存在体粘滞时广义全息暗能量的宇宙学及其通过慢滚参数的暴胀动力学
Cosmology of a generalised version of holographic dark energy in presence of bulk viscosity and its inflationary dynamics through slow roll parameters
摘要：
本文报道了一种利用哈勃参数的高阶导数重建暗能量（DE）模型的方案，这是Nojiri-Odintsov全息DE的一个特例[S.野尻和S. D. Odintsov，Gen. Relativ.重力38（2006）1285.]把幻影膨胀和宇宙晚期的加速统一起来。在考虑体粘滞系数的情况下，将体粘滞压力作为哈勃参数的函数进行了重建。导出了状态方程（EoS）参数的本质、宇宙学常数和幻影行为的宇宙时间范围$t$。在粘性的情况下，重建已进行了相互作用和非相互作用的情况下，在这两种情况下，对小扰动的稳定性已被观察到。最后，研究了慢滚参数，观察到了一个脱离暴胀的范围。此外，准指数展开的可用性已被证明为相互作用的粘性场景和研究，通过张量标量比已确保与普朗克的观测边界的模型的一致性。随着原始涨落的相互作用的情况下，已被发现产生强耗散制度。
英文摘要：
The present study reports a reconstruction scheme of a Dark Energy (DE) model with higher order derivative of Hubble parameter, which is a particular case of Nojiri-Odintsov holographic DE [S. Nojiri and S. D. Odintsov, Gen. Relativ. Gravit. 38 (2006) 1285.] that unifies phantom inflation with the acceleration of te universe on late-time. The reconstruction has been carried out in presence of bulk-viscosity, where the bulk-viscous pressure has been taken as a function of Hubble parameter. Ranges of cosmic time $t$ have been derived for quintessence, cosmological constant and phantom behaviour of the equation of state (EoS) parameter. In the viscous scenario, the reconstruction has been carried out in an interacting and non-interacting situations and in both the cases stability against small perturbations has been observed. Finally, the slow roll parameters have been studied and a scope of exit from inflation has been observed. Also, availability of quasi exponential expansion has been demonstrated for interacting viscous scenario and a study through tensor to scalar ratio has ensured consistency of the model with the observational bound by Planck. Alongwith primordial fluctuations the interacting scenario has been found to generate strong dissipative regime.
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