6 papers · 1 filter
True and Quasi Long-Range Order in Malthusian Flocks
Patrick Jentsch, Anna Erzberger
Living matter undergoes continuous turnover. The hydrodynamic theory of Malthusian flocks describes polar active matter with turnover, but its phase diagram and nonlinear scaling b…
Hydrodynamics, Renormalization Group, and Universality Classes Far from Equilibrium
Patrick Jentsch, Chiu Fan Lee
Universality is one of the central organising principles of modern physics, explaining why systems with vastly different microscopic constituents can exhibit identical large-scale…
Diversity of critical phenomena in the ordered phase of polar active fluids
Patrick Jentsch, Chiu Fan Lee
We present a comprehensive analytical linear stability analysis of the Toner-Tu model for polar active fluids in the ordered phase. Our results provide exact instability criteria a…
Response to the comment on The inconvenient truth about flocks by Chaté and Solon
Leiming Chen, Patrick Jentsch, Chiu Fan Lee +3
This is our response to the comment arXiv:2504.13683 posted by Chaté and Solon in reference to our preprint arXiv:2503.17064
The inconvenient truth about flocks
Leiming Chen, Patrick Jentsch, Chiu Fan Lee +3
We reanalyze the hydrodynamic theory of "flocks" that is, polar ordered "dry" active fluids in two dimensions. For "Malthusian" flocks, in which birth and death cause the density t…
Can exact scaling exponents be obtained using the renormalization group? Affirmative evidence from incompressible polar active fluids
Patrick Jentsch, Chiu Fan Lee
In active matter systems, non-Gaussian, exact scaling exponents have been claimed in a range of systems using perturbative renormalization group (RG) methods. This is unusual compa…