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Cited by 455

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Avoiding Dark Energy with 1/R Modifications of Gravity

Woodard, Richard·2007·Lecture Notes in Physics
DOI 10.1007/978-3-540-71013-4_14
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Abstract

Scalar quintessence seems epicyclic because one can choose the potential to reproduce any cosmology (I review the construction) and because the properties of this scalar seem to raise more questions than they answer. This is why there has been so much recent interest in modified gravity. I review the powerful theorem of Ostrogradski which demonstrates that the only potentially stable, local modification of general relativity is to make the Lagrangian an arbitrary function of the Ricci scalar. Such a theory can certainly reproduce the current phase of cosmic acceleration without Dark Energy. However, this explanation again seems epicyclic in that one can construct a function of the Ricci scalar to support any cosmology (I give the technique). Models of this form are also liable to problems in the way they couple to matter, both in terms of matter’s impact upon them and in terms of the long range gravitational force they predict. Because of these problems my own preference for avoiding Dark Energy is to bypass Ostrogradski’s theorem by considering the fully nonlocal effective action built up by quantum gravitational processes during the epoch of primordial inflation.

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Metadata

Authors
Woodard, R.
Venue
Lecture Notes in Physics
Publisher
Springer Berlin Heidelberg
Published
2007
Pages
403-433
ISSN
0075-8450
DOI
10.1007/978-3-540-71013-4_14
Cited by
455
References
5
Language
en
Licence

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