Asymptotic Cosmological Behavior of Scalar-Torsion Mode in Poincare Gauge Theory

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 $P_T\mathrm{/}{\rho }_T\to 1\mathrm{/}3$ in the high redshift regime $(z \gg 0)$, which is different from the previous result in the literature. We use the Laurent expansion to resolve the solution. We also illustrate our result by the execution of numerical computations.