Large Angle CMB Fluctuations from Cosmic Strings with a Comological Constant

Details Large Angle CMB Fluctuations from Cosmic Strings with a Comological Constant Large Angle CMB Fluctuations from Cosmic Strings with a Comological Constant

2003-02-09

arxiv.org/abs/astro-ph/0302166v2

Phys.Rev.D69:023003,2004

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures; replaced with version to appear in Physical Review D

Scientific paper

10.1103/PhysRevD.69.023003

In this paper, we present results for large-angle CMB anisotropies generated from high resolution simulations of cosmic string networks in a range of flat FRW universes with a cosmological constant. Using an ensemble of all-sky maps, we compare with the COBE data to infer a normalization (or upper bound) on the string linear energy density $\mu$. For a flat matter-dominated model ($\Omega_{M}=1$) we find $G\mu/c^2 \approx 0.7\times 10^{-6}$, which is lower than previous constraints probably because of the more accurate inclusion of string small-scale structure. For a cosmological constant within an observationally acceptable range, we find a relatively weak dependence with $G\mu/c^2$ less than 10% higher.

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