The initial conditions of the universe: how much isocurvature is allowed?
We investigate the constraints imposed by the current data on correlated mixtures of adiabatic and non-adiabatic primordial perturbations. We discover subtle flat directions in parameter space that tolerate large (~60%) contributions of non-adiabatic fluctuations. In particular, larger values of the...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Published: |
2004
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| _version_ | 1826297102608629760 |
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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 the current data on correlated mixtures of adiabatic and non-adiabatic primordial perturbations. We discover subtle flat directions in parameter space that tolerate large (~60%) contributions of non-adiabatic 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 elucidated. |
| first_indexed | 2024-03-07T04:26:27Z |
| format | Journal article |
| id | oxford-uuid:cccc1743-cfc4-48c3-987d-3ad509b3a2f2 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T04:26:27Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:cccc1743-cfc4-48c3-987d-3ad509b3a2f22022-03-27T07:24:23ZThe initial conditions of the universe: how much isocurvature is allowed?Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:cccc1743-cfc4-48c3-987d-3ad509b3a2f2Symplectic Elements at Oxford2004Bucher, MDunkley, JFerreira, PMoodley, KSkordis, CWe investigate the constraints imposed by the current data on correlated mixtures of adiabatic and non-adiabatic primordial perturbations. We discover subtle flat directions in parameter space that tolerate large (~60%) contributions of non-adiabatic 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 elucidated. |
| spellingShingle | Bucher, M Dunkley, J Ferreira, P Moodley, K Skordis, C The initial conditions of the universe: how much isocurvature is allowed? |
| title | The initial conditions of the universe: how much isocurvature is allowed? |
| title_full | The initial conditions of the universe: how much isocurvature is allowed? |
| title_fullStr | The initial conditions of the universe: how much isocurvature is allowed? |
| title_full_unstemmed | The initial conditions of the universe: how much isocurvature is allowed? |
| title_short | The 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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