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General second-order scalar-tensor theory and self-tuning

Charmousis, Christos; Copeland, Edmund J.; Saffin, Paul M.; Padilla, Antonio


Christos Charmousis


Starting from the most general scalar-tensor theory with second order field equations in four dimensions, we establish the unique action that will allow for the existence of a consistent self-tuning mechanism on FLRW backgrounds, and show how it can be understood as a combination of just four base Lagrangians with an intriguing geometric structure dependent on the Ricci scalar, the Einstein tensor, the double dual of the Riemann tensor and the Gauss-Bonnet combination. Spacetime curvature can be screened from the net cosmological constant at any given moment because we allow the scalar field to break Poincar\'e invariance on the self-tuning vacua, thereby evading the Weinberg no-go theorem. We show how the four arbitrary functions of the scalar field combine in an elegant way opening up the possibility of obtaining non-trivial cosmological solutions.


Charmousis, C., Copeland, E. J., Saffin, P. M., & Padilla, A. (2012). General second-order scalar-tensor theory and self-tuning. Physical Review Letters, 108(5), Article 051101.

Journal Article Type Article
Acceptance Date Jan 1, 2012
Publication Date Jan 30, 2012
Deposit Date Apr 24, 2017
Publicly Available Date Apr 24, 2017
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 108
Issue 5
Article Number 051101
Public URL
Publisher URL
Additional Information General Second-Order Scalar-Tensor Theory and Self-Tuning.
Christos Charmousis, Edmund J. Copeland, Antonio Padilla, and Paul M. Saffin, Phys. Rev. Lett. 108, 051101.


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