论文标题
对相互作用的暗能量的观察约束 - 暗物质(IDM)宇宙学模型
Observational constraints on the interacting dark energy - dark matter (IDM) cosmological models
论文作者
论文摘要
由量子场理论模型或不可逆过程的热力学描述的粒子创造(或歼灭)机制在早期宇宙的演化中起着重要作用,例如在温暖的通货膨胀情况下。遵循类似的方法,基于开放系统的热力学,在目前的工作中,我们研究了多种组分宇宙中相互作用,衰减和粒子产生的后果,分别包含暗能量,暗物质,辐射和普通物质。在此模型中,由于这些组件之间的相互作用以及相应的热力学特性,因此不单独满足不同宇宙成分的保护方程。我们介绍了宇宙的热力学描述,其中考虑了两个新颖的物理方面,粒子数平衡方程和创造压力,从而使宇宙进化方程在热力学上保持一致。为了限制模型的自由参数,采用了几种观察数据集,包括Planck数据集,RIESS 2020,BAO以及万神殿数据。通过对暗物质与深色能量比的缩放ANSATZ,并通过对Planck+Riess 2020数据施加约束,该模型预测了Hubble参数的可接受价值,因此它可以为所谓的Hubble张力问题提供解决方案,最近进行了辩论。
Particle creation (or annihilation) mechanisms, described by either quantum field theoretical models, or by the thermodynamics of irreversible processes, play an important role in the evolution of the early Universe, like, for example, in the warm inflationary scenario. Following a similar approach, based on the thermodynamics of open systems, in the present work we investigate the consequences of the interaction, decay, and particle generation in a many-component Universe, containing dark energy, dark matter, radiation, and ordinary matter, respectively. In this model, due to the interaction between these components, and of the corresponding thermodynamical properties, the conservation equations of different cosmological constituents are not satisfied individually. We introduce a thermodynamic description of the Universe, in which two novel physical aspects, the particle number balance equations, and the creation pressures, are considered, thus making the cosmological evolution equations thermodynamically consistent. To constrain the free parameters of the model several observational data sets are employed, including the Planck data sets, Riess 2020, BAO, as well as Pantheon data. By using a scaling ansatz for the dark matter to dark energy ratio, and by imposing constraints from Planck+Riess 2020 data, this model predicts an acceptable value for the Hubble parameter, and thus it may provide a solution to the so-called Hubble tension problem, much debated recently.