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Characterization of Reflection Positivity: Majoranas and Spins

We study linear functionals on a Clifford algebra (algebra of Ma- joranas) equipped with a reflection automorphism. For Hamiltonians that are functions of Majoranas or of spins, we find necessary and sufficient conditions on the coupling constants for reflection positivity to hold. One can easily check these conditions in concrete models. We illustrate this by discussing a number of spin systems with nearest-neighbor and long-range interactions.

preprint2015arXivOpen access
Arthur JaffeBas Janssens
cond-mat.stat-mechmath-phmath.MPquant-ph
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Arthur JaffeBas Janssens

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