Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dilaton field and cosmic wave propagation   We study the electromagnetic wave propagation in the joint dilaton field and
axion field. Dilaton field induces amplification/attenuation in the propagation
while axion field induces polarization rotation. The amplification/attenuation
induced by dilaton is independent of the frequency (energy) and the
polarization of electromagnetic waves (photons). From observations, the
agreement with and the precise calibration of the cosmic microwave background
(CMB) to blackbody radiation constrains the fractional change of dilaton
|{\Delta}{\psi}|/{\psi} to less than about 8 x 10^(-4) since the time of the
last scattering surface of the CMB.

37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph