Fastsound: Probing the Origin of Cosmic Acceleration by Galaxy Clustering at z ~ 1.3 with Subaru/fmos
Fastsound: Probing the Origin of Cosmic Acceleration by Galaxy Clustering at z ~ 1.3 with Subaru/fmos
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DOI：
10.5303/pkas.2015.30.2.367
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发表时间：
2015-09
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通讯作者：
T. Totani
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作者：
T. Totani
并首次在此红移范围内探测到了红移空间畸变。红移空间畸变（RSD）信号将被用来测量大尺度结构的增长率，这将为修正艾德引力作为加速宇宙膨胀的可能起源提供一个检验。本文介绍了该项目的概况和研究现状.关键词：宇宙大尺度结构|暗能量引言关于我们目前的宇宙图像，最重要的谜团是宇宙膨胀的加速性质。这是很好地描述了“CDM”模型补充暗物质与排斥ecosmological常数。然而，这有严重的概念问题，因为虽然它与所有当前的观测结果一致（参见Frieman et al. 2008，回顾），但它完全是一个没有基本物理基础的经验模型。代表真空零点能量的自然解释失败了122个数量级，需要一个极端的ne-tuning才能在宇宙的漫长历史中出现。这激发了许多关于“暗能量”或“修正艾德引力”的新物理学的想法，以解释时空的大尺度宇宙动力学（例如，Cald-well & Kamionkowski 2009，for a theoretical review）.星系的大尺度红移巡天现在被广泛认为是解决这一重要和困难的最有力的方法之一。邪教问题这是因为他们能够同时测量暗能量释放（改变膨胀）和重力变化（也影响宇宙结构的生长）。2dFGRS和SDSS等低红移巡天观测已经提供了大量的宇宙学结果，但这些结果与CDM观测结果基本一致，并没有提供新的物理学线索，观测到的红移空间畸变（RSD）是检验宇宙学尺度引力理论的有力工具之一。其核心思想是测量二维聚类的http：//pkas.kas.orggal的跨越和沿着视线。由于这是在“红移空间”中测量的，由于星系落入较大结构的特殊速度，在星系团中会出现各向异性的统计畸变。这种扭曲使我们能够测量下落率，然后与质量涨落进行比较，从而提供了对引力理论的约束检验（例如，汉密尔顿1998年的评论）。要测量的量是增长率f
, and detected the redshift space distortionat this redshift range for the rst time. The redshift space distortion (RSD) signal will be used to derivea measurement of the growth rate of large scale structure, which will provide a test for modi ed gravityas a possible origin of accelerated cosmic explansion. Here we present an overview and the current statusof the project.Key words: large-scale structure of Universe | dark energy1. INTRODUCTIONThe most signi cant mystery concerning our current pic-ture of the Universe is the accelerating nature of the cos-mic expansion. This is well-described by the ‘CDM’model which supplements dark matter with a repulsivecosmological constant. However this has severe concep-tual problems, in that while it is consistent with all cur-rent observations (see Frieman et al. 2008, for a review)it is an entirely empirical model without a fundamentalphysical basis. The natural interpretation of as rep-resenting the zero-point energy of the vacuum fails by122 orders of magnitude and an extreme ne-tuning isrequired for it to appear now in the long history of theuniverse. This has motivated numerous ideas for newphysics of ‘dark energy’ or ‘modi ed gravity’ to explainthe large scale cosmic dynamics of spacetime (e.g., Cald-well & Kamionkowski 2009, for a theoretical review).Large scale redshift surveys of galaxies are now widelyrecognized as one of the most powerful approaches totackle this important and dicult problem. This is be-cause they are able to simultaneously measure the e ectsof dark energy elds (which modify the expansion) andmodi cations of gravity (which also a ect the growth ofstructures in the Universe). Low redshift surveys suchas 2dFGRS and SDSS have delivered a wealth of cosmo-logical results this way but the results remain consistentwith CDM and have, frustratingly, not provided newclues to the underlying physics.The redshift space distortion (RSD) observed ingalaxy redshift survey data is one of powerful tools totest the theory of gravity on cosmological scales. Thecore idea is to measure the two dimensional clustering ofhttp://pkas.kas.orggalaxies both across and along the line-of-sight. Becausethis is measured in ‘redshift space’ an anisotropic sta-tistical distortion arises in galaxy clustering due to thepeculiar velocity of galaxies falling in to larger struc-tures. This distortion allows us to measure the infallrate, and comparison with the mass uctuations thenprovides a constraining test of the theory of gravity (e.g.the review by Hamilton 1998). The quantity that willbe measured is the growth rate f