Quantum Phase Transitions and the Extended Coupled Cluster Method

Details Quantum Phase Transitions and the Extended Coupled Cluster Method Quantum Phase Transitions and the Extended Coupled Cluster Method

2000-08-04

arxiv.org/abs/hep-ph/0008040v1

Phys.Rev. E63 (2001) 037103

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1103/PhysRevE.63.037103

We discuss the application of an extended version of the coupled cluster method to systems exhibiting a quantum phase transition. We use the lattice O(4) non-linear sigma model in (1+1)- and (3+1)-dimensions as an example. We show how simple predictions get modified, leading to the absence of a phase transition in (1+1) dimensions, and strong indications for a phase transition in (3+1) dimensions.

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