Generalised Holstein-Primakoff theory for anharmonic lattices

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, , Citation L R Mead and N Papanicolaou 1983 J. Phys. A: Math. Gen. 16 4135 DOI 10.1088/0305-4470/16/17/028

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1 Dept. of Phys., Washington Univ., St. Louis, MO, USA

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Abstract

The spectrum of elementary excitations for scalar field theories on a lattice is calculated in the large-N approximation and is found to consist of two distinct branches, one of which may be interpreted as a collective mode. The method of calculation is based on a generalised Holstein-Primakoff theory for the real symplectic algebra.

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10.1088/0305-4470/16/17/028