Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-29
Phys.Rev. D67 (2003) 021501
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures. Replaced with final updated proof version
Scientific paper
10.1103/PhysRevD.67.021501
One of the major predictions of inflation is the existence of a stochastic background of cosmological gravitational waves (GW). These gravitational waves can induce significant temperature anisotropies in the Cosmic Microwave Background (CMB) on the angular scales recently probed by the Archeops experiment. Here, we perform a combined analysis of Archeops together with information from other CMB experiments and/or cosmological datasets, in order to constrain the amplitude of the GW background. We find that, for a scale-invariant GW background, the ratio of tensor/scalar perturbations at the CMB quadrupole is now constrained to be $r \leq 0.43$ at 95% c.l., while the bound on the spectral index of primordial density fluctuations is $n_S=0.97_{-0.12}^{+0.10}$. We discuss the implications for future GW detections through CMB polarization measurements.
Melchiorri Alessandro
Odman Carolina
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