Constraining Isocurvature Initial Conditions with WMAP 3-year data
We present constraints on the presence of isocurvature modes from the temperature and polarization CMB spectrum data from the WMAP satellite alone, and in combination with other datasets including SDSS galaxy survey and SNLS supernovae. We find that the inclusion of polarization data allows the WMAP...
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| Format: | Journal article |
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2006
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| _version_ | 1797050205146710016 |
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| author | Bean, R Dunkley, J Pierpaoli, E |
| author_facet | Bean, R Dunkley, J Pierpaoli, E |
| author_sort | Bean, R |
| collection | OXFORD |
| description | We present constraints on the presence of isocurvature modes from the temperature and polarization CMB spectrum data from the WMAP satellite alone, and in combination with other datasets including SDSS galaxy survey and SNLS supernovae. We find that the inclusion of polarization data allows the WMAP data alone, as well as in combination with complementary observations, to place improved limits on the contribution of CDM and neutrino density isocurvature components individually. With general correlations, the upper limits on these sub-dominant isocurvature components are reduced to ~60% of the first year WMAP results, with specific limits depending on the type of fluctuations. If multiple isocurvature components are allowed, however, we find that the data still allow a majority of the initial power to come from isocurvature modes. As well as providing general constraints we also consider their interpretation in light of specific theoretical models like the curvaton and double inflation. |
| first_indexed | 2024-03-06T18:01:43Z |
| format | Journal article |
| id | oxford-uuid:00029fff-53ac-444c-bfde-963ed4e44a5e |
| institution | University of Oxford |
| last_indexed | 2024-03-06T18:01:43Z |
| publishDate | 2006 |
| record_format | dspace |
| spelling | oxford-uuid:00029fff-53ac-444c-bfde-963ed4e44a5e2022-03-26T08:27:09ZConstraining Isocurvature Initial Conditions with WMAP 3-year dataJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:00029fff-53ac-444c-bfde-963ed4e44a5eSymplectic Elements at Oxford2006Bean, RDunkley, JPierpaoli, EWe present constraints on the presence of isocurvature modes from the temperature and polarization CMB spectrum data from the WMAP satellite alone, and in combination with other datasets including SDSS galaxy survey and SNLS supernovae. We find that the inclusion of polarization data allows the WMAP data alone, as well as in combination with complementary observations, to place improved limits on the contribution of CDM and neutrino density isocurvature components individually. With general correlations, the upper limits on these sub-dominant isocurvature components are reduced to ~60% of the first year WMAP results, with specific limits depending on the type of fluctuations. If multiple isocurvature components are allowed, however, we find that the data still allow a majority of the initial power to come from isocurvature modes. As well as providing general constraints we also consider their interpretation in light of specific theoretical models like the curvaton and double inflation. |
| spellingShingle | Bean, R Dunkley, J Pierpaoli, E Constraining Isocurvature Initial Conditions with WMAP 3-year data |
| title | Constraining Isocurvature Initial Conditions with WMAP 3-year data |
| title_full | Constraining Isocurvature Initial Conditions with WMAP 3-year data |
| title_fullStr | Constraining Isocurvature Initial Conditions with WMAP 3-year data |
| title_full_unstemmed | Constraining Isocurvature Initial Conditions with WMAP 3-year data |
| title_short | Constraining Isocurvature Initial Conditions with WMAP 3-year data |
| title_sort | constraining isocurvature initial conditions with wmap 3 year data |
| work_keys_str_mv | AT beanr constrainingisocurvatureinitialconditionswithwmap3yeardata AT dunkleyj constrainingisocurvatureinitialconditionswithwmap3yeardata AT pierpaolie constrainingisocurvatureinitialconditionswithwmap3yeardata |