Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The lightlike geometry of marginally trapped surfaces in Minkowski
  space-time   The lightlike geometry of codimension two spacelike submanifolds in
Lorentz-Minkowski space has been developed in [Izumiya, S. and Romero Fuster,
M. C. Selecta Mathematica (NS), 13 23--55 (2007)] which is a natural Lorentzian
analogue of the classical Euclidean differential geometry of hypersurfaces. In
this paper we investigate a special class of surfaces (i.e., marginally trapped
surfaces) in Minkowski space-time from the view point of the lightlike
geometry.

35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom