Cosmic Microwave Background Anisotropy Induced by Cosmic Strings on Angular Scales {approx_gt}15{sup {prime} }

Journal Article · Wed Oct 01 00:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.2624· OSTI ID:633988

Allen, B ^[1]; Caldwell, R R ^[2]; Dodelson, S; Stebbins, A ^[3]; Knox, L ^[4]; Shellard, E P ^[5]

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1. Department of Physics, University of Wisconsin---Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201 (United States)
2. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19106 (United States)
3. NASA/Fermilab Astrophysics Center, P.O. Box 500, Batavia, Illinois 60510 (United States)
4. Canadian Institute for Theoretical Astrophysics, Toronto, Ontario, M5S 3H8 (Canada)
5. University of Cambridge, D.A.M.T.P. Silver Street, Cambridge CB3 9EW (United Kingdom)

We have computed an estimate of the angular power spectrum of the cosmic microwave background induced by cosmic strings on angular scales {approx_gt}15{sup {prime}}, using a numerical simulation of a cosmic string network and have decomposed this pattern into scalar, vector, and tensor parts. The anisotropies from vector modes dominate except on very small angular scales, and we find no evidence for strong acoustic oscillations in the scalar anisotropy. The anisotropies generated after recombination are even more important than in adiabatic models. The total anisotropy on small scales is inconsistent with current measurements. The calculation has a number of uncertainties, the largest of which is due to finite temporal range. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 633988
• Journal Information: Physical Review Letters, Vol. 79, Issue 14; Other Information: PBD: Oct 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COSMOLOGY
STRING MODELS
MICROWAVE RADIATION
ANISOTROPY
BACKGROUND RADIATION
SIMULATION
RECOMBINATION
OSCILLATIONS
VECTORS
TENSORS