The Scalar, Vector and Tensor Contributions to CMB anisotropies from Cosmic Defects

Details The Scalar, Vector and Tensor Contributions to CMB anisotropies from Cosmic Defects The Scalar, Vector and Tensor Contributions to CMB anisotropies from Cosmic Defects

1997-06-25

arxiv.org/abs/astro-ph/9706250v2

Phys.Rev.D58:023506,1998

Astronomy and Astrophysics

Astrophysics

13 pages, compressed and uuencoded RevTex file and postscript figures. Minor typographical changes

Scientific paper

10.1103/PhysRevD.58.023506

Recent work has emphasised the importance of vector and tensor contributions to the large scale microwave anisotropy fluctuations produced by cosmic defects. In this paper we provide a general discussion of these contributions, and how their magnitude is constrained by the fundamental assumptions of causality, scaling, and statistical isotropy. We discuss an analytic model which illustrates and explains how the ratios of isotropic and anisotropic scalar, vector and tensor microwave anisotropies are determined. This provides a check of the results from large scale numerical simulations, confirming the numerical finding that vector and tensor modes provide substantial contributions to the large angle anisotropies. This leads to a suppression of the scalar normalisation and consequently of the Doppler peaks.

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