000152020 001__ 152020 000152020 005__ 20251017144609.0 000152020 0247_ $$2doi$$a10.1088/1367-2630/aa8ed7 000152020 0248_ $$2sideral$$a143309 000152020 037__ $$aART-2017-143309 000152020 041__ $$aeng 000152020 100__ $$0(orcid)0000-0001-7276-2942$$aYllanes, D. 000152020 245__ $$aHow many dissenters does it take to disorder a flock? 000152020 260__ $$c2017 000152020 5060_ $$aAccess copy available to the general public$$fUnrestricted 000152020 5203_ $$aWe consider the effect of introducing a small number of non-aligning agents in a well-formed flock. To this end, we modify a minimal model of active Brownian particles with purely repulsive (excluded volume) forces to introduce an alignment interaction that will be experienced by all the particles except for a small minority of 'dissenters'. We find that even a very small fraction of dissenters disrupts the flocking state. Strikingly, these motile dissenters are much more effective than an equal number of static obstacles in breaking up the flock. For the studied system sizes we obtain clear evidence of scale invariance at the flocking-disorder transition point and the system can be effectively described with a finite-size scaling formalism. We develop a continuum model for the system which reveals that dissenters act like annealed noise on aligners, with a noise strength that grows with the persistence of the dissenters' dynamics. 000152020 536__ $$9info:eu-repo/grantAgreement/ES/MINECO-FEDER/FIS2015-65078-C2-1-P 000152020 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es 000152020 590__ $$a3.579$$b2017 000152020 591__ $$aPHYSICS, MULTIDISCIPLINARY$$b11 / 78 = 0.141$$c2017$$dQ1$$eT1 000152020 592__ $$a1.653$$b2017 000152020 593__ $$aPhysics and Astronomy (miscellaneous)$$c2017$$dQ1 000152020 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000152020 700__ $$aLeoni, M. 000152020 700__ $$aMarchetti, M.C. 000152020 773__ $$g19, 10 (2017), 103026 [16 pp.]$$pNew j. phys.$$tNew Journal of Physics$$x1367-2630 000152020 8564_ $$s3855959$$uhttps://zaguan.unizar.es/record/152020/files/texto_completo.pdf$$yVersión publicada 000152020 8564_ $$s591304$$uhttps://zaguan.unizar.es/record/152020/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000152020 909CO $$ooai:zaguan.unizar.es:152020$$particulos$$pdriver 000152020 951__ $$a2025-10-17-14:16:44 000152020 980__ $$aARTICLE