Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effective Lagrangians for Scalar Fields and Finite Size Effects in Field
  Theory   We discuss the approach of effective field theory on a d-dimensional
Euclidean space in a scalar theory with two different mass scales in the
presence of flat surfaces. Then considering Dirichlet and Neumann boundary
conditions, we implement the renormalization program in the lambda phi^{4}
theory in a region bounded by two parallel hyperplanes in the one-loop
approximation.

8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con