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Pré-Publication, Document De Travail Année : 2021

Bulk topological states in a new collective dynamics model

Résumé

In this paper, we demonstrate the existence of topological states in a new collective dynamics model. This individual-based model (IBM) describes self-propelled rigid bodies moving with constant speed and adjusting their rigid-body attitude to that of their neighbors. In previous works, a macroscopic model has been derived from this IBM in a suitable scaling limit. In the present work, we exhibit explicit solutions of the macroscopic model characterized by a non-trivial topology. We show that these solutions are well approximated by the IBM during a certain time but then the IBM transitions towards topologically trivial states. Using a set of appropriately defined topological indicators, we reveal that the breakage of the non-trivial topology requires the system to go through a phase of maximal disorder. We also show that similar but topologically trivial initial conditions result in markedly different dynamics, suggesting that topology plays a key role in the dynamics of this system.
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Dates et versions

hal-03119172 , version 1 (22-01-2021)
hal-03119172 , version 2 (21-01-2022)
hal-03119172 , version 3 (26-01-2022)
hal-03119172 , version 4 (04-08-2022)

Identifiants

  • HAL Id : hal-03119172 , version 2

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Pierre Degond, Antoine Diez, Mingye Na. Bulk topological states in a new collective dynamics model. 2022. ⟨hal-03119172v2⟩
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