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28 March 2024 |
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Article overview
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Velocity and Speed Correlations in Hamiltonian Flocks | Mathias Casiulis
; Marco Tarzia
; Leticia F. Cugliandolo
; Olivier Dauchot
; | Date: |
14 Nov 2019 | Abstract: | We study a $2d$ Hamiltonian fluid made of particles carrying spins coupled to
their velocities. At low temperatures and intermediate densities, this
conservative system exhibits phase coexistence between a collectively moving
droplet and a still gas. The particle displacements within the droplet have
remarkably similar correlations to those of birds flocks. The center of mass
behaves as an effective self-propelled particle, driven by the droplet’s total
magnetization. The conservation of a generalized angular momentum leads to
rigid rotations, opposite to the fluctuations of the magnetization orientation
that, however small, are responsible for the shape and scaling of the
correlations. | Source: | arXiv, 1911.6042 | Services: | Forum | Review | PDF | Favorites |
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