# A hybrid heteroclinic cycle

## TL;DR

This paper presents a robust heteroclinic cycle in four-dimensional space combining features of various low-dimensional cycles, highlighting its instability and the challenges in analyzing its stability with standard methods.

## Contribution

It introduces a novel hybrid heteroclinic cycle in -dimensional space with mixed features and discusses the limitations of existing stability analysis techniques.

## Key findings

- Cycle exhibits mixed features of simple, quasi-simple, and pseudo-simple cycles.
- The cycle is likely completely unstable due to subcycle instabilities.
- Standard return map methods are insufficient for analyzing this hybrid cycle.

## Abstract

Using a vector field in $\mathbb{R}^4$, we provide an example of a robust heteroclinic cycle between two equilibria that displays a mix of features exhibited by well-known types of low-dimensional heteroclinic structures, including simple, quasi-simple and pseudo-simple cycles. Our cycle consists of two equilibria on one coordinate axis and two connections. One of the connections is one-dimensional while the other is two-dimensional. We compare our heteroclinic cycle to others in the literature that are similar in architecture, and illustrate how the standard methods used to analyse those cycles fail to provide sufficient information on the attraction properties of our example. The instability of two subcycles contained in invariant three-dimensional subspaces seems to indicate that our cycle is generically completely unstable. Although this cycle is one of the simplest possible and exists in low-dimension, the complete study of the stability of our cycle by using the standard techniques for return map reduction is not possible given the hybrid nature of the return map.