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- W3100493225 abstract "We study equilibrium statistical mechanics of Fermion lattice systems which require a different treatment compared with spin lattice systems due to the non-commutativity of local algebras for disjoint regions. Our major result is the equivalence of the KMS condition and the variational principle with a minimal assumption for the dynamics and without any explicit assumption on the potential. Its proof applies to spin lattice systems as well, yielding a vast improvement over known results. All formulations are in terms of a C*-dynamical systems for the Fermion (CAR) algebra [Formula: see text] with all or a part of the following assumptions: (I) The interaction is even, namely, the dynamics α t commutes with the even-oddness automorphism Θ. (Automatically satisfied when (IV) is assumed.) (II) The domain of the generator δ α of α t contains the set [Formula: see text] of all strictly local elements of [Formula: see text]. (III) The set [Formula: see text] is the core of δ α . (IV) The dynamics α t commutes with lattice translation automorphism group τ of [Formula: see text]. A major technical tool is the conditional expectation from [Formula: see text] onto its C*-subalgebras [Formula: see text] for any subset I of the lattice, which induces a system of commuting squares. This technique overcomes the lack of tensor product structures for Fermion systems and even simplifies many known arguments for spin lattice systems. In particular, this tool is used for obtaining the isomorphism between the real vector space of all *-derivations with their domain [Formula: see text], commuting with Θ, and that of all Θ-even standard potentials which satisfy a specific norm convergence condition for the one point interaction energy. This makes it possible to associate a unique standard potential to every dynamics satisfying (I) and (II). The convergence condition for the potential is a consequence of its definition in terms of the *-derivation and not an additional assumption. If translation invariance is imposed on *-derivations and potentials, then the isomorphism is kept and the space of translation covariant standard potentials becomes a separable Banach space with respect to the norm of the one point interaction energy. This is a crucial basis for an application of convex analysis to the equivalence proof in the major result. Everything goes in parallel for spin lattice systems without the evenness assumption (I)." @default.
- W3100493225 created "2020-11-23" @default.
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- W3100493225 date "2003-04-01" @default.
- W3100493225 modified "2023-10-18" @default.
- W3100493225 title "EQUILIBRIUM STATISTICAL MECHANICS OF FERMION LATTICE SYSTEMS" @default.
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- W3100493225 doi "https://doi.org/10.1142/s0129055x03001606" @default.
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