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The growth of correlation lengths in equilibrium glass-forming liquids nearthe glass transition is considered a critical finding in the quest tounderstand the physics of glass formation. These understandings helped usunderstand various dynamical phenomena observed in supercooled liquids. It isknown that at least two different length scales exist - one is of thermodynamicorigin, while the other is dynamical in nature. Recent observations of glassydynamics in biological and synthetic systems where the external or internaldriving source controls the dynamics, apart from the usual thermal noise, ledto the emergence of the field of active matter. A question of whether thephysics of glass formation in these active systems is also accompanied bygrowing dynamic and static lengths is indeed timely. In this article, we probethe growth of dynamic and static lengths in a model active glass system usingrod-like elongated probe particles, an experimentally viable method. We showthat the dynamic and static lengths in these non-equilibrium systems grow muchmore rapidly than their passive counterparts. We then offer an understanding ofthe violation of the Stokes-Einstein relation and Stokes-Einstein-Debyerelation using these lengths via a scaling theory.

A Novel Method to Probe the Pronounced Growth of Correlation Lengths in an Active Glass-forming Liquids using Elongated Probe