Abstract
We present a detailed study of cooperative and correlated dynamics in a 2D model system for soft active matter that undergoes motility-induced phase separation (MIPS). Particle displacement correlation functions reveal increasing dynamical heterogeneity with increasing activity. In the phase-separated regime as well as in the truly glassy phase, transverse mean squared displacements as well as shear strain correlations exhibit a regime of long-range behaviour with strain correlations decaying as r−2 on time scales short compared to the rotational diffusion time. We attribute the origin of the r−2 decay to elastic interactions that lead to similar behaviour in passive glass formers.
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