Cosmic microwave background bispectrum from active models of structure formation

Alejandro Gangui, Levon Pogosian, and Serge Winitzki
Phys. Rev. D 64, 043001 – Published 18 July 2001
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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.

  • Received 30 January 2001

DOI:https://doi.org/10.1103/PhysRevD.64.043001

©2001 American Physical Society

Authors & Affiliations

Alejandro Gangui*

  • Instituto de Astronomía y Física del Espacio, Ciudad Universitaria, 1428 Buenos Aires, Argentina
  • Departamento de Física, Universidad de Buenos Aires, Ciudad Universitaria, Pab. 1, 1428 Buenos Aires, Argentina

Levon Pogosian and Serge Winitzki

  • Physics Department, Case Western Reserve University, Cleveland, Ohio 44106-7079

  • *Email address: gangui@iafe.uba.ar
  • Email address: levon@theory6.phys.cwru.edu
  • Email address: winitzki@erebus.phys.cwru.edu

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Vol. 64, Iss. 4 — 15 August 2001

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