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arXiv 1610.04419astro-ph.COgr-qc
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寻找暗物质与暗能量的相互作用:运动学方法

In search of the dark matter dark energy interaction: a kinematic approach

Ankan Mukherjee, Narayan Banerjee

摘要:

目前的工作涉及到一个运动学的方法来模拟宇宙的后期动力学。这种方法是基于宇宙学加加速度常数的假设,它是尺度因子的三阶时间导数的无量纲表示。对于$Λ$ CDM模型,在整个演化历史中,加加速度参数的值为-1。现在,对加加速度参数值的任何依赖于模型的估计都将指示模型与宇宙学常数的偏差。在目前的工作中,它也已被证明,对于一个恒定的加加速度参数模型,其值的任何偏差从-1将不允许暗物质有一个独立的守恒,从而指示朝向暗物质和暗能量之间的相互作用。统计分析与不同的观测数据集(即观测哈勃参数数据(OHD),Ia型超新星数据(SNe),和重子声学振荡数据(BAO))导致一个很好的约束值的加加速度参数和模型保持在一个非常接近的$Λ$ CDM。相互作用的可能性被认为是更可能在高红移,而不是在目前的时代。

英文摘要:

The present work deals with a kinematic approach to the modelling the late time dynamics of the universe. This approach is based upon the assumption of constant value of cosmological jerk parameter, which is the dimensionless representation of the 3rd order time derivative of the scale factor. For the $Λ$CDM model, the value of jerk parameter is -1 throughout the evolution history. Now any model dependent estimation of the value of the jerk parameter would indicate the deviation of the model from the cosmological constant. In the present work, it has also been shown that for a constant jerk parameter model, any deviation of its value from -1 would not allow the dark matter to have an independent conservation, thus indicating towards an interaction between dark matter and dark energy. Statistical analysis with different observational data sets (namely the observational Hubble parameter data (OHD), the type Ia supernova data (SNe), and the baryon acoustic oscillation data (BAO)) lead to a well constrained values of the jerk parameter and the model remains at a very close proximity of the $Λ$CDM. The possibility of interaction is found to be more likely at high redshift rather than at present epoch.

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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