Grimm Nastassia, Bonvin Camille, Tutusaus Isaac
Département de Physique Théorique and Center for Astroparticle Physics, <a href="https://ror.org/01swzsf04">Université de Genève</a>, Quai Ernest Ansermet 24, CH-1211 Geneve 4, Switzerland.
<a href="https://ror.org/05hm2ja81">Institut de Recherche en Astrophysique et Planétologie (IRAP)</a>, Université de Toulouse, CNRS, UPS, CNES, 14 Avenue Edouard Belin, 31400 Toulouse, France.
Phys Rev Lett. 2024 Nov 22;133(21):211004. doi: 10.1103/PhysRevLett.133.211004.
We combine measurements of galaxy velocities from galaxy surveys with measurements of the Weyl potential from the Dark Energy Survey to test the consistency of general relativity at cosmological scales. Taking the ratio of two model-independent observables-the growth rate of structure and the Weyl potential-we obtain new measurements of the E_{G} statistic with precision of 6.0-11.3% at four different redshifts. These measurements provide a considerable improvement to past measurements of E_{G}. They confirm the validity of general relativity at four redshifts, with a deviation of at most 1.6σ from the predicted values. Contrary to conventional methods that rely on a common galaxy sample with spectroscopic resolution to measure two types of correlations, we directly combine two observables that are independent of the galaxy bias. This provides a novel approach to testing the relation between the geometry of our Universe and the motion of galaxies with improved precision.
我们将星系巡天中星系速度的测量结果与暗能量巡天中韦尔势的测量结果相结合，以检验广义相对论在宇宙学尺度上的一致性。通过取两个与模型无关的可观测量——结构增长率和韦尔势——的比值，我们在四个不同红移处获得了精度为6.0 - 11.3%的(E_{G})统计量的新测量结果。这些测量结果相较于过去对(E_{G})的测量有了显著改进。它们在四个红移处证实了广义相对论的有效性，与预测值的偏差至多为1.6σ。与依靠具有光谱分辨率的共同星系样本测量两种相关性的传统方法不同，我们直接结合了两个与星系偏差无关的可观测量。这为以更高精度检验我们宇宙的几何结构与星系运动之间的关系提供了一种新方法。
