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Dark matter distribution induced by a cosmic string wake in the nonlinear regime

da Cunha, DCN, Harnois-Déraps, J, Brandenberger, R, Amara, A and Refregier, A (2018) Dark matter distribution induced by a cosmic string wake in the nonlinear regime. Physical Review D, 98 (8). ISSN 2470-0010

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Abstract

We study the distribution of dark matter in the nonlinear regime in a model in which the primordial fluctuations include, in addition to the dominant primordial Gaussian fluctuations generated by the standard ΛCDMcosmological model, the effects of a cosmic string wake set up at the time of equal matter and radiation, making use of cosmological N-body simulations. At early times, the string wake leads to a planar overdensity of dark matter.We study how this non-Gaussian pattern of a cosmic string wake evolves in the presence of the Gaussian perturbations, making use of wavelet and ridgeletlike statistics specifically designed to extract string wake signals. At late times, the Gaussian fluctuations disrupt the string wake.We find that for a string tension ofGμ ¼ 10−7, a value just belowthe current observational limit, the effects of a string wake can be identified in the dark matter distribution, using the current level of the statistical analysis, down to a redshift of z ¼ 10.

Item Type: Article
Additional Information: Disrael Cunha, Joachim Harnois-Deraps, Robert Brandenberger, Adam Amara, Alexandre Refregier, Dark Matter Distribution Induced by a Cosmic String Wake in the Nonlinear Regime. PHYSICAL REVIEW D 98, httpds://dx.doi.org/10.1103/PhysRevD.98.083015
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Physical Society (APS)
Date Deposited: 24 Jul 2020 09:11
Last Modified: 24 Jul 2020 09:15
DOI or Identification number: 10.1103/physrevd.98.083015
URI: http://researchonline.ljmu.ac.uk/id/eprint/13339

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