TY - JOUR
T1 - Torsion cosmology and the accelerating universe
AU - Shie, Kun Feng
AU - Nester, James M.
AU - Yo, Hwei Jang
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/7/18
Y1 - 2008/7/18
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevD.78.023522
DO - 10.1103/PhysRevD.78.023522
M3 - Article
AN - SCOPUS:48349096079
VL - 78
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 1550-7998
IS - 2
M1 - 023522
ER -