Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Hierarchical Reference Theory as applied to square well fluids of
  variable range   Continuing our investigation into the numerical properties of the
Hierarchical Reference Theory, we study the square well fluid of range lambda
from slightly above unity up to 3.6. After briefly touching upon the core
condition and the related decoupling assumption necessary for numerical
calculations, we shed some light on the way an inappropriate choice of the
boundary condition imposed at high density may adversely affect the numerical
results; we also discuss the problem of the partial differential equation
becoming stiff for close-to-critical and sub-critical temperatures. While
agreement of the theory's predictions with simulational and purely theoretical
studies of the square well system is generally satisfactory for lambda greater
than about 2, the combination of stiffness and the closure chosen is found to
render the critical point numerically inaccessible in the current formulation
of the theory for most of the systems with narrower wells. The mechanism
responsible for some deficiencies is illuminated at least partially and allows
us to conclude that the specific difficulties encountered for square wells are
not likely to resurface for continuous potentials.

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The categories of this paper are: math
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The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
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The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
18
The categories of this paper are: econ
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The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph