Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Green's function for a n-dimensional closed, static universe and with a
  spherical boundary   We construct the Hadamard Green's function by using the eigenfunction, which
are obtained by solving the wave equation for the massless conformal scalar
field on the S^n-1 of a n-dimensional closed, static universe. We also consider
the half space case with both the Dirichlet and the Neumann boundary
conditions. Solving of eigenfunction and eigenvalues of the corresponding field
equation is interesting since the Casimir energy could be calculated
analytically by various methods.

29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg