Covariant approach to parametrized cosmological perturbations
We present a covariant formulation for constructing general quadratic actions for cosmological perturbations, invariant under a given set of gauge symmetries for a given field content. This approach allows us to analyse scalar, vector and tensor perturbations at the same time in a straightforward ma...
| Main Authors: | , , |
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| 格式: | Journal article |
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American Physical Society
2017
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| _version_ | 1826300352513703936 |
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| author | Tattersall, O Lagos, M Ferreira, P |
| author_facet | Tattersall, O Lagos, M Ferreira, P |
| author_sort | Tattersall, O |
| collection | OXFORD |
| description | We present a covariant formulation for constructing general quadratic actions for cosmological perturbations, invariant under a given set of gauge symmetries for a given field content. This approach allows us to analyse scalar, vector and tensor perturbations at the same time in a straightforward manner. We apply the procedure to diffeomorphism invariant single-tensor, scalar-tensor and vector-tensor theories and show explicitly the full covariant form of the quadratic actions in such cases, in addition to the actions determining the evolution of vector and tensor perturbations. We also discuss the role of the symmetry of the background in identifying the set of cosmologically relevant free parameters describing these classes of theories, including calculating the relevant free parameters for an axisymmetric Bianchi-I vacuum universe. |
| first_indexed | 2024-03-07T05:15:42Z |
| format | Journal article |
| id | oxford-uuid:dd1b9972-d3d4-4401-9dbb-bc4f3b6f247d |
| institution | University of Oxford |
| last_indexed | 2024-03-07T05:15:42Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:dd1b9972-d3d4-4401-9dbb-bc4f3b6f247d2022-03-27T09:23:11ZCovariant approach to parametrized cosmological perturbationsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:dd1b9972-d3d4-4401-9dbb-bc4f3b6f247dSymplectic Elements at OxfordAmerican Physical Society2017Tattersall, OLagos, MFerreira, PWe present a covariant formulation for constructing general quadratic actions for cosmological perturbations, invariant under a given set of gauge symmetries for a given field content. This approach allows us to analyse scalar, vector and tensor perturbations at the same time in a straightforward manner. We apply the procedure to diffeomorphism invariant single-tensor, scalar-tensor and vector-tensor theories and show explicitly the full covariant form of the quadratic actions in such cases, in addition to the actions determining the evolution of vector and tensor perturbations. We also discuss the role of the symmetry of the background in identifying the set of cosmologically relevant free parameters describing these classes of theories, including calculating the relevant free parameters for an axisymmetric Bianchi-I vacuum universe. |
| spellingShingle | Tattersall, O Lagos, M Ferreira, P Covariant approach to parametrized cosmological perturbations |
| title | Covariant approach to parametrized cosmological perturbations |
| title_full | Covariant approach to parametrized cosmological perturbations |
| title_fullStr | Covariant approach to parametrized cosmological perturbations |
| title_full_unstemmed | Covariant approach to parametrized cosmological perturbations |
| title_short | Covariant approach to parametrized cosmological perturbations |
| title_sort | covariant approach to parametrized cosmological perturbations |
| work_keys_str_mv | AT tattersallo covariantapproachtoparametrizedcosmologicalperturbations AT lagosm covariantapproachtoparametrizedcosmologicalperturbations AT ferreirap covariantapproachtoparametrizedcosmologicalperturbations |