Quasi-matter Bounce Cosmology in Light of Planck

We study quasi-matter bounce cosmology in light of Planck cosmic microwave background (CMB) angular anisotropy measurements along with the BICEP2/Keck Array data. propose a new primordial scalar power spectrum by considering linear approximation equation state $w\cong w_0+\kappa(\eta-\eta_0)$ for field contracting phase universe. Using this spectrum, we constrain zeroth-order $w_0= -\,0.00340\pm 0.00044$ and first-order correction $10^{4} \zeta= -1.67^{+1.50}_{-0.83}$ at $1\sigma$ confidence level temperature polarization combination data which $\zeta = 12\kappa/k_*$ pivot scale $k_*$. The spectral index perturbations is determined to be $n_{\rm Bs}=0.9623\pm0.0055$ lies 7$\sigma$ away from scale-invariant spectrum. find dependency s}$ tighter constraint on running compared $\Lambda$CDM+$\alpha_s$ cosmology. $\alpha_{\rm Bs}= \pi \zeta /2 c_{\rm s} -\hspace{.5mm}0.0021 \pm 0.0016$ nonzero $1.3\sigma$ level, whereas $\Lambda$CDM+$\alpha_{\rm it $0.8\sigma$ sound speed density fluctuations crossing time $c_{\rm 0.097^{+0.037}_{-0.023}$, not very small value phase.