Power Spectra in Global Defect Theories of Cosmic Structure Formation

Details Power Spectra in Global Defect Theories of Cosmic Structure Formation Power Spectra in Global Defect Theories of Cosmic Structure Formation

1997-04-16

arxiv.org/abs/astro-ph/9704165v2

Phys.Rev.Lett.79:1611-1614,1997

Astronomy and Astrophysics

Astrophysics

4 pages, compressed and uuencoded RevTex file and postscript figures

Scientific paper

10.1103/PhysRevLett.79.1611

An efficient technique for computing perturbation power spectra in field ordering theories of cosmic structure formation is introduced, enabling computations to be carried out with unprecedented precision. Large scale simulations are used to measure unequal time correlators of the source stress energy, taking advantage of scaling during matter and radiation domination, and causality, to make optimal use of the available dynamic range. The correlators are then re-expressed in terms of a sum of eigenvector products, a representation which we argue is optimal, enabling the computation of the final power spectra to be performed at high accuracy. Microwave anisotropy and matter perturbation power spectra for global strings, monopoles, textures and non-topological textures are presented and compared with recent observations.

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