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Salvaging 1/R gravity models
It has been suggested that a 1/R addition to the gravitational Lagrangian could be the source of the observed late-time cosmological acceleration. By itself this term is ruled out by constraints on scalar-tensor gravity, but the addition of extra contributions of the form R^p makes it possible to ev...
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| Lenguaje: | eng |
| Publicado: |
2003
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| Acceso en línea: | http://cds.cern.ch/record/630211 |
| Sumario: | It has been suggested that a 1/R addition to the gravitational Lagrangian could be the source of the observed late-time cosmological acceleration. By itself this term is ruled out by constraints on scalar-tensor gravity, but the addition of extra contributions of the form R^p makes it possible to evade these constraints. We discuss the general conditions for such theories to be viable, and identify the least unnatural candidates. |
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