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arXiv 1707.09354astro-ph.COhep-ph
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来自红移空间畸变的中微子质量和暗能量约束

Neutrino mass and dark energy constraints from redshift-space distortions

Amol Upadhye

摘要:

在不久的将来,宇宙学有望测量中微子质量的总和,这是标准模型的一个基本参数,同时对暗能量的约束也将得到实质性的改进。我们利用BOSS红移空间星系功率谱的形状,结合CMB和超新星数据,来约束中微子质量和暗能量。这个计算的关键是非线性宇宙学扰动理论的几个最新进展,包括FFT方法,红移空间扭曲和尺度相关的增长。当暗能量状态方程及其一阶导数也允许变化时,我们的95%置信度上限180 meV的质量总和大幅下降至540 meV,这对当前的约束提出了重大挑战。我们还研究了额外的星系偏置参数的影响,发现更大的允许范围内的尺度依赖性偏置只有轻微的移动首选中微子质量值,削弱其上限约20%,并有一个可以忽略不计的其他宇宙学参数的影响。

英文摘要:

Cosmology in the near future promises a measurement of the sum of neutrino masses, a fundamental Standard Model parameter, as well as substantially-improved constraints on the dark energy. We use the shape of the BOSS redshift-space galaxy power spectrum, in combination with CMB and supernova data, to constrain the neutrino masses and the dark energy. Essential to this calculation are several recent advances in non-linear cosmological perturbation theory, including FFT methods, redshift space distortions, and scale-dependent growth. Our 95% confidence upper bound of 180 meV on the sum of masses degrades substantially to 540 meV when the dark energy equation of state and its first derivative are also allowed to vary, representing a significant challenge to current constraints. We also study the impact of additional galaxy bias parameters, finding that a greater allowed range of scale-dependent bias only slightly shifts the preferred neutrino mass value, weakens its upper bound by about 20%, and has a negligible effect on the other cosmological parameters.

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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