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arXiv 0910.0252astro-ph.COhep-ph
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曲率的阴暗面

The dark side of curvature

G. Barenboim, E. Fernandez-Martinez, O. Mena, L. Verde

摘要:

几何测试,如哈勃参数H(z)和角直径距离d_A(z)的组合,原则上可以以直接的、与模型无关的方式打破暗能量状态方程参数w(z)和空间曲率Ω_k之间的简并性。在实践中,对这些量的限制可以从现实的实验中获得,例如那些由重子声学振荡(BAO)星系巡天结合CMB数据提供的限制,可以解决宇宙之间的混淆暗能量状态方程参数和曲率只有统计和参数化模型内的w(z)。结合H(z)和d_A(z)的测量直到z = 2附近足够高的红移,并采用暗能量状态方程的红移演化参数化是解决w(z)-Omega_k简并度的关键。

英文摘要:

Geometrical tests such as the combination of the Hubble parameter H(z) and the angular diameter distance d_A(z) can, in principle, break the degeneracy between the dark energy equation of state parameter w(z), and the spatial curvature Omega_k in a direct, model-independent way. In practice, constraints on these quantities achievable from realistic experiments, such as those to be provided by Baryon Acoustic Oscillation (BAO) galaxy surveys in combination with CMB data, can resolve the cosmic confusion between the dark energy equation of state parameter and curvature only statistically and within a parameterized model for w(z). Combining measurements of both H(z) and d_A(z) up to sufficiently high redshifts around z = 2 and employing a parameterization of the redshift evolution of the dark energy equation of state are the keys to resolve the w(z)-Omega_k degeneracy.

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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