Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Nonlinear Sigma Model With Distributed Adaptive Mesh Refinement   An adaptive mesh refinement (AMR) scheme is implemented in a distributed
environment using Message Passing Interface (MPI) to find solutions to the
nonlinear sigma model. Previous work studied behavior similar to black hole
critical phenomena at the threshold for singularity formation in this flat
space model. This work is a follow-up describing extensions to distribute the
grid hierarchy and presenting tests showing the correctness of the model.

23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th