For quantum systems we develop a new method, based on a general energy‐entropy inequality, to rule out spontaneous breaking of symmetries. The main advantage of our scheme consists in its clear‐cut physical significance and its new areas of applicability; in particular we can handle discrete symmetry groups as well as continuous ones. Finally a few illustrations are discussed.
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Research Article| January 01 1984
Quantum energy‐entropy inequalities: A new method for proving the absence of symmetry breaking
M. Fannes, P. Vanheuverzwijn, A. Verbeure; Quantum energy‐entropy inequalities: A new method for proving the absence of symmetry breaking. J. Math. Phys. 1 January 1984; 25 (1): 76–78. https://doi.org/10.1063/1.525999
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