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

Charmousis, Christos, Copeland, Edmund J., Padilla, Antonio and Saffin, Paul M. (2012) General second-order scalar-tensor theory and self-tuning. Physical Review Letters, 108 (5). 051101/1-051101/. ISSN 1079-7114

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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.

Item Type: Article
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.
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
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Depositing User: Saffin, Dr Paul
Date Deposited: 24 Apr 2017 08:36
Last Modified: 04 May 2020 16:32

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