Limits on the gravity wave contribution to microwave anisotropies

Details Limits on the gravity wave contribution to microwave anisotropies Limits on the gravity wave contribution to microwave anisotropies

1999-01-05

arxiv.org/abs/astro-ph/9901028v2

Phys.Rev.D60:123513,1999

Astronomy and Astrophysics

Astrophysics

23 pages, 7 figures, accepted for publication in Phys. Rev. D. Calculations extended to blue spectral index, Fig. 6 added, dis

Scientific paper

10.1103/PhysRevD.60.123513

We present limits on the fraction of large angle microwave anisotropies which could come from tensor perturbations. We use the COBE results as well as smaller scale CMB observations, measurements of galaxy correlations, abundances of galaxy clusters, and Lyman alpha absorption cloud statistics. Our aim is to provide conservative limits on the tensor-to-scalar ratio for standard inflationary models. For power-law inflation, for example, we find T/S<0.52 at 95% confidence, with a similar constraint for phi^p potentials. However, for models with tensor amplitude unrelated to the scalar spectral index it is still currently possible to have T/S>1.

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