Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Compactification in the Lightlike Limit   We study field theories in the limit that a compactified dimension becomes
lightlike. In almost all cases the amplitudes at each order of perturbation
theory diverge in the limit, due to strong interactions among the longitudinal
zero modes. The lightlike limit generally exists nonperturbatively, but is more
complicated than might have been assumed. Some implications for the matrix
theory conjecture are discussed.

33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin