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arXiv 0906.5366astro-ph.COgr-qchep-phhep-th
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$w \neq -1$是动态暗能量状态方程的证据吗?

Is $w \neq -1$ evidence for a dynamical dark energy equation of state ?

P. P. Avelino, A. M. M. Trindade, P. T. P. Viana

摘要:

目前对暗能量状态方程参数$w$的限制预计在未来十年内将提高一个以上的数量级。如果$|w-1| \gsim 0.01$在当前时间附近,但暗能量动力学足够慢,那么未来的约束可能会排除宇宙学常数,同时与时间无关的状态方程参数一致。在本文中,我们表明,虽然可以构建具有这种行为的模型,但它们确实需要进行重大的微调。因此,如果观测到的宇宙加速是由暗能量成分引起的,那么发现$w \neq -1$本身就构成了动力学暗能量状态方程的有力证据。

英文摘要:

Current constraints on the dark energy equation of state parameter, $w$, are expected to be improved by more than one order of magnitude in the next decade. If $|w-1| \gsim 0.01$ around the present time, but the dark energy dynamics is sufficiently slow, it is possible that future constraints will rule out a cosmological constant while being consistent with a time-independent equation of state parameter. In this paper, we show that although models with such behavior can be constructed, they do require significant fine-tuning. Therefore, if the observed acceleration of the Universe is induced by a dark energy component, then finding $w \neq -1$ would, on its own, constitute very strong evidence for a dynamical dark energy equation of state.

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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