Constraints on a Primordial Magnetic Field
We derive an upper limit of $B_0<3.4\times 10^{-9}(\Omega_0h_{50}^2)^{1/2}$ Gauss on the present strength of any primordial homogeneous magnetic field. The microwave background anisotropy created by cosmological magnetic fields is calculated in the most general flat and open anisotropic cosmo...
| Huvudupphovsmän: | , , |
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| Materialtyp: | Journal article |
| Publicerad: |
1997
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| _version_ | 1826275287144333312 |
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| author | Barrow, J Ferreira, P Silk, J |
| author_facet | Barrow, J Ferreira, P Silk, J |
| author_sort | Barrow, J |
| collection | OXFORD |
| description | We derive an upper limit of $B_0<3.4\times 10^{-9}(\Omega_0h_{50}^2)^{1/2}$ Gauss on the present strength of any primordial homogeneous magnetic field. The microwave background anisotropy created by cosmological magnetic fields is calculated in the most general flat and open anisotropic cosmologies containing expansion-rate and 3-curvature anisotropies. Our limit is derived from a statistical analysis of the 4-year Cosmic Background Explorer data for anisotropy patterns characteristic of homogeneous anisotropy averaged over all possible sky orientations with respect to the COBE receiver. The limits we obtain are considerably stronger than those imposed by primordial nucleosynthesis and ensure that other magnetic field effects on the microwave background structure are unobservably small. |
| first_indexed | 2024-03-06T22:56:24Z |
| format | Journal article |
| id | oxford-uuid:608aa837-f8dc-4a9c-a86b-d53e2e4b6a00 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T22:56:24Z |
| publishDate | 1997 |
| record_format | dspace |
| spelling | oxford-uuid:608aa837-f8dc-4a9c-a86b-d53e2e4b6a002022-03-26T17:54:00ZConstraints on a Primordial Magnetic FieldJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:608aa837-f8dc-4a9c-a86b-d53e2e4b6a00Symplectic Elements at Oxford1997Barrow, JFerreira, PSilk, JWe derive an upper limit of $B_0<3.4\times 10^{-9}(\Omega_0h_{50}^2)^{1/2}$ Gauss on the present strength of any primordial homogeneous magnetic field. The microwave background anisotropy created by cosmological magnetic fields is calculated in the most general flat and open anisotropic cosmologies containing expansion-rate and 3-curvature anisotropies. Our limit is derived from a statistical analysis of the 4-year Cosmic Background Explorer data for anisotropy patterns characteristic of homogeneous anisotropy averaged over all possible sky orientations with respect to the COBE receiver. The limits we obtain are considerably stronger than those imposed by primordial nucleosynthesis and ensure that other magnetic field effects on the microwave background structure are unobservably small. |
| spellingShingle | Barrow, J Ferreira, P Silk, J Constraints on a Primordial Magnetic Field |
| title | Constraints on a Primordial Magnetic Field |
| title_full | Constraints on a Primordial Magnetic Field |
| title_fullStr | Constraints on a Primordial Magnetic Field |
| title_full_unstemmed | Constraints on a Primordial Magnetic Field |
| title_short | Constraints on a Primordial Magnetic Field |
| title_sort | constraints on a primordial magnetic field |
| work_keys_str_mv | AT barrowj constraintsonaprimordialmagneticfield AT ferreirap constraintsonaprimordialmagneticfield AT silkj constraintsonaprimordialmagneticfield |