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The energy-spin Green function of Ising quantum field theory in small external magnetic fields forT>Tc

Authors
Journal
Physics Letters A
0375-9601
Publisher
Elsevier
Publication Date
Volume
170
Issue
3
Identifiers
DOI: 10.1016/0375-9601(92)91062-v
Disciplines
  • Physics

Abstract

Abstract The leading behavior of the three-point energy-spin Green function of two-d imensional Ising quantum field theory in a small external magnetic field is investigated in the scaling limit. Using the cluster expansion, we obtain the function to order h for T> T c in large separations, which is related to the modified Bessel function of the third kind.

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