Noether Identities and Gauge-Fixing the Action for Cosmological Perturbations
We propose and develop a general algorithm for finding the action for cosmological perturbations which rivals the conventional, gauge-invariant approach and can be applied to theories with more than one metric. We then apply it to a particular case of bigravity, focusing on the Eddington- inspired B...
| Main Authors: | , , , |
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| Formato: | Journal article |
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2013
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| _version_ | 1826261117402349568 |
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| author | Lagos, M Bañados, M Ferreira, P García-Sáenz, S |
| author_facet | Lagos, M Bañados, M Ferreira, P García-Sáenz, S |
| author_sort | Lagos, M |
| collection | OXFORD |
| description | We propose and develop a general algorithm for finding the action for cosmological perturbations which rivals the conventional, gauge-invariant approach and can be applied to theories with more than one metric. We then apply it to a particular case of bigravity, focusing on the Eddington- inspired Born-Infeld theory, and show that we can obtain a nearly scale-invariant power spectrum for both scalar and tensor primordial quantum perturbations. Unfortunately, in the case of the minimal Eddington-inspired Born-Infeld theory, we find that the tensor-to-scalar ratio of perturbations is unacceptably large. We discuss the applicability of our general method and the possibility of resurrecting the specific theory we have looked at. |
| first_indexed | 2024-03-06T19:16:32Z |
| format | Journal article |
| id | oxford-uuid:18946cc8-c91f-4b99-8d94-b01c3b5d3cc9 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T19:16:32Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | oxford-uuid:18946cc8-c91f-4b99-8d94-b01c3b5d3cc92022-03-26T10:43:58ZNoether Identities and Gauge-Fixing the Action for Cosmological PerturbationsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:18946cc8-c91f-4b99-8d94-b01c3b5d3cc9Symplectic Elements at Oxford2013Lagos, MBañados, MFerreira, PGarcía-Sáenz, SWe propose and develop a general algorithm for finding the action for cosmological perturbations which rivals the conventional, gauge-invariant approach and can be applied to theories with more than one metric. We then apply it to a particular case of bigravity, focusing on the Eddington- inspired Born-Infeld theory, and show that we can obtain a nearly scale-invariant power spectrum for both scalar and tensor primordial quantum perturbations. Unfortunately, in the case of the minimal Eddington-inspired Born-Infeld theory, we find that the tensor-to-scalar ratio of perturbations is unacceptably large. We discuss the applicability of our general method and the possibility of resurrecting the specific theory we have looked at. |
| spellingShingle | Lagos, M Bañados, M Ferreira, P García-Sáenz, S Noether Identities and Gauge-Fixing the Action for Cosmological Perturbations |
| title | Noether Identities and Gauge-Fixing the Action for Cosmological
Perturbations |
| title_full | Noether Identities and Gauge-Fixing the Action for Cosmological
Perturbations |
| title_fullStr | Noether Identities and Gauge-Fixing the Action for Cosmological
Perturbations |
| title_full_unstemmed | Noether Identities and Gauge-Fixing the Action for Cosmological
Perturbations |
| title_short | Noether Identities and Gauge-Fixing the Action for Cosmological
Perturbations |
| title_sort | noether identities and gauge fixing the action for cosmological perturbations |
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