arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1707.02576astro-ph.CO
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解冻和冻结潜力的限制

Constraints for the thawing and freezing potentials

Tetsuya Hara, Anna Suzuki, Shogo Saka, Takuma Tanigawa

摘要:

本文用经典模型中标量势解冻和冻结引起的状态方程$w(z)$(红移$z$)的时间演化来研究加速的当前宇宙。比例因子为$a = 1$的$dw/da$和$d^2w/da^2$的值与每个电势的两个参数相关联。在固定边界条件$w(z=0)=-1+Δ$下,对五种类型的标量势,数值计算了标量场$t$和$z$随时间的变化.施加观测约束$w_{obs}$(Planck 2015)以检验数值$w(z)$是否在$w_{obs}$内。一些溶液在冻结势中表现出解冻特征。在$dw/da$与$d^2w/da^2$图中得到了互斥的允许区域,以便通过未来的观测试验确定可能的标量势甚至势参数。

英文摘要:

We study the accelerating present universe in terms of the time evolution of the equation of state $w(z)$ (redshift $z$) due to thawing and freezing scalar potentials in the quintessence model. The values of $dw/da$ and $d^2w/da^2$ at scale factor of $a = 1$ are associated with two parameters of each potential. For five type scalar potentials, the scalar fields $Q$ and $w$ as function of time $t$ and/or $z$ are numerically calculated under the fixed boundary condition of $w(z=0)=-1+Δ$. The observational constraint $w_{obs}$ (Planck 2015) is imposed to test whether the numerical $w(z)$ is in $w_{obs}$. Some solutions show the thawing features in the freezing potentials. Mutually exclusive allowed regions in $dw/da$ vs. $d^2w/da^2$ diagram are obtained in order to identify the likely scalar potential and even the potential parameters by future observational tests.

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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