Asymptotic cosmological behavior of scalar-torsion mode in Poincaré gauge theory

@article{Geng2013AsymptoticCB,
  title={Asymptotic cosmological behavior of scalar-torsion mode in Poincar{\'e} gauge theory},
  author={Chao-Qiang Geng and Chung-Chi Lee and H-H. Tseng},
  journal={Physical Review D},
  year={2013},
  volume={87},
  pages={027301}
}
We study the cosmological effect of the simple scalar-torsion ($0^+$) mode in Poincar\'{e} gauge theory of gravity. We find that for the non-constant (affine) curvature case, the early evolution of the torsion density $\rho_T$ has a radiation-like asymptotic behavior of $a^{-4}$ with $a$ representing the scale factor, along with the stable point of the torsion pressure ($P_T$) and density ratio $P_T/\rho_T\rightarrow 1/3$ in the high redshift regime $(z \gg 0)$, which is different from the… 
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