Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cohesive energy, stability and structural transitions in polyelectrolyte
  bundles   A lattice of uniformly charged, infinitesimally thin, rods decorated with an
ordered array of counterions exhibits anomalous behavior as the spacing between
the rods is varied. In particular, the counterion lattice undergoes a sequence
of structural shearing, or "tilting," phase transformations as the spacing
between the rods decreases. The potential implications of this behavior with
respect to the packaging of biologically relevant polyelectrolytic molecules
are commented upon.

35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg