For the Quantum Heisenberg Ferromagnet, Tao to the Proof of a Phase Transition

Details For the Quantum Heisenberg Ferromagnet, Tao to the Proof of a Phase Transition For the Quantum Heisenberg Ferromagnet, Tao to the Proof of a Phase Transition

2002-02-27

arxiv.org/abs/math-ph/0202044v1

Physics

Mathematical Physics

11 pages

Scientific paper

We present the outline of a proof for the 3-d phase transition which we hope to carry forth. At the same time this paper provides some physical understanding of the phase transition, in the flavor of relatively simple arguments from an undergraduate course. A number of directions for mathematical research, interesting in their own right, will be suggested by aspects of the development. We hope and believe that readers will be enticed by the naturalness and beauty of the path; some perhaps even, big game veterans, sniffing the quarry, will be ready to join the hunt. The central construct views the trace, Tr(exp(-beta*H)), as a lattice gas of polymers, each representing a cycle in the permutation group, with hard core interactions. The activities of the polymers have expressions as arising from the main conjecture of the paper. The estimates lead to a phase transition in 3-d, but not 2-d. This occurs via the same argument that a random walk in 2-d has certain return to the origin, but not so for a random walk in 3-d.

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