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Phys. Rev. D 73, 083510 (2006) [18 pages]

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

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

Received 10 October 2005; published 6 April 2006

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 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.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevD.73.083510
DOI: 10.1103/PhysRevD.73.083510
PACS: 98.80.-k; 04.50.+h; 95.35.+d; 98.80.Cq
  • 98.80.-k
    Cosmology
  • 04.50.+h
    Gravity in more than four dimensions, Kaluza–Klein theory, unified field theories; alternative theories of gravity
  • 95.35.+d
    Dark matter (stellar, interstellar, galactic, and cosmological)
  • 98.80.Cq
    Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.)
  • YEAR: 2006

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