Dark energy, scalar-tensor gravity, and large extra dimensions

Kimmo Kainulainen and Daniel Sunhede
Phys. Rev. D 73, 083510 – Published 6 April 2006

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 Λ model with an equal amount of dark energy, but that the SNAP-data alone will not be able distinguish it from a Λ model with about 5% less dark energy.

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  • Received 10 October 2005

DOI:https://doi.org/10.1103/PhysRevD.73.083510

©2006 American Physical Society

Authors & Affiliations

Kimmo Kainulainen1,2,* and Daniel Sunhede1,†

  • 1Department of Physics, University of Jyväskylä, P.O. Box 35 (YFL), FIN-40014, Finland
  • 2Department of Physical Sciences and Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FIN-00014, Finland

  • *Electronic address: Kimmo.Kainulainen@phys.jyu.fi
  • Electronic address: Daniel.Sunhede@phys.jyu.fi

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Issue

Vol. 73, Iss. 8 — 15 April 2006

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