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arXiv 0901.0245astro-ph.CO
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中微子质量、暗能量和前银河系HI的引力透镜

Neutrino Masses, Dark Energy and the Gravitational Lensing of Pregalactic HI

R. Benton Metcalf

摘要:

我们研究的约束条件,下一代射电望远镜可以放置在中微子的质量和数量的物种,通过研究高红移21厘米发射的引力透镜结合广角调查的星系透镜。我们使用简单的再电离的历史和建议的望远镜设计的特点来预测中微子的约束和可探测性阈值。结果表明,引入21 cm透镜后,中微子参数与暗能量参数之间的简并度显著降低。星系和21厘米透镜的结合可以将中微子质量的总和限制在~ 0.04 eV以内,并将种类的数量限制在~ 0.1以内。这是一个改进的因素,2.6的质量和1.3的数量比星系透镜调查单独。这包括边缘化的11个参数的宇宙学模型与两个参数的暗能量状态方程模型。如果暗能量状态方程保持固定在w = p/ρ=-1,则约束提高到~0.03 eV和0.04 eV。这些预测误差主要取决于红移21 cm辐射(假设为25%)和再电离红移(假设为$z=7$)中可以测量的天空部分。我们还发现,质量太小而不能在数据中检测到的中微子仍然会引起测量的暗能量状态方程的显著偏差。

英文摘要:

We study the constraints which the next generation of radio telescopes could place on the mass and number of neutrino species by studying the gravitational lensing of high redshift 21 cm emission in combination with wide-angle surveys of galaxy lensing. We use simple characterizations of reionization history and of proposed telescope designs to forecast the constraints and detectability threshold for neutrinos. It is found that the degeneracy between neutrino parameters and dark energy parameters is significantly reduced by incorporating 21 cm lensing. The combination of galaxy and 21 cm lensing could constrain the sum of the neutrino masses to within ~ 0.04 eV and the number of species to within ~ 0.1. This is an improvement of a factor of 2.6 in mass and 1.3 in number over a galaxy lensing survey alone. This includes marginalizing over an 11 parameter cosmological model with a two parameter model for the dark energy equation of state. If the dark energy equation of state is held fixed at w = p/ρ=-1 the constraints improve to ~0.03 eV and 0.04. These forecasted errors depend critically on the fraction of sky that can be surveyed in redshifted 21 cm emission (25% is assumed here) and the redshift of reionization ($z=7$ is assumed here). It is also found that neutrinos with masses too small to be detected in the data could none the less cause a significant bias in the measured dark energy equation of state.

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