Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Confined H(1s) and H(2p) under different geometries   In this paper the Diffusion Monte Carlo (DMC) method is applied to the
confined hydrogen atom with different confinement geometries. This approach is
validated using the much studied spherical and cylindrical confinements and
then applied to cubical and squared ones, for which data are not available, as
new applications of the method relevant to solid state physics. The energy
eigenvalues of the ground state and one low-lying excited state are reported as
a function of the characteristic confinement length.

10
The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an