arXiv subjects

Martin Rosalie

Publications and source records attributed to Martin Rosalie.

6 recordsLinked to original sources

arXiv2025

Chaotic mechanism description by an elementary mixer for the template of an attractor

A template describes the topological properties of a chaotic attractor. For attractors bounded by genus-1 torus, a linking matrix describes the topology of the template. It has been shown that the template depends on the Poincaré section chosen to perform the topological characterisation: four linking matrices describe four templates of the same chaotic attractor. The purpose of this article is to present a framework providing the elementary mixer of a template to have a unique way to describe chaotic mechanism and dynamics of a chaotic attractor. In this framework, chaotic mechanisms are represented by elementary mixers defined by elementary linking matrix. Using concatenation between mixers, a classification of chaotic mechanisms is proposed to categorise them by their size.

nlin.CD↗

arXiv2025

Topological characterisation of a chaotic attractor with an additional branch generated from economic data

There are insights of chaotic properties in economic systems and data. To prove the existence of chaotic dynamics, the establishment of a deterministic model is mandatory. A global modelling tool (GPoM) is used to search for mathematical models of equations from economic data: unemployment, inflation and nominal exchange rate over 30 years. A system of three differential equations is chosen as a model, whose solution is a chaotic attractor in $\mathbb{R}^3$. The model extracted from the data is not able to fit them, but it provides equations linking those multiple economic variables and reveals significant impact of exchange rate on unemployment and inflation evolution. The topological characterisation of the chaotic attractor solution exhibits an additional branch in its first return map to the Poincaré section. Consequences of this particular structure are analysed and interpreted economically.

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arXiv2025

Structure analysis of the Lorenz-84 chaotic attractor

The structure of the Lorenz-84 attractor is investigated in this study. Its dynamics belonging to weakly dissipative chaos, classical approaches cannot be used to analyze its structure. The color tracer mapping is introduced for this purpose and used to extract the three-dimensional structure of the attractor. The analysis shows that the attractor is a non trivial case of toroidal chaos: it is organized around a period-2 cavity. Moreover, the structure reveals a new mechanism generating chaos in the attractor: a multidirectional stretching. The attractor structure is then artificially represented on a two-dimensional branched manifold and its validation performed using a set of periodic orbits previously extracted.

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arXiv2023

On the use of chaotic dynamics for mobile network design and analysis: towards a trace data generator

With the constant increase of the number of autonomous vehicles and connected objects, tools to understand and reproduce their mobility models are required. We focus on chaotic dynamics and review their applications in the design of mobility models. We also provide a review of the nonlinear tools used to characterize mobility models, as it can be found in the literature. Finally, we propose a method to generate traces for a given scenario involving moving people, using tools from the nonlinear analysis domain usually dedicated to topological analysis of chaotic attractors.

cs.MA↗

arXiv2018

Visualizing the Template of a Chaotic Attractor

Chaotic attractors are solutions of deterministic processes, of which the topology can be described by templates. We consider templates of chaotic attractors bounded by a genus-1 torus described by a linking matrix. This article introduces a novel and unique tool to validate a linking matrix, to optimize the compactness of the corresponding template and to draw this template. The article provides a detailed description of the different validation steps and the extraction of an order of crossings from the linking matrix leading to a template of minimal height. Finally, the drawing process of the template corresponding to the matrix is saved in a Scalable Vector Graphics (SVG) file.

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arXiv2016

Templates and subtemplates of Rössler attractors from a bifurcation diagram

We study the bifurcation diagram of the Rössler system. It displays the various dynamical regimes of the system (stable or chaotic) when a parameter is varied. We choose a diagram that exhibits coexisting attractors and banded chaos. We use the topological characterization method to study these attractors. Then, we details how the templates of these attractors are subtemplates of a unique template. Our main result is that only one template describe the topological structure of height attractors. This leads to a topological partition of the bifurcation diagram that gives the symbolic dynamic of all bifurcation diagram attractors with a unique template.

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