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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Fab Four: When John and George play gravitation and cosmology
Advances in Astronomy, Volume 2012, Article 430694, Year 2012
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Description
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. © 2012 J.-P. Bruneton et al.
Authors & Co-Authors
Bruneton, Jean Philippe
Belgium, Namur
Namur Institute for Complex Systems
Rinaldi, M.
Belgium, Namur
Namur Institute for Complex Systems
Kanfon, Antonin Danvidé
Benin, Cotonou
University of Abomey-calavi
Hees, A.
Belgium, Namur
Namur Institute for Complex Systems
Belgium, Brussels
Royal Observatory of Belgium
France, Paris
L'observatoire de Paris
Schlögel, S.
Belgium, Namur
Namur Institute for Complex Systems
Füzfa, André
Belgium, Namur
Namur Institute for Complex Systems
Belgium, Louvain-la-neuve
Université Catholique de Louvain
Statistics
Citations: 50
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1155/2012/430694
ISSN:
16877969
e-ISSN:
16877977