Dark Energy, Scalar-Tensor Gravity and Large Extra Dimensions

Abstract

We explore in detail a dilatonic scalar-tensor theory of gravity inspired by large extra dimensions, where a radion field from compact extra dimensions gives rise to quintessence in our 4-dimensional world. We show that the model can give rise to other types of cosmologies as well, some more akin to $k$-essence and possibly variants of phantom dark energy. In our model the field (or radius) stabilization arises from quantum corrections to the effective 4D Ricci scalar. We then show that various constraints nearly determine the model parameters, and give an example of a quintessence-type cosmology consistent with observations. We show that the upcoming SNAP-experiment would easily distinguish the present model from a constant $\Lambda$ model with an \emph{equal} amount of dark energy, but that the SNAP-data alone will not be able distinguish it from a $\Lambda$ model with about 5% less dark energy.

Substantially revised version accepted for publication in Phys. Rev. D, 19 pages, 9 figures

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• Tensor-multi-scalar theories: relativistic stars and 3+1 decomposition
• Casimir Energies for 6D Supergravities Compactified on T_2/Z_N with Wilson Lines
• Constraining scalar-tensor theories by neutron star-balck hole gravitational wave events
• Testing Gravity with Gravitational Waves from Binary Black Hole Mergers: Contributions from Amplitude Corrections
• Semi-Analytic Stellar Structure in Scalar-Tensor Gravity
• UV Sensitivity in Supersymmetric Large Extra Dimensions: The Ricci-flat Case
• Tensor-Multi-Scalar Gravity: Equations of Motion to 2.5 post-Newtonian Order
• Model-Independent Comparisons of Pulsar Timings to Scalar-Tensor Gravity
• Constraints on Brans-Dicke gravity from neutron star-black hole merger events using higher harmonics
• Phase structure of the $O(2)$ ghost model with higher-order gradient term
• Constraining scalar-tensor theories from higher harmonics with GW230529