Journal of Nonlinear Science

, Volume 22, Issue 3, pp 277–325 | Cite as

Bifurcation Diagrams and Heteroclinic Networks of Octagonal H-Planforms

  • Grégory Faye
  • Pascal ChossatEmail author


This paper completes the classification of bifurcation diagrams for H-planforms in the Poincaré disc \(\mathcal {D}\) whose fundamental domain is a regular octagon. An H-planform is a steady solution of a PDE or integro-differential equation in \(\mathcal {D}\), which is invariant under the action of a lattice subgroup Γ of U(1,1), the group of isometries of \({\mathcal{D}}\). In our case Γ generates a tiling of \(\mathcal {D}\) with regular octagons. This problem was introduced as an example of spontaneous pattern formation in a model of image feature detection by the visual cortex where the features are assumed to be represented in the space of structure tensors. Under ‘generic’ assumptions the bifurcation problem reduces to an ODE which is invariant by an irreducible representation of the group of automorphisms \(\mathcal {G}\) of the compact Riemann surface \(\mathcal {D}/\varGamma \). The irreducible representations of \(\mathcal {G}\) have dimensions one, two, three and four. The bifurcation diagrams for the representations of dimensions less than four have already been described and correspond to well-known group actions. In the present work we compute the bifurcation diagrams for the remaining three irreducible representations of dimension four, thus completing the classification. In one of these cases, there is generic bifurcation of a heteroclinic network connecting equilibria with two different orbit types.


Equivariant bifurcation analysis Neural fields Poincaré disc Heteroclinic network 

Mathematics Subject Classification (2000)

37C80 37C29 58K05 58K70 92B20 


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.NeuroMathComp LaboratoryINRIAParisFrance
  2. 2.J-A Dieudonné LaboratoryCNRS and University of Nice Sophia-AntipolisNice Cedex 02France

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