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- W2027418027 abstract "The variational version of the Weinstein-Aronszajn method (1935), for constructing sequences of intermediate Hamiltonians with spectra converging to the exact eigenvalues from below, is revived for lattice theories. A first test is performed on the critical Ising quantum chain and U(1)-invariant gauge systems. Special emphasis is put on applications to degenerate levels. A related upper bound construction is also discussed." @default.
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- W2027418027 date "1989-05-21" @default.
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- W2027418027 title "Systematic lower bounds for lattice Hamiltonians" @default.
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- W2027418027 doi "https://doi.org/10.1088/0305-4470/22/10/013" @default.
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