论文标题
暗物质粒子生产宇宙学中的结构形成
Structure Formation in Dark Matter Particle Production Cosmology
论文作者
论文摘要
我们研究了一种宇宙学场景，在该场景中，在宇宙的演变过程中可以产生暗物质颗粒。通过将宇宙作为开放热力学系统并使用非平衡热力学，我们研究了重力颗粒产生的机理。在此设置中，我们研究了纽顿扰动制度中宇宙的大规模结构（LSS）形成，并得出了管理暗物质过重演化的方程式。然后，我们从Planck 2018 CMB测量，SNE IA和BAO观察结果以及Riess等人实施了宇宙学数据。 （2019）$ h_0 $的本地测量，以为我们的模型参数提供一些宇宙学的约束。我们看到，我们的方案的最佳情况（$χ_ {\ rm tot}^{2} = 3834.40 $）比基线$λ$ CDM模型（$χ_ {\ rm tot}^{2} = 3838.00 $）在背景级别更适合观察数据。我们还估计了线性扰动的增长因素，并表明我们的模型的最佳情况（$χ_{Fσ_{8}}}^{2} = 39.85 $）明显地适合LSS数据，比$λ$ cdm型号（$ cdm型号（$χ_{fσ_{fσ_{8}}}}^{2} = 45.29 $ 45.29。因此，与标准宇宙学模型相比，我们的模型还可以在线性扰动级别上具有更好的性能。
We investigate a cosmological scenario in which the dark matter particles can be created during the evolution of the Universe. By regarding the Universe as an open thermodynamic system and using non-equilibrium thermodynamics, we examine the mechanism of gravitational particle production. In this setup, we study the large-scale structure (LSS) formation of the Universe in the Newtonian regime of perturbations and derive the equations governing the evolution of the dark matter overdensities. Then, we implement the cosmological data from Planck 2018 CMB measurements, SNe Ia and BAO observations, as well as the Riess et al. (2019) local measurement for $H_0$ to provide some cosmological constraints for the parameters of our model. We see that the best case of our scenario ($χ_{\rm tot}^{2}=3834.40$) fits the observational data better than the baseline $Λ$CDM model ($χ_{\rm tot}^{2} = 3838.00$) at the background level. We moreover estimate the growth factor of linear perturbations and show that the best case of our model ($χ_{fσ_{8}}^{2}=39.85$) fits the LSS data significantly better than the $Λ$CDM model ($χ_{fσ_{8}}^{2}=45.29$). Consequently, our model also makes a better performance at the level of the linear perturbations compared to the standard cosmological model.
