Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dilatonic tachyon in Kerr-de Sitter space   We study the dynamical behavior of the dilaton in the background of
three-dimensional Kerr-de Sitter space which is inspired from the low-energy
string effective action. The Kerr-de Sitter space describes the gravitational
background of a point particle whose mass and spin are given by $1-M$ and $J$
and its curvature radius is given by $\ell$. In order to study the propagation
of metric, dilaton, and Kalb-Ramond two-form, we perform the perturbation
analysis in the southern diamond of Kerr-de Sitter space including a conical
singularity. It reveals a mixing between the dilaton and other unphysical
fields. Introducing a gauge-fixing, we can disentangle this mixing completely
and obtain one decoupled dilaton equation. However it turns out to be a tachyon
with $m^2=-8/\ell^2$. We compute the absorption cross section for the dilatonic
tachyon to extract information on the cosmological horizon of Kerr-de Sitter
space. It is found that there is no absorption of the dilatonic tachyon in the
presence of the cosmological horizon of Kerr-de Sitter space.

1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat