Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long Time Algebraic Relaxation in Chaotic Billiards   The long time algebraic relaxation process in spatially periodic billiards
with infinite horizon is shown to display a self-similar time asymptotic form.
This form is identical for a class of such billiards, but can be different in
an important special case.

11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc