Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lightlike p-Branes: Mass "Inflation" and Lightlike Braneworlds   Lagrangian description of lightlike p-branes is presented in two equivalent
forms - a Polyakov-type formulation and a dual to it Nambu-Goto-type
formulation. Next, the properties of lightlike brane dynamics in generic
gravitational backgrounds of spherically symmetric and axially symmetric type
are discussed in some detail: "horizon straddling" and "mass inflation" effects
for codimension-one lightlike branes and ground state behavior of
codimension-two lightlike "braneworlds".

36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ