Torsion cosmology and the accelerating universe

Kun-Feng Shie, James M. Nester, and Hwei-Jang Yo
Phys. Rev. D 78, 023522 – Published 18 July 2008

Abstract

Investigations of the dynamic modes of the Poincaré gauge theory of gravity found only two good propagating torsion modes; they are effectively a scalar and a pseudoscalar. Cosmology affords a natural situation where one might see observational effects of these modes. Here, we consider only the “scalar torsion” mode. This mode has certain distinctive and interesting qualities. In particular, this type of torsion does not interact directly with any known matter, and it allows a critical nonzero value for the affine scalar curvature. Via numerical evolution of the coupled nonlinear equations we show that this mode can contribute an oscillating aspect to the expansion rate of the Universe. From the examination of specific cases of the parameters and initial conditions we show that for suitable ranges of the parameters the dynamic “scalar torsion” model can display features similar to those of the presently observed accelerating universe.

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  • Received 15 September 2007

DOI:https://doi.org/10.1103/PhysRevD.78.023522

©2008 American Physical Society

Authors & Affiliations

Kun-Feng Shie1, James M. Nester1,2,3,*, and Hwei-Jang Yo4,†

  • 1Department of Physics, National Central University, Chungli 320, Taiwan
  • 2Graduate Institute of Astronomy, National Central University, Chungli 320, Taiwan
  • 3Center for Mathematics and Theoretical Physics, National Central University, Chungli 320, Taiwan
  • 4Department of Physics, National Cheng-Kung University, Tainan 701, Taiwan

  • *nester@phy.ncu.edu.tw
  • hjyo@phys.ncku.edu.tw

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Issue

Vol. 78, Iss. 2 — 15 July 2008

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