We present the cosmological model of a bouncing universe with causal fluid in the universe. The dissipative effects of the causal cosmic fluid is probed with both truncated Israel–Stewart theory and full Israel–Stewart theory. The following classes of non-vanishing scale factors of bouncing cosmology are considered with a viscous fluid: (i) the power-law bouncing model, (ii) the exponential bouncing model and (iii) the matter bouncing model in the Einstein gravity. The cosmological parameters of the Hubble parameter, deceleration parameter, jerk parameter, energy density and bulk viscous pressure of the universe are determined in the theories to obtain realistic cosmologies. The observational constraints of the parameters of bouncing cosmological models are estimated making use of the observed cosmological data. The physical and geometrical aspects of the cosmological models based on the imposed constraints are also discussed.

我们介绍了一个在宇宙中具有因果流体的弹跳宇宙的宇宙学模型。截断的以色列-斯图尔特理论和完整的以色列-斯图尔特理论都探讨了因果宇宙流体的耗散效应。在粘性流体中考虑了以下类别的弹跳宇宙学的不消失的比例因子：（i）幂律弹跳模型，（ii）指数弹跳模型，以及（iii）爱因斯坦引力中的物质弹跳模型。在理论中确定了宇宙的哈勃参数，减速度参数，加速度率参数，能量密度和体粘性压力的宇宙学参数，以获得现实的宇宙学。利用观测到的宇宙学数据估算弹跳宇宙学模型参数的观测约束。