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arXiv 1807.07904astro-ph.COgr-qchep-th
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原始真空中产生的暗能量的观测特征:星系巡天的预测

Observational signatures of dark energy produced in an ancestor vacuum: Forecast for galaxy surveys

Daisuke Yamauchi, Hajime Aoki, Satoshi Iso, Da-Shin Lee, Yasuhiro Sekino, Chen-Pin Yeh

摘要:

我们研究了[1]中提出的暗能量模型的观测结果(Aoki等人,Phys.Rev. D97(2018)no.4,043517)。我们假设我们的宇宙是由气泡成核产生的,并考虑超轻标量场的量子涨落。在原始真空(形成气泡的德西特空间)中产生的波动的残余效应被解释为暗能量。它的状态方程参数w(z)有一个特征形式,在未来接近-1,而在过去接近-1/3。我们的模型的一个新的特点是,暗能量有效地增加了哈勃参数的演化中的负空间曲率的大小,虽然它不会改变角直径距离的定义。我们进行Fisher分析,并预测我们的模型从未来的星系调查平方公里阵列和欧几里得的约束。由于暗能量和空间曲率之间的简并性,单独的星系巡天只能确定这些参数的乐观选择,但与其他独立的观测,如CMB相结合,将大大提高确定它们的机会。

英文摘要:

We study observational consequences of the model for dark energy proposed in [1] (Aoki et al., Phys.Rev. D97 (2018) no.4, 043517). We assume our universe has been created by bubble nucleation, and consider quantum fluctuations of an ultralight scalar field. Residual effects of fluctuations generated in an ancestor vacuum (de Sitter space in which the bubble was formed) is interpreted as dark energy. Its equation of state parameter w(z) has a characteristic form, approaching -1 in the future, but -1/3 in the past. A novel feature of our model is that dark energy effectively increases the magnitude of the negative spatial curvature in the evolution of the Hubble parameter, though it does not alter the definition of the angular diameter distance. We perform Fisher analysis and forecast the constraints for our model from future galaxy surveys by Square Kilometre Array and Euclid. Due to degeneracy between dark energy and the spatial curvature, galaxy surveys alone can determine these parameters only for optimistic choices of their values, but combination with other independent observations, such as CMB, will greatly improve the chance of determining them.

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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