Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Brane worlds: the gravity of escaping matter   In the framework of a five-dimensional model with one 3-brane and an infinite
extra dimension, we discuss a process in which matter escapes from the brane
and propagates into the bulk to arbitrarily large distances. An example is a
decay of a particle of mass $2m$ residing on the brane into two particles of
mass $m$ that leave the brane and accelerate away. We calculate, in the
linearized theory, the metric induced by these particles on the brane. This
metric does not obey the four-dimensional Einstein equations and corresponds to
a spherical gravity wave propagating along the four-dimensional future light
cone. The four-dimensional space-time left behind the spherical wave is flat,
so the gravitational field induced in the brane world by matter escaping from
the brane disappears in a causal way.

1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph