Initial conditions of the universe: how much isocurvature is allowed?
We investigate the constraints imposed by current data on correlated mixtures of adiabatic and nonadiabatic primordial perturbations. We discover subtle flat directions in parameter space that tolerate large (approximately 60%) fractions of nonadiabatic fluctuations. In particular, larger values of...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2004
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| _version_ | 1797067218542919680 |
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| author | Bucher, M Dunkley, J Ferreira, P Moodley, K Skordis, C |
| author_facet | Bucher, M Dunkley, J Ferreira, P Moodley, K Skordis, C |
| author_sort | Bucher, M |
| collection | OXFORD |
| description | We investigate the constraints imposed by current data on correlated mixtures of adiabatic and nonadiabatic primordial perturbations. We discover subtle flat directions in parameter space that tolerate large (approximately 60%) fractions of nonadiabatic fluctuations. In particular, larger values of the baryon density and a spectral tilt are allowed. The cancellations in the degenerate directions are explored and the role of priors is elucidated. |
| first_indexed | 2024-03-06T21:53:14Z |
| format | Journal article |
| id | oxford-uuid:4c08eb99-14be-455d-b7c9-c6b09e49b0d0 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T21:53:14Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:4c08eb99-14be-455d-b7c9-c6b09e49b0d02022-03-26T15:47:04ZInitial conditions of the universe: how much isocurvature is allowed?Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:4c08eb99-14be-455d-b7c9-c6b09e49b0d0EnglishSymplectic Elements at Oxford2004Bucher, MDunkley, JFerreira, PMoodley, KSkordis, CWe investigate the constraints imposed by current data on correlated mixtures of adiabatic and nonadiabatic primordial perturbations. We discover subtle flat directions in parameter space that tolerate large (approximately 60%) fractions of nonadiabatic fluctuations. In particular, larger values of the baryon density and a spectral tilt are allowed. The cancellations in the degenerate directions are explored and the role of priors is elucidated. |
| spellingShingle | Bucher, M Dunkley, J Ferreira, P Moodley, K Skordis, C Initial conditions of the universe: how much isocurvature is allowed? |
| title | Initial conditions of the universe: how much isocurvature is allowed? |
| title_full | Initial conditions of the universe: how much isocurvature is allowed? |
| title_fullStr | Initial conditions of the universe: how much isocurvature is allowed? |
| title_full_unstemmed | Initial conditions of the universe: how much isocurvature is allowed? |
| title_short | Initial conditions of the universe: how much isocurvature is allowed? |
| title_sort | initial conditions of the universe how much isocurvature is allowed |
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