Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multigrid solution of a path integral formulation for the hydrogen atom   An efficient multigrid Monte-Carlo algorithm for calculating the ground state
of the hydrogen atom using path integral is presented. The algorithm uses a
unigrid approach. The action integral near r=0 is modified so that the correct
values of observables are obtained. It is demonstrated that the critical slow
down (CSD) is eliminated. Finally, the algorithm is compared to the staging
algorithm.

36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom