The Parameterized Post-Friedmann Framework for Theories of Modified Gravity: Concepts, Formalism and Examples
A unified framework for theories of modified gravity will be an essential tool for interpreting the forthcoming deluge of cosmological data. We present such a formalism, the Parameterized Post-Friedmann framework (PPF), which parameterizes the cosmological perturbation theory of a wide variety of mo...
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| Format: | Journal article |
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2012
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| _version_ | 1797068110551842816 |
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| author | Baker, T Ferreira, P Skordis, C |
| author_facet | Baker, T Ferreira, P Skordis, C |
| author_sort | Baker, T |
| collection | OXFORD |
| description | A unified framework for theories of modified gravity will be an essential tool for interpreting the forthcoming deluge of cosmological data. We present such a formalism, the Parameterized Post-Friedmann framework (PPF), which parameterizes the cosmological perturbation theory of a wide variety of modified gravity models. PPF is able to handle spin-0 degrees of freedom from new scalar, vector and tensor fields, meaning that it is not restricted to simple models based solely on cosmological scalar fields. A direct correspondence is maintained between the parameterization and the underlying space of theories, which allows us to build up a `dictionary' of modified gravity theories and their PPF correspondences. In this paper we describe the construction of the parameterization and demonstrate its use through a number of worked examples relevant to the current literature. We indicate how the formalism will be implemented numerically, so that the dictionary of modified gravity can be pitted against forthcoming observations. |
| first_indexed | 2024-03-06T22:05:58Z |
| format | Journal article |
| id | oxford-uuid:502617e4-0576-4540-a494-7719a0bf45ab |
| institution | University of Oxford |
| last_indexed | 2024-03-06T22:05:58Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:502617e4-0576-4540-a494-7719a0bf45ab2022-03-26T16:11:51ZThe Parameterized Post-Friedmann Framework for Theories of Modified Gravity: Concepts, Formalism and ExamplesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:502617e4-0576-4540-a494-7719a0bf45abSymplectic Elements at Oxford2012Baker, TFerreira, PSkordis, CA unified framework for theories of modified gravity will be an essential tool for interpreting the forthcoming deluge of cosmological data. We present such a formalism, the Parameterized Post-Friedmann framework (PPF), which parameterizes the cosmological perturbation theory of a wide variety of modified gravity models. PPF is able to handle spin-0 degrees of freedom from new scalar, vector and tensor fields, meaning that it is not restricted to simple models based solely on cosmological scalar fields. A direct correspondence is maintained between the parameterization and the underlying space of theories, which allows us to build up a `dictionary' of modified gravity theories and their PPF correspondences. In this paper we describe the construction of the parameterization and demonstrate its use through a number of worked examples relevant to the current literature. We indicate how the formalism will be implemented numerically, so that the dictionary of modified gravity can be pitted against forthcoming observations. |
| spellingShingle | Baker, T Ferreira, P Skordis, C The Parameterized Post-Friedmann Framework for Theories of Modified Gravity: Concepts, Formalism and Examples |
| title | The Parameterized Post-Friedmann Framework for Theories of Modified
Gravity: Concepts, Formalism and Examples |
| title_full | The Parameterized Post-Friedmann Framework for Theories of Modified
Gravity: Concepts, Formalism and Examples |
| title_fullStr | The Parameterized Post-Friedmann Framework for Theories of Modified
Gravity: Concepts, Formalism and Examples |
| title_full_unstemmed | The Parameterized Post-Friedmann Framework for Theories of Modified
Gravity: Concepts, Formalism and Examples |
| title_short | The Parameterized Post-Friedmann Framework for Theories of Modified
Gravity: Concepts, Formalism and Examples |
| title_sort | parameterized post friedmann framework for theories of modified gravity concepts formalism and examples |
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