Griffiths inequalities for noninteractingN-vector (classical heisenberg) models and applications to interacting systems |
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| Authors: | Bernhard Baumgartner |
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| Institution: | 1. Institut für Theoretische Physik, Universit?t Wien, Vienna, Austria
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| Abstract: | An order relation for tensors is defined. With this ordering it is shown that in noninteractingN-vector models 〈σAσB〉?〈σA〉〈σB〉 is positive. Applications to interacting models include a proof for the alignment of spins and the subadditivity of the free energy. |
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