• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >Confirmation of general relativity on large scales from weak lensing and galaxy velocities
【24h】

Confirmation of general relativity on large scales from weak lensing and galaxy velocities

机译：弱透镜和星系速度在大尺度上确认广义相对论

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Although general relativity underlies modern cosmology, its applicability on cosmological length scales has yet to be stringently tested. Such a test has recently been proposed, using a quantity, E_G, that combines measures of large-scale gravitational lensing, galaxy clustering and structure growth rate. The combination is insensitive to 'galaxy bias' (the difference between the clustering of visible galaxies and invisible dark matter) and is thus robust to the uncertainty in this parameter. Modified theories of gravity generally predict values of E_G different from the general rela-tivistic prediction because, in these theories, the 'gravitational slip' (the difference between the two potentials that describe perturbations in the gravitational metric) is non-zero, which leads to changes in the growth of structure and the strength of the gravitational lensing effect. Here we report that E_G = 0.39 ± 0.06 on length scales of tens of megaparsecs, in agreement with the general relativistic prediction of E_G≈0.4. The measured value excludes a model within the tensor-vector-scalar gravity theory, which modifies both Newtonian and Einstein gravity. However, the relatively large uncertainty still permits models within f(R) theory, which is an extension of general relativity. A fivefold decrease in uncertainty is needed to rule out these models.
机译：尽管广义相对论是现代宇宙学的基础，但它在宇宙学长度尺度上的适用性尚待严格测试。最近已经提出了一种使用量E_G的测试，该量结合了大规模重力透镜化，星系聚类和结构生长速率的度量。该组合对“星系偏差”（可见星系和不可见暗物质之间的差异）不敏感，因此对于此参数的不确定性具有鲁棒性。修正的引力理论通常预测E_G的值与一般相对论预测不同，因为在这些理论中，“引力滑移”（描述引力度量摄动的两个势之间的差）非零，这导致改变结构的增长和重力透镜作用的强度。在这里，我们报告说，在数十兆秒的长度尺度上，E_G = 0.39±0.06，与E_G≈0.4的相对论性预测相一致。测量值不包括张量-矢量-标量重力理论中的模型，该模型会修改牛顿重力和爱因斯坦重力。但是，相对较大的不确定性仍然允许f（R）理论中的模型，这是广义相对论的扩展。要排除这些模型，需要将不确定性降低五倍。

著录项

  • 来源
    《Nature》 |2010年第7286期|256-258|共3页
  • 作者

    Reinabelle Reyes; Rachel Mandelbaum; Uros Seljak; Tobias Baldauf; James E. Gunn; Lucas Lombriser; Robert E. Smith;

  • 作者单位

    Princeton University Observatory, Peyton Hall, Princeton, New Jersey 08544, USA;

    Princeton University Observatory, Peyton Hall, Princeton, New Jersey 08544, USA;

    Institute for Theoretical Physics, University of Zurich, Zurich 8057, Switzerland Physics and Astronomy Department and Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA Institute for Early Universe, Ewha University, Seoul 120-750, South Korea;

    Institute for Theoretical Physics, University of Zurich, Zurich 8057, Switzerland;

    Princeton University Observatory, Peyton Hall, Princeton, New Jersey 08544, USA;

    Institute for Theoretical Physics, University of Zurich, Zurich 8057, Switzerland;

    Institute for Theoretical Physics, University of Zurich, Zurich 8057, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号