arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1011.0508astro-ph.COgr-qc
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$f(T)$引力中暗能量的状态方程

Equation of state for dark energy in $f(T)$ gravity

Kazuharu Bamba, Chao-Qiang Geng, Chung-Chi Lee, Ling-Wei Luo

摘要:

研究了暗能量$w_{\mathrm{DE}}$在指数和对数以及它们的组合$f(T)$理论下的宇宙学演化。我们表明,交叉的幻影分界线的$w_{\mathrm{DE}} = -1$可以实现在组合$f(T)$理论,即使它不能在指数或对数$f(T)$理论。特别地,交叉是从$w_{\mathrm{DE}} > -1$到$w_{\mathrm{DE}} < -1$,以与$f(R)$重力模型相反的方式。我们还证明了这一特点是赞成最近的观测数据。

英文摘要:

We study the cosmological evolutions of the equation of state for dark energy $w_{\mathrm{DE}}$ in the exponential and logarithmic as well as their combination $f(T)$ theories. We show that the crossing of the phantom divide line of $w_{\mathrm{DE}} = -1$ can be realized in the combined $f(T)$ theory even though it cannot be in the exponential or logarithmic $f(T)$ theory. In particular, the crossing is from $w_{\mathrm{DE}} > -1$ to $w_{\mathrm{DE}} < -1$, in the opposite manner from $f(R)$ gravity models. We also demonstrate that this feature is favored by the recent observational data.

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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