Cosmic microwave background bispectrum from active models of structure formation

2001/01/31 by Alejandro Gangui, Levon Pogosian, Serge Winitzki · 3 citations
Physics and Astronomy · #Anisotropy #Astronomy #Astrophysics #Bispectrum #COSMIC cancer database #Computer science #Cosmic microwave background #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #Microwave #Optics #Physics #Spectral density #Telecommunications #astro-ph #gr-qc #hep-ph

paper · pdf · doi:10.1103/physrevd.64.043001

published as Phys.Rev. D64 (2001) 043001 · 7 pages, 1 figure. Substantially expanded and revised version accepted for publication in Phys. Rev. D

arxiv created 2001/05/13 · openalex publication_date 2001/07/18 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We propose a method for a numerical computation of the angular bispectrum of the cosmic microwave background (CMB) anisotropies arising from active models such as cosmic topological defects, using a modified Boltzmann code based on CMBFAST. The method does not use CMB sky maps and requires moderate computational power. As a first implementation, we apply our method to a recently proposed model of simulated cosmic strings and estimate the observability of the non-Gaussian bispectrum signal. A comparison with the cosmic variance of the bispectrum estimator shows that the bispectrum for the simulated string model we used is not observable.

Citations

• Cosmic Microwave Background and Density Fluctuations from Strings plus Inflation
• The Case against Scaling Defect Models of Cosmic Structure Formation
• Detailed study of defect models for cosmic structure formation
• Structure of Doppler peaks induced by active perturbations
• A flat Universe from high-resolution maps of the cosmic microwave background radiation

Cited by

• Bounds on cosmic strings from WMAP and SDSS
• Cosmic Strings and Their Induced Non‐Gaussianities in the Cosmic Microwave Background
• Seeking string theory in the cosmos