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arXiv 1801.08036gr-qc
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三种相互作用流体方法在宇宙学常数问题中的应用

The approach of the three interacting fluids applied to the cosmological constant problem

Mónica Forte

摘要:

我们提出了一个由冷暗物质、真空能量和辐射三种理想流体组成的宇宙学模型,它们之间的相互作用导致了一个由三种自我保存的流体组成的等效模型,该模型可以与$ Λ$ CDM模型和一个暖暗物质组分相一致.有效能量密度表示的整体能量密度,其衍生物和相互作用,与观测数据调整的参数允许显示真空能量的演变。这支持了所谓的宇宙学常数问题的120个数量级的差异,同时支持了早期对其密度参数的严格限制。该模型的最佳拟合参数$ H_0= 74.06 $ km/sMpc和$q_0=-0.78$、$z_{acc}=0.75$与参考文献一致,并且还允许减轻所谓的巧合问题和年龄危机。用状态探测器进行的几何分析表明,由于有效真空能量密度的演化,与$Λ$ CDM模型的差异。

英文摘要:

We present a cosmological model constituted by three perfect fluids, cold dark matter, vacuum energy and radiation, which interacting with each other lead to an equivalent model of three self-preserved fluids that can be identified with the $ Λ$CDM model plus a warm dark matter component. The effective energy densities expressed in terms of the global density of energy, its derivatives and interactions, with parameters adjusted with the observational data allow to show the evolution of the vacuum energy. This supports the difference in 120 orders of magnitude of the so-called problem of the cosmological constant and at the same time the strict limits on its density parameter at early times. The best fits parameters of the model, $ H_0= 74.06 $km/sMpc and $q_0=-0.78$, $z_{acc}=0.75$ are concordant with the bibliography and also allow the so-called problems of coincidence and the crisis of age to be alleviated. A geometric analysis performed with statefinders shows the difference with the $Λ$CDM model because of the evolution of the effective vacuum density of energy.

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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