Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the road to discovery of relic gravitational waves: The TE and BB
  Correlations in the cosmic microwave background radiation   The detection of primordial gravitational waves is one of the biggest
challenges of the present time. The existing (Wilkinson Microwave Anisotropy
Probe) observations are helpful on the road to this goal, and the forthcoming
experiments (Planck) are likely to complete this mission. We show that the
5-year Wilkinson Microwave Anisotropy Probe $TE$ data contains a hint of the
presence of gravitational wave contribution. In terms of the parameter $R$,
which gives the ratio of contributions from gravitational waves and density
perturbations to the temperature quadrupole, the best-fit model produced
$R=0.24$. Because of large residual noises, the uncertainty of this
determination is still large, and it easily includes the R=0 hypothesis.
However, the uncertainty will be strongly reduced in the forthcoming
observations which are more sensitive. We numerically simulated the Planck data
and concluded that the relic gravitational waves with $R=0.24$ will be present
at a better than 3$\sigma$ level in the $TE$ observational channel, and at a
better than 2$\sigma$ level in the `realistic' $BB$ channel. The balloon-borne
and ground-based observations may provide a healthy competition to Planck in
some parts of the lower-$\ell$ spectrum.

22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga