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Cosmic Strings and Their Induced Non-Gaussianities in the Cosmic Microwave Background
Author
Source
Issue
Vol. 2010, Issue 2010 (31 Dec. 2010), pp.1-28, 28 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2010-07-18
Country of Publication
Egypt
No. of Pages
28
Main Subjects
Abstract EN
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 nonlinear 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 paper, 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.
American Psychological Association (APA)
Ringeval, Christophe. 2010. Cosmic Strings and Their Induced Non-Gaussianities in the Cosmic Microwave Background. Advances in Astronomy،Vol. 2010, no. 2010, pp.1-28.
https://search.emarefa.net/detail/BIM-467491
Modern Language Association (MLA)
Ringeval, Christophe. Cosmic Strings and Their Induced Non-Gaussianities in the Cosmic Microwave Background. Advances in Astronomy No. 2010 (2010), pp.1-28.
https://search.emarefa.net/detail/BIM-467491
American Medical Association (AMA)
Ringeval, Christophe. Cosmic Strings and Their Induced Non-Gaussianities in the Cosmic Microwave Background. Advances in Astronomy. 2010. Vol. 2010, no. 2010, pp.1-28.
https://search.emarefa.net/detail/BIM-467491
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-467491