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arXiv 1606.04097gr-qcastro-ph.CO
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引力影响的粒子产生模型和晚期宇宙加速

Gravitationally influenced particle creation models and late-time cosmic acceleration

Supriya Pan, Barun Kumar Pal, Souvik Pramanik

摘要:

在这项工作中,我们专注于引力影响的绝热粒子的创建过程,一个机制,不需要任何暗能量或修改的引力模型来解释当前的加速阶段的宇宙。介绍了一些粒子产生模型,概括了一些以前的模型在文献中,我们约束的宇宙学的情况下使用的最新汇编的Ia型超新星的数据,加速宇宙的第一个指标。除了对模型的观测约束,我们使用两个模型独立的诊断,即宇宙学和$Om$检查模型。此外,我们建立了一般条件来测试任何粒子产生模型的热力学可行性。我们的分析表明,在后期,这些模型与$Λ$ CDM宇宙学的模型非常相似,并且在一定条件下,这些模型总是满足广义热力学第二定律。

英文摘要:

In this work we focus on the gravitationally influenced adiabatic particle creation process, a mechanism that does not need any dark energy or modified gravity models to explain the current accelerating phase of the universe. Introducing some particle creation models that generalize some previous models in the literature, we constrain the cosmological scenarios using the latest compilation of the Type Ia Supernovae data only, the first indicator of the accelerating universe. Aside from the observational constraints on the models, we examine the models using two model independent diagnoses, namely the cosmography and $Om$. Further, we establish the general conditions to test the thermodynamic viabilities of any particle creation model. Our analysis shows that at late-time, the models have close resemblance to that of the $Λ$CDM cosmology, and the models always satisfy the generalized second law of thermodynamics under certain conditions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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