Cosmic Microwave Background Anisotropy Induced by Cosmic Strings on Angular Scales <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>≳</mi><mrow><msup><mrow><mn>15</mn></mrow><mrow><mo>′</mo></mrow></msup></mrow></math></span>

B. Allen; R. R. Caldwell; S. Dodelson; L. Knox; E. P. S. Shellard; A. Stebbins

doi:10.1103/PhysRevLett.79.2624

Cosmic Microwave Background Anisotropy Induced by Cosmic Strings on Angular Scales $≳ 15^{'}$

B. Allen, R. R. Caldwell, S. Dodelson, L. Knox, E. P. S. Shellard, and A. Stebbins

Phys. Rev. Lett. 79, 2624 – Published 6 October 1997

Abstract

We have computed an estimate of the angular power spectrum of the cosmic microwave background induced by cosmic strings on angular scales $≳ 15^{'}$ , 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.

Received 5 May 1997

DOI:https://doi.org/10.1103/PhysRevLett.79.2624

Authors & Affiliations

B. Allen¹, R. R. Caldwell², S. Dodelson³, L. Knox⁴, E. P. S. Shellard⁵, and A. Stebbins³

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