Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong non-exponential relaxation and memory effects in a fluid with
  non-linear drag   We analyse the dynamical evolution of a fluid with non-linear drag, for which
binary collisions are elastic, described at the kinetic level by the
Enskog-Fokker-Planck equation. This model system, rooted in the theory of
non-linear Brownian motion, displays a really complex behaviour when quenched
to low temperatures. Its glassy response is controlled by a long-lived
non-equilibrium state, independent of the degree of non-linearity and also of
the Brownian-Brownian collisions rate. The latter property entails that this
behaviour persists in the collisionless case, where the fluid is described by
the non-linear Fokker-Planck equation. The observed response, which includes
non-exponential, algebraic, relaxation and strong memory effects, presents
scaling properties: the time evolution of the temperature -- for both
relaxation and memory effects -- falls onto a master curve, regardless of the
details of the experiment. To account for the observed behaviour in
simulations, it is necessary to develop an extended Sonine approximation for
the kinetic equation -- which considers not only the fourth cumulant but also
the sixth one.

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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con