Cosmic strings and their induced non-Gaussianities in the cosmic microwave background

Details Cosmic strings and their induced non-Gaussianities in the cosmic microwave background Cosmic strings and their induced non-Gaussianities in the cosmic microwave background

2010-05-26

arxiv.org/abs/1005.4842v2

Advances in Astronomy, vol. 2010, Article ID 380507, 28 pages, 2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

50 pages, 20 figures, uses iopart. Misprints corrected, references added, matches published version

Scientific paper

10.1155/2010/380507

Motivated by the fact that cosmological perturbations of inflationary quantum origin were born Gaussian, the search for non-Gaussianities in the cosmic microwave background (CMB) anisotropies is considered as the privileged probe of non-linear physics in the early universe. Cosmic strings are active sources of gravitational perturbations and incessantly produce non-Gaussian distortions in the CMB. Even if, on the currently observed angular scales, they can only contribute a small fraction of the CMB angular power spectrum, cosmic strings could actually be the main source of its non-Gaussianities. In this article, after having reviewed the basic cosmological properties of a string network, we present the signatures Nambu-Goto cosmic strings would induce in various observables ranging from the one-point function of the temperature anisotropies to the bispectrum and trispectrum. It is shown that string imprints are significantly different than those expected from the primordial type of non-Gaussianity and could therefore be easily distinguished.

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