98-583 van Enter A. C. D., Fern\'andez R.
Problems with the definition of renormalized Hamiltonians for momentum-space renormalization transformations (48K, LATeX 2e) Sep 2, 98
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Abstract. For classical lattice systems with finite (Ising) spins, we show that the implementation of momentum-space renormalization at the level of Hamiltonians runs into the same type of difficulties as found for real-space transformations: Renormalized Hamiltonians are ill-defined in certain regions of the phase diagram.

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