Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First passage statistics for diffusing diffusivity   A rapidly increasing number of systems is identified in which the stochastic
motion of tracer particles follows the Brownian law $\langle\mathbf{r}^2(t)
\rangle\simeq Dt$ yet the distribution of particle displacements is strongly
non-Gaussian. A central approach to describe this effect is the diffusing
diffusivity (DD) model in which the diffusion coefficient itself is a
stochastic quantity, mimicking heterogeneities of the environment encountered
by the tracer particle on its path. We here quantify in terms of analytical and
numerical approaches the first passage behaviour of the DD model. We observe
significant modifications compared to Brownian-Gaussian diffusion, in
particular that the DD model may have a more efficient first passage dynamics.
Moreover we find a universal crossover point of the survival probability
independent of the initial condition.

18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga