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The Feasibility of Constraining Dark Energy Using LAMOST Redshift Survey

机译：使用LAMOST Redshift调查约束暗能量的可行性

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摘要

We consider using future redshift surveys with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) to constrain the equation of state of dark energy ω. We analyze the Alcock & Paczynski (AP) effect imprinted on the two-point correlation function of galaxies in redshift space. The Fisher matrix analysis is applied to estimate the expected error bounds of ω_0 and ω_a from galaxy redshift surveys, ω_0 and ω_a being the two parameters in the equation of state parametrization ω(z) = ω_0 + ω_az/(1 + z). Strong degeneracies between ω_0 and ω_a are found. The direction of the degeneracy in ω_0 - ω_a plane, however, rotates counter-clockwise as the redshift increases. LAMOST can potentially contribute in the redshift range up to 0.5. In combination with other high redshift surveys, such as the proposed Kilo-Aperture Optical Spectrograph project (KAOS), the joint constraint derived from galaxy surveys at different redshift ranges is likely to efficiently break the degeneracy of ω_0 and ω_a. We do not anticipate that the nature of dark energy can be well constrained with LAMOST alone, but it may help to reduce the error bounds expected from other observations, such as the Supernova/Acceleration Probe (SNAP).
机译：我们考虑将未来的红移测量与大天空区域多目标光纤光谱望远镜（LAMOST）配合使用，以约束暗能量ω的状态方程。我们分析了在红移空间中印在星系两点相关函数上的Alcock＆Paczynski（AP）效应。 Fisher矩阵分析用于从星系红移测量估计ω_0和ω_a的预期误差范围，其中ω_0和ω_a是状态参数化方程ω（z）=ω_0+ω_az/（1 + z）中的两个参数。发现ω_0和ω_a之间的强简并性。然而，随着红移的增加，退化在ω_0-ω_a平面上的方向逆时针旋转。 LAMOST可能在高达0.5的红移范围内起作用。结合其他高红移测量，例如拟议的千焦孔径光学光谱仪项目（KAOS），在不同红移范围内从银河测量获得的联合约束可能有效地破坏ω_0和ω_a的简并性。我们并不认为仅靠LAMOST就能很好地限制暗能量的性质，但它可能有助于减少其他观测结果（如超新星/加速探针（SNAP））所预期的误差范围。

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