Cosmic String Wake Detection using 3D Ridgelet Transformations

Autor:	Laliberte, Samuel, Brandenberger, Robert, da Cunha, Disrael Camargo Neves
Rok vydání:	2018
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory
Druh dokumentu:	Working Paper
Popis:	Three-dimensional ridgelet statistics are used to search for the signals of cosmic string wakes in the distribution of dark matter. We compare N-body simulations of the dark matter distribution in cosmological models with and without a cosmic string wake, assuming that the dominant sources of fluctuations are those predicted in the standard $\Lambda$CDM model. Cosmic string wakes lead to overdense regions with planar topology, and hence three-dimensional ridgelet statistics are a promising analysis tool. The string signal is easier identifiable for larger string tensions and at higher redshift. We find that a wake produced by a string of tension $G\mu = 10^{-7}$ (a value slightly lower than the best current robust upper bound) can be detected at $6 \, \sigma$ confidence level at a cosmological redshift $z = 10$. Comment: 12 pages, 14 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1807.09820 Zobrazit plný text záznamu View this record from Arxiv