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*/...
| Autores principales: | , , |
|---|---|
| Formato: | JOUR |
| Lenguaje: | English |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_05562821_v55_n4_p1841_Harari |
| Aporte de: |
| id |
todo:paper_05562821_v55_n4_p1841_Harari |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_05562821_v55_n4_p1841_Harari2023-10-03T15:35:34Z Depolarization of the cosmic microwave background by a primordial magnetic field and its effect upon temperature anisotropy Harari, D.D. Hayward, J.D. Zaldarriaga, M. 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. JOUR English info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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) |
| language |
English |
| orig_language_str_mv |
English |
| 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. |
| format |
JOUR |
| author |
Harari, D.D. Hayward, J.D. Zaldarriaga, M. |
| spellingShingle |
Harari, D.D. Hayward, J.D. Zaldarriaga, M. Depolarization of the cosmic microwave background by a primordial magnetic field and its effect upon temperature anisotropy |
| author_facet |
Harari, D.D. Hayward, J.D. Zaldarriaga, M. |
| author_sort |
Harari, D.D. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_05562821_v55_n4_p1841_Harari |
| work_keys_str_mv |
AT hararidd depolarizationofthecosmicmicrowavebackgroundbyaprimordialmagneticfieldanditseffectupontemperatureanisotropy AT haywardjd depolarizationofthecosmicmicrowavebackgroundbyaprimordialmagneticfieldanditseffectupontemperatureanisotropy AT zaldarriagam depolarizationofthecosmicmicrowavebackgroundbyaprimordialmagneticfieldanditseffectupontemperatureanisotropy |
| _version_ |
1807321105014194176 |