The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields

We evaluate the angular bispectrum of the CMB temperature anisotropy at large angular scale due to a stochastic background of primordial magnetic fields. The shape of non-Gaussianity depends on the spectral index of the magnetic field power spectrum and is peaked in the squeezed configuration for a...

Descripción completa

Detalles Bibliográficos
Autores principales: Caprini, Chiara, Finelli, Fabio, Paoletti, Daniela, Riotto, Antonio
Lenguaje:eng
Publicado: 2009
Materias:
Astrophysics and Astronomy
Acceso en línea:https://dx.doi.org/10.1088/1475-7516/2009/06/021
http://cds.cern.ch/record/1165889
_version_ 1780916017218715648
author Caprini, Chiara
Finelli, Fabio
Paoletti, Daniela
Riotto, Antonio
author_facet Caprini, Chiara
Finelli, Fabio
Paoletti, Daniela
Riotto, Antonio
author_sort Caprini, Chiara
collection CERN
description We evaluate the angular bispectrum of the CMB temperature anisotropy at large angular scale due to a stochastic background of primordial magnetic fields. The shape of non-Gaussianity depends on the spectral index of the magnetic field power spectrum and is peaked in the squeezed configuration for a scale-invariant magnetic spectrum. By using the large angular part of the bispectrum generated by magnetic fields, the present bounds on non-Gaussianity set a limit on the amplitude of the primordial magnetic field of the order of 10 nGauss for the scale-invariant case and 20 nGauss for the other spectral indexes.
id cern-1165889
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2009
record_format invenio
spelling cern-11658892019-09-30T06:29:59Zdoi:10.1088/1475-7516/2009/06/021http://cds.cern.ch/record/1165889engCaprini, ChiaraFinelli, FabioPaoletti, DanielaRiotto, AntonioThe cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fieldsAstrophysics and AstronomyWe evaluate the angular bispectrum of the CMB temperature anisotropy at large angular scale due to a stochastic background of primordial magnetic fields. The shape of non-Gaussianity depends on the spectral index of the magnetic field power spectrum and is peaked in the squeezed configuration for a scale-invariant magnetic spectrum. By using the large angular part of the bispectrum generated by magnetic fields, the present bounds on non-Gaussianity set a limit on the amplitude of the primordial magnetic field of the order of 10 nGauss for the scale-invariant case and 20 nGauss for the other spectral indexes.arXiv:0903.1420oai:cds.cern.ch:11658892009-03-10
spellingShingle Astrophysics and Astronomy
Caprini, Chiara
Finelli, Fabio
Paoletti, Daniela
Riotto, Antonio
The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields
title The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields
title_full The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields
title_fullStr The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields
title_full_unstemmed The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields
title_short The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields
title_sort cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields
topic Astrophysics and Astronomy
url https://dx.doi.org/10.1088/1475-7516/2009/06/021
http://cds.cern.ch/record/1165889
work_keys_str_mv AT caprinichiara thecosmicmicrowavebackgroundtemperaturebispectrumfromscalarperturbationsinducedbyprimordialmagneticfields
AT finellifabio thecosmicmicrowavebackgroundtemperaturebispectrumfromscalarperturbationsinducedbyprimordialmagneticfields
AT paolettidaniela thecosmicmicrowavebackgroundtemperaturebispectrumfromscalarperturbationsinducedbyprimordialmagneticfields
AT riottoantonio thecosmicmicrowavebackgroundtemperaturebispectrumfromscalarperturbationsinducedbyprimordialmagneticfields
AT caprinichiara cosmicmicrowavebackgroundtemperaturebispectrumfromscalarperturbationsinducedbyprimordialmagneticfields
AT finellifabio cosmicmicrowavebackgroundtemperaturebispectrumfromscalarperturbationsinducedbyprimordialmagneticfields
AT paolettidaniela cosmicmicrowavebackgroundtemperaturebispectrumfromscalarperturbationsinducedbyprimordialmagneticfields
AT riottoantonio cosmicmicrowavebackgroundtemperaturebispectrumfromscalarperturbationsinducedbyprimordialmagneticfields

Ejemplares similares