Spin-Waves without Spin-Waves: A Case for Soliton Propagation in Starling Flocks
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908479025840128 |
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| author | Cavagna, Andrea Cimino, Guido Cristín, Javier Fiorini, Matteo Giardina, Irene Giustiniani, Angelo Grigera, Tomás S. Melillo, Stefania Palombella, Roberto A. Parisi, Leonardo Ponno, Antonio Scandolo, Mattia Stamler, Zachary S. |
| author_facet | Cavagna, Andrea Cimino, Guido Cristín, Javier Fiorini, Matteo Giardina, Irene Giustiniani, Angelo Grigera, Tomás S. Melillo, Stefania Palombella, Roberto A. Parisi, Leonardo Ponno, Antonio Scandolo, Mattia Stamler, Zachary S. |
| contents | Collective turns in starling flocks propagate linearly with negligible attenuation, indicating the existence of an underdamped sector in the dispersion relation. Beside granting linear propagation of the phase perturbations, the real part of the frequency should also yield a spin-wave form of the unperturbed correlation function. However, new high-resolution experiments on real flocks show that underdamped traveling waves coexist with an overdamped Lorentzian correlation. Theory and experiments are reconciled once we add to the dynamics a Fermi-Pasta-Ulam-Tsingou term. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_19665 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spin-Waves without Spin-Waves: A Case for Soliton Propagation in Starling Flocks Cavagna, Andrea Cimino, Guido Cristín, Javier Fiorini, Matteo Giardina, Irene Giustiniani, Angelo Grigera, Tomás S. Melillo, Stefania Palombella, Roberto A. Parisi, Leonardo Ponno, Antonio Scandolo, Mattia Stamler, Zachary S. Statistical Mechanics Soft Condensed Matter Biological Physics Quantitative Methods Collective turns in starling flocks propagate linearly with negligible attenuation, indicating the existence of an underdamped sector in the dispersion relation. Beside granting linear propagation of the phase perturbations, the real part of the frequency should also yield a spin-wave form of the unperturbed correlation function. However, new high-resolution experiments on real flocks show that underdamped traveling waves coexist with an overdamped Lorentzian correlation. Theory and experiments are reconciled once we add to the dynamics a Fermi-Pasta-Ulam-Tsingou term. |
| title | Spin-Waves without Spin-Waves: A Case for Soliton Propagation in Starling Flocks |
| topic | Statistical Mechanics Soft Condensed Matter Biological Physics Quantitative Methods |
| url | https://arxiv.org/abs/2505.19665 |