Fab Four : When John and George Play Gravitation and Cosmology
Joint Authors
Bruneton, J.-P.
Schlögel, S.
Rinaldi, M.
Füzfa, A.
Kanfon, A.
Hees, A.
Source
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-12-31
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Abstract EN
Scalar-tensor theories of gravitation attract again a great interest since the discovery of the Chameleon mechanism and of the Galileon models.
The former allows reconciling the presence of a scalar field with the constraints from Solar System experiments.
The latter leads to inflationary models that do not need ad hoc potentials.
Further generalizations lead to a tensor-scalar theory, dubbed the “Fab Four,” with only first and second order derivatives of the fields in the equations of motion that self-tune to a vanishing cosmological constant.
This model needs to be confronted with experimental data in order to constrain its large parameter space.
We present some results regarding a subset of this theory named “John,” which corresponds to a nonminimal derivative coupling between the scalar field and the Einstein tensor in the action.
We show that this coupling gives rise to an inflationary model with very unnatural initial conditions.
Thus, we include the term named “George,” namely, a nonminimal, but nonderivative, coupling between the scalar field and Ricci scalar.
We find a more natural inflationary model, and, by performing a post-Newtonian analysis, we derive the set of equations that constrain the parameter space with data from experiments in the Solar System.
American Psychological Association (APA)
Bruneton, J.-P.& Rinaldi, M.& Kanfon, A.& Hees, A.& Schlögel, S.& Füzfa, A.. 2012. Fab Four : When John and George Play Gravitation and Cosmology. Advances in Astronomy،Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-471694
Modern Language Association (MLA)
Bruneton, J.-P.…[et al.]. Fab Four : When John and George Play Gravitation and Cosmology. Advances in Astronomy No. 2012 (2012), pp.1-14.
https://search.emarefa.net/detail/BIM-471694
American Medical Association (AMA)
Bruneton, J.-P.& Rinaldi, M.& Kanfon, A.& Hees, A.& Schlögel, S.& Füzfa, A.. Fab Four : When John and George Play Gravitation and Cosmology. Advances in Astronomy. 2012. Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-471694
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-471694