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Viscous Ricci dark energy model with matter creation: Exact solution and observational tests
Pramana ( IF 1.9 ) Pub Date : 2020-08-20 , DOI: 10.1007/s12043-020-01996-9
Ajay Kumar , C P Singh

In this paper, the dissipative mechanism (bulk viscosity and matter creation) is introduced to describe the effects of cosmic non-perfect fluid on the Ricci dark energy (RDE) model. We consider matter creation and bulk viscosity as two independent irreversible processes. Assuming suitable forms of the bulk viscous coefficient and matter creation rate, we find the exact solution of the field equations. We carry out fitting analysis on the cosmological parameters in the model by using Type Ia supernovae data, observational Hubble data and baryon acoustic oscillation (BAO) data with cosmic microwave background. We plot the trajectory of cosmological parameters with the best-fit values of model parameters and discuss all possible (deceleration, acceleration and their transitions) evolutions of the model. The current values of deceleration parameter and equation of state parameter are found to be $$q_0=-0.362$$ q 0 = - 0.362 and $$\omega _{\mathrm {eff}}=-0.575$$ ω eff = - 0.575 , respectively. The age of the Universe is found to be $$t_0\simeq 13.397$$ t 0 ≃ 13.397 Gyr, which is very close to the $$\Lambda $$ Λ CDM model. We further discuss the geometrical diagnostic parameters such as statefinder and Om to distinguish the model with $$\Lambda $$ Λ CDM model. Finally, we discuss the behaviour of energy conditions for our model and find that the model satisfies the null energy condition (NEC), weak energy condition (WEC) and dominant energy condition (DEC) while it violates strong energy condition (SEC).

中文翻译:

具有物质产生的粘性 Ricci 暗能量模型:精确解和观测测试

在本文中,引入耗散机制(体积粘度和物质产生)来描述宇宙非完美流体对 Ricci 暗能量(RDE)模型的影响。我们将物质产生和体积粘度视为两个独立的不可逆过程。假设体积粘性系数和物质产生率的适当形式,我们找到了场方程的精确解。我们利用Ia型超新星数据、哈勃观测数据和具有宇宙微波背景的重子声振荡(BAO)数据对模型中的宇宙学参数进行拟合分析。我们用模型参数的最佳拟合值绘制宇宙学参数的轨迹,并讨论模型的所有可能(减速、加速及其转换)演化。发现减速参数和状态方程参数的当前值为$$q_0=-0.362$$ q 0 = - 0.362 和$$\omega _{\mathrm {eff}}=-0.575$$ ω eff = -分别为 0.575 。发现宇宙的年龄为 $$t_0\simeq 13.397$$ t 0 ≃ 13.397 Gyr,非常接近 $$\Lambda $$ Λ CDM 模型。我们进一步讨论了 statefinder 和 Om 等几何诊断参数,以将模型与 $$\Lambda $$ Λ CDM 模型区分开来。最后,我们讨论了我们模型的能量条件的行为,发现该模型满足零能量条件 (NEC)、弱能量条件 (WEC) 和优势能量条件 (DEC),同时违反了强能量条件 (SEC)。发现宇宙的年龄为 $$t_0\simeq 13.397$$ t 0 ≃ 13.397 Gyr,非常接近 $$\Lambda $$ Λ CDM 模型。我们进一步讨论了 statefinder 和 Om 等几何诊断参数,以将模型与 $$\Lambda $$ Λ CDM 模型区分开来。最后,我们讨论了我们模型的能量条件的行为,发现该模型满足零能量条件 (NEC)、弱能量条件 (WEC) 和优势能量条件 (DEC),同时违反了强能量条件 (SEC)。发现宇宙的年龄为 $$t_0\simeq 13.397$$ t 0 ≃ 13.397 Gyr,非常接近 $$\Lambda $$ Λ CDM 模型。我们进一步讨论了 statefinder 和 Om 等几何诊断参数,以将模型与 $$\Lambda $$ Λ CDM 模型区分开来。最后,我们讨论了我们模型的能量条件的行为,发现该模型满足零能量条件 (NEC)、弱能量条件 (WEC) 和优势能量条件 (DEC),同时违反了强能量条件 (SEC)。
更新日期:2020-08-20
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