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arXiv 1710.02417astro-ph.CO
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全息暗能量:来自不同观测数据集的相互作用的限制

Holographic dark energy: constraints on the interaction from diverse observational data sets

Purba Mukherjee, Ankan Mukherjee, H. K. Jassal, Ananda Dasgupta, Narayan Banerjee

摘要:

本文研究了以哈勃视界为红外截止点的全息暗能量模型。用三种不同的相互作用项重构了暗能量与暗物质的相互作用率。结果表明,相互作用项的耦合参数应随红移而变化,以使膨胀从减速阶段成功过渡到加速阶段。模型参数的约束条件是从马尔可夫链蒙特卡罗(MCMC)分析使用超新星距离模量数据和观测测量的哈勃参数。结果表明,耦合参数随红移增大或随演化等效减小的模型是不成立的。另一方面,耦合参数,增加或缓慢变化的演变,是与观察到的演变情况。一个贝叶斯证据计算已经进行了统计选择的重建模型。虽然这些模型的运动学参数表现良好,但决定物质部门组成部分性质的物理变量根本不现实。我们已经得出结论,空间曲率的存在是必不可少的这种特殊类型的暗能量模型。

英文摘要:

The present work deals with holographic dark energy models with Hubble horizon as the infra-red cut-off. The interaction rate between dark energy and dark matter has been reconstructed with three different choices of the interaction term. It is shown that the coupling parameter of the interaction term should evolve with redshift to allow the successful transition from decelerated to accelerated phase of expansion. Constraints on the model parameters are obtained from Markov Chain Monte Carlo (MCMC) analysis using the supernova distance modulus data and observational measurements of the Hubble parameter. Results show that the model with the coupling parameter increasing with redshift (z) or equivalently decreasing with the evolution, are ruled out. On the other hand, coupling parameters, increasing or slowly varying with the evolution, are consistent with the observed evolution scenario. A Bayesian evidence calculation has been carried out for statistical selection of the reconstructed models. Though the kinematical parameters are well behaved for these models, the physical variables which determine the nature of the components in the matter sector, are not at all realistic. We have concluded that the existence of spatial curvature is essential for this particular type of dark energy models.

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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