Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Global Existence for a Kinetic Model of Pattern Formation with
  Density-suppressed Motilities   In this paper, we consider global existence of classical solutions to the
following kinetic model of pattern formation \begin{equation} \begin{cases}
u_t=\Delta (\gamma (v)u)+\mu u(1-u) -\Delta v+v=u \end{cases} \qquad (0.1)
\end{equation}in a smooth bounded domain $\Omega\subset\mathbb{R}^n$, $n\geq1$
with no-flux boundary conditions. Here, $\mu\geq0$ is any given constant. The
function $\gamma(\cdot)$ represents a signal-dependent diffusion motility and
is decreasing in $v$ which models a density-suppressed motility in process of
stripe pattern formation through self-trapping mechanism [8,20]. The major
difficulty in analysis lies in the possible degeneracy of diffusion as
$v\nearrow+\infty.$ In the present contribution, based on a subtle observation
of the nonlinear structure, we develop a new method to rule out finite-time
degeneracy in any spatial dimension for all smooth motility function satisfying
$\gamma(v)>0$ and $\gamma'(v)\leq0$ for $v\geq0$. Then we prove global
existence of classical solution for (0.1) in the two-dimensional setting with
any $\mu\geq0$. Moreover, the global solution is proven to be uniform-in-time
bounded if either $1/\gamma$ satisfies certain polynomial growth condition or
$\mu>0.$ Besides, we pay particular attention to the specific case
$\gamma(v)=e^{-v}$ with $\mu=0$. A novel critical phenomenon in the
two-dimensional setting is observed where blowup takes place in infinite time
rather than finite time in our model.

27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin