Abstract
We investigate two distinct universality classes for probe particles
that move stochastically in a one-dimensional driven system. If the random force
that drives the probe particles is fully generated by the current fluctuations of
the driven fluid, such as when the probe particles are embedded in a ring, they
inherit the dynamical exponent of the fluid, which generically is z = 3/2. On the
other hand, if the random force has a part that is temporally uncorrelated, the
resulting motion can be described by a dynamical exponent z = 2 as considered
in previous work.
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