Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Derivation of a non-objective Oldroyd model from the Boltzmann equation   I calculate the hydrodynamic limit of the BGK approximation of the Boltzmann
equation for the case of a long stress relaxation time and find that the stress
obeys a viscoelastic constitutive equation. The constitutive equation is
different from standard constitutive equations used for polymeric liquids in
that it is not ``objective'' because inertial effects are important. I
calculate the exact solution for the stresses for simple shear flow and
elongational flow.

5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat