Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitational waves in magnetized relativistic plasmas   We study the propagation of gravitational waves (GW) in a uniformly
magnetized plasma at arbitrary angles to the magnetic field. No a priori
assumptions are made about the temperature, and we consider both a plasma at
rest and a plasma flowing out at ultra-relativistic velocities. In the 3+1
orthonormal tetrad description, we find that all three fundamental
low-frequency plasma wave modes are excited by the GW. Alfven waves are excited
by a x polarized GW, whereas the slow and fast magneto-acoustic modes couple to
the + polarization. The slow mode, however, doesn't interact coherently with
the GW. The most relevant wave mode is the fast magneto-acoustic mode which in
a strongly magnetized plasma has a vanishingly small phase lag with respect to
the GW allowing for coherent interaction over large length scales. When the
background magnetic field is almost, but not entirely, parallel to the GW's
direction of propagation even the Alfven waves grow to first order in the GW
amplitude. Finally, we calculate the growth of the magneto-acoustic waves and
the damping of the GW.

31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph