to propose a criterion of spontaneous symmetry breaking that makes reference to the properties of pure phases defined by a translationally invariant state.…
Convergent and Divergent Series in Physics
Carl M. Bender, Carlo Heissenberg
The aim of this review, based on a series of four lectures held at the 22nd "Saalburg" Summer School (2016), is to cover selected topics in the theory of perturbation series and th…
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…
Gauge Invariance and Symmetry Breaking by Topology and Energy Gap
Carlo Heissenberg, Franco Strocchi
For the description of observables and states of a quantum system, it may be convenient to use a canonical Weyl algebra of which only a subalgebra , with a non-trivial…