Bi-galileon theory I: motivation and formulation
We introduce bi-galileon theory, the generalisation of the single galileon model introduced by Nicolis et al. The theory contains two coupled scalar fields and is described by a Lagrangian that is invariant under Galilean shifts in those fields. This paper is the first of two, and focuses on the mot...
| Main Authors: | , , |
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| Format: | Article |
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Springer
2010
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| Online Access: | https://eprints.nottingham.ac.uk/42133/ |
| _version_ | 1848796427425153024 |
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| author | Padilla, Antonio Saffin, Paul M. Zhou, Shuang-Yong |
| author_facet | Padilla, Antonio Saffin, Paul M. Zhou, Shuang-Yong |
| author_sort | Padilla, Antonio |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | We introduce bi-galileon theory, the generalisation of the single galileon model introduced by Nicolis et al. The theory contains two coupled scalar fields and is described by a Lagrangian that is invariant under Galilean shifts in those fields. This paper is the first of two, and focuses on the motivation and formulation of the theory. We show that the boundary effective theory of the cascading cosmology model corresponds to a bi-galileon theory in the decoupling limit, and argue that this is to be expected for co-dimension 2 braneworld models exhibiting infra-red modification of gravity. We then generalise this, by constructing the most general bi-galileon Lagrangian. By coupling one of the galileons to the energy-momentum tensor, we pitch this as a modified gravity theory in which the modifications to General Relativity are encoded in the dynamics of the two galileons. We initiate a study of phenomenology by looking at maximally symmetric vacua and their stability, developing elegant geometric techniques that trivially explain why some of the vacua have to be unstable in certain cases (eg DGP). A detailed study of phenomenology appears in our companion paper. |
| first_indexed | 2025-11-14T19:47:49Z |
| format | Article |
| id | nottingham-42133 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:47:49Z |
| publishDate | 2010 |
| publisher | Springer |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-421332020-05-04T16:30:11Z https://eprints.nottingham.ac.uk/42133/ Bi-galileon theory I: motivation and formulation Padilla, Antonio Saffin, Paul M. Zhou, Shuang-Yong We introduce bi-galileon theory, the generalisation of the single galileon model introduced by Nicolis et al. The theory contains two coupled scalar fields and is described by a Lagrangian that is invariant under Galilean shifts in those fields. This paper is the first of two, and focuses on the motivation and formulation of the theory. We show that the boundary effective theory of the cascading cosmology model corresponds to a bi-galileon theory in the decoupling limit, and argue that this is to be expected for co-dimension 2 braneworld models exhibiting infra-red modification of gravity. We then generalise this, by constructing the most general bi-galileon Lagrangian. By coupling one of the galileons to the energy-momentum tensor, we pitch this as a modified gravity theory in which the modifications to General Relativity are encoded in the dynamics of the two galileons. We initiate a study of phenomenology by looking at maximally symmetric vacua and their stability, developing elegant geometric techniques that trivially explain why some of the vacua have to be unstable in certain cases (eg DGP). A detailed study of phenomenology appears in our companion paper. Springer 2010-12-06 Article PeerReviewed Padilla, Antonio, Saffin, Paul M. and Zhou, Shuang-Yong (2010) Bi-galileon theory I: motivation and formulation. Journal of High Energy Physics, 2010 (12). 031. ISSN 1029-8479 http://link.springer.com/article/10.1007%2FJHEP12%282010%29031 doi:10.1007/JHEP12(2010)031 doi:10.1007/JHEP12(2010)031 |
| spellingShingle | Padilla, Antonio Saffin, Paul M. Zhou, Shuang-Yong Bi-galileon theory I: motivation and formulation |
| title | Bi-galileon theory I: motivation and formulation |
| title_full | Bi-galileon theory I: motivation and formulation |
| title_fullStr | Bi-galileon theory I: motivation and formulation |
| title_full_unstemmed | Bi-galileon theory I: motivation and formulation |
| title_short | Bi-galileon theory I: motivation and formulation |
| title_sort | bi-galileon theory i: motivation and formulation |
| url | https://eprints.nottingham.ac.uk/42133/ https://eprints.nottingham.ac.uk/42133/ https://eprints.nottingham.ac.uk/42133/ |