Theoretical and Mathematical Physics

, Volume 194, Issue 3, pp 377–383 | Cite as

Zone Structure of the Renormalization Group Flow in a Fermionic Hierarchical Model

  • M. D. Missarov
  • A. F. Shamsutdinov


The Gaussian part of the Hamiltonian of the four-component fermion model on a hierarchical lattice is invariant under the block-spin transformation of the renormalization group with a given degree of normalization (the renormalization group parameter). We describe the renormalization group transformation in the space of coefficients defining the Grassmann-valued density of a free measure as a homogeneous quadratic map. We interpret this space as a two-dimensional projective space and visualize it as a disk. If the renormalization group parameter is greater than the lattice dimension, then the unique attractive fixed point of the renormalization group is given by the density of the Grassmann delta function. This fixed point has two different (left and right) invariant neighborhoods. Based on this, we classify the points of the projective plane according to how they tend to the attracting point (on the left or right) under iterations of the map. We discuss the zone structure of the obtained regions and show that the global flow of the renormalization group is described simply in terms of this zone structure.


renormalization group fermion model projective space zone structure 


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© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Kazan Federal UniversityKazanRussia

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