arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.01749astro-ph.CO
收藏

大质量中微子的扩展暗能量模型的意义

Implications of an extended dark energy model with massive neutrinos

Ravi Kumar Sharma, Kanhaiya Lal Pandey, Subinoy Das

摘要:

最近有报道发现中微子质量参数($Σm_ν$)的下限时,使用ACT和SPTpol数据,但这些界限上的$Σm_ν$仍然较弱,在大多数情况下,在1 $σ$水平左右。在这种情况下,在这项工作中,我们研究的后果,使用一个扩大的四参数动态暗能量状态方程的中微子质量参数以及哈勃和S8紧张局势。四参数暗能量状态方程包含暗能量状态方程的一般非线性单调演化,其中四个参数是状态方程的早期值和当前值、跃迁标度因子和跃迁的锐度。我们报告说,与透镜边缘普朗克+ BAO +万神殿和先验的绝对星等$M_B$和KIDS/Viking $S_8$先验,该模型有利于一个非零值的中微子质量参数最多在$\sim 1 σ$水平($Σm_ν= 0.1847_{-0.165}^{+0.0698}$ eV)。在这种情况下,该模型还将哈勃张力降低到$\sim 2.5 σ$水平,并将S8张力降低到$\sim$ 1.5 $σ$水平。该模型还提供了一个更严格的约束值的暗能量的状态方程在目前的时代$w_0$($w_0 = -0.9901_{-0.0766}^{+0.0561}$)相比,CPL一样的参数化。

英文摘要:

Recently there has been reports of finding a lower bound on the neutrino mass parameter ($Σm_ν$) when using ACT and SPTpol data however these bounds on the $Σm_ν$ are still weaker for most case around at 1 $σ$ level. In this context, here in this work, we study the consequences of using an enlarged four parameter dynamical dark energy equation of state on neutrino mass parameter as well as on the Hubble and S8 tensions. The four parameter dark energy equation of state incorporates a generic non-linear monotonic evolution of the dark energy equation of state, where the four parameters are the early and the present value of the equation of state, the transition scale factor and the sharpness of the transition. We report that with lensing-marginalized Planck + BAO + Pantheon and prior on absolute magnitude $M_B$ and KIDS/Viking $S_8$ prior, the model favours a non-zero value for the neutrino mass parameter at the most at $\sim 1 σ$ level ($Σm_ν= 0.1847_{-0.165}^{+0.0698}$ eV). In this case this model also brings down the Hubble tension to $\sim 2.5 σ$ level and the S8 tension to $\sim$ 1.5 $σ$ level. This model also provide a tighter constraints on the value of the dark energy equation of state at present epoch $w_0$ ($w_0 = -0.9901_{-0.0766}^{+0.0561}$) in comparison to the CPL like parameterization.

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。

↑