Reply to" Comment on" Velocity and Speed Correlations in Hamiltonian Flocks"

M Casiulis, M Tarzia, LF Cugliandolo… - arXiv preprint arXiv …, 2019 - arxiv.org
arXiv preprint arXiv:1912.09202, 2019arxiv.org
In their comment on our work (ArXiv: 1912.07056 v1), Cavagna\textit {et al.} raise several
interesting points on the phenomenology of flocks of birds, and conduct additional data
analysis to back up their points. In particular, they question the existence of rigid body
rotations in flocks of birds. In this reply, we first clarify the notions of rigid body rotations, and
of rigidity itself. Then, we justify why we believe that it is legitimate to wonder about their
importance when studying the spatial correlations between speeds in flocks of birds.
In their comment on our work (ArXiv:1912.07056v1), Cavagna \textit{et al.} raise several interesting points on the phenomenology of flocks of birds, and conduct additional data analysis to back up their points. In particular, they question the existence of rigid body rotations in flocks of birds. In this reply, we first clarify the notions of rigid body rotations, and of rigidity itself. Then, we justify why we believe that it is legitimate to wonder about their importance when studying the spatial correlations between speeds in flocks of birds.
arxiv.org
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