Depolarization of the cosmic microwave background by a primordial magnetic field and its effect upon temperature anisotropy

We estimate the depolarizing effect of a primordial magnetic field upon the cosmic microwave background radiation due to differential Faraday rotation across the last scattering surface. The degree of linear polarization of the CMB is significantly reduced at frequencies around and below 30 GHz (B*/...

Descripción completa

Detalles Bibliográficos
Autores principales: Harari, Diego Darío, Zaldarriaga, Matias
Publicado: 1997
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v55_n4_p1841_Harari
http://hdl.handle.net/20.500.12110/paper_05562821_v55_n4_p1841_Harari
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_05562821_v55_n4_p1841_Harari
record_format dspace
spelling paper:paper_05562821_v55_n4_p1841_Harari2023-06-08T15:42:20Z Depolarization of the cosmic microwave background by a primordial magnetic field and its effect upon temperature anisotropy Harari, Diego Darío Zaldarriaga, Matias We estimate the depolarizing effect of a primordial magnetic field upon the cosmic microwave background radiation due to differential Faraday rotation across the last scattering surface. The degree of linear polarization of the CMB is significantly reduced at frequencies around and below 30 GHz (B*/10-2 G)1/22, where B* is the value of the primordial field at recombination. The depolarizing mechanism reduces the damping of anisotropies due to photon diffusion on small angular scales. The l≈1000 multipoles of the CMB temperature anisotropy correlation function in a standard cold dark matter cosmology increase by up to 7.5% at frequencies where depolarization is significant. Fil:Harari, D.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Zaldarriaga, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1997 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v55_n4_p1841_Harari http://hdl.handle.net/20.500.12110/paper_05562821_v55_n4_p1841_Harari
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We estimate the depolarizing effect of a primordial magnetic field upon the cosmic microwave background radiation due to differential Faraday rotation across the last scattering surface. The degree of linear polarization of the CMB is significantly reduced at frequencies around and below 30 GHz (B*/10-2 G)1/22, where B* is the value of the primordial field at recombination. The depolarizing mechanism reduces the damping of anisotropies due to photon diffusion on small angular scales. The l≈1000 multipoles of the CMB temperature anisotropy correlation function in a standard cold dark matter cosmology increase by up to 7.5% at frequencies where depolarization is significant.
author Harari, Diego Darío
Zaldarriaga, Matias
spellingShingle Harari, Diego Darío
Zaldarriaga, Matias
Depolarization of the cosmic microwave background by a primordial magnetic field and its effect upon temperature anisotropy
author_facet Harari, Diego Darío
Zaldarriaga, Matias
author_sort Harari, Diego Darío
title Depolarization of the cosmic microwave background by a primordial magnetic field and its effect upon temperature anisotropy
title_short Depolarization of the cosmic microwave background by a primordial magnetic field and its effect upon temperature anisotropy
title_full Depolarization of the cosmic microwave background by a primordial magnetic field and its effect upon temperature anisotropy
title_fullStr Depolarization of the cosmic microwave background by a primordial magnetic field and its effect upon temperature anisotropy
title_full_unstemmed Depolarization of the cosmic microwave background by a primordial magnetic field and its effect upon temperature anisotropy
title_sort depolarization of the cosmic microwave background by a primordial magnetic field and its effect upon temperature anisotropy
publishDate 1997
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v55_n4_p1841_Harari
http://hdl.handle.net/20.500.12110/paper_05562821_v55_n4_p1841_Harari
work_keys_str_mv AT hararidiegodario depolarizationofthecosmicmicrowavebackgroundbyaprimordialmagneticfieldanditseffectupontemperatureanisotropy
AT zaldarriagamatias depolarizationofthecosmicmicrowavebackgroundbyaprimordialmagneticfieldanditseffectupontemperatureanisotropy
_version_ 1768546119044825088

Ejemplares similares