Cosmic microwave background bispectrum from active models of structure formation

Mostrar todas las versiones(4)

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...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Gangui, A., Pogosian, L., Winitzki, S.
Formato: JOUR
Materias:
anisotropy
article
astronomy
calculation
methodology
model
physics
signal detection
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_05562821_v64_n4_p_Gangui
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_05562821_v64_n4_p_Gangui
record_format dspace
spelling todo:paper_05562821_v64_n4_p_Gangui2023-10-03T15:35:43Z Cosmic microwave background bispectrum from active models of structure formation Gangui, A. Pogosian, L. Winitzki, S. anisotropy article astronomy calculation methodology model physics signal detection 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. © 2001 The American Physical Society. Fil:Gangui, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_05562821_v64_n4_p_Gangui
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic anisotropy
article
astronomy
calculation
methodology
model
physics
signal detection
spellingShingle anisotropy
article
astronomy
calculation
methodology
model
physics
signal detection
Gangui, A.
Pogosian, L.
Winitzki, S.
Cosmic microwave background bispectrum from active models of structure formation
topic_facet anisotropy
article
astronomy
calculation
methodology
model
physics
signal detection
description 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. © 2001 The American Physical Society.
format JOUR
author Gangui, A.
Pogosian, L.
Winitzki, S.
author_facet Gangui, A.
Pogosian, L.
Winitzki, S.
author_sort Gangui, A.
title Cosmic microwave background bispectrum from active models of structure formation
title_short Cosmic microwave background bispectrum from active models of structure formation
title_full Cosmic microwave background bispectrum from active models of structure formation
title_fullStr Cosmic microwave background bispectrum from active models of structure formation
title_full_unstemmed Cosmic microwave background bispectrum from active models of structure formation
title_sort cosmic microwave background bispectrum from active models of structure formation
url http://hdl.handle.net/20.500.12110/paper_05562821_v64_n4_p_Gangui
work_keys_str_mv AT ganguia cosmicmicrowavebackgroundbispectrumfromactivemodelsofstructureformation
AT pogosianl cosmicmicrowavebackgroundbispectrumfromactivemodelsofstructureformation
AT winitzkis cosmicmicrowavebackgroundbispectrumfromactivemodelsofstructureformation
_version_ 1807321804116590592

Ejemplares similares