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arXiv 1803.07533astro-ph.COgr-qchep-ph
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作为重力测试的空透镜

Void Lensing as a Test of Gravity

Tessa Baker, Joseph Clampitt, Bhuvnesh Jain, Mark Trodden

摘要:

我们研究了空隙弱透镜的潜力,以测试偏离广义相对论。我们计算了具有导数耦合的标量场的预期透镜信号,发现它有可能在空洞半径内和空洞半径外提高切向剪切。我们使用SDSS中的发光红色Galerkin追踪的空隙来演示测试这些预测的方法。我们发现,空洞的中心密度参数,从透镜信号推断,可以从它的GR值移动到20%,在一些伽利略重力模型。由于这个参数可以独立地估计使用星系示踪轮廓的空隙,我们的方法提供了一个一致性检查的重力理论。虽然伽利略引力现在不被其他数据集视为宇宙加速的来源,但我们在这里展示的方法可以用来测试更普遍的第五种力效应与即将到来的空透镜数据。

英文摘要:

We investigate the potential of weak lensing by voids to test for deviations from General Relativity. We calculate the expected lensing signal of a scalar field with derivative couplings, finding that it has the potential to boost the tangential shear both within and outside the void radius. We use voids traced by Luminous Red Galaxies in SDSS to demonstrate the methodology of testing these predictions. We find that the void central density parameter, as inferred from the lensing signal, can shift from its GR value by up to 20% in some galileon gravity models. Since this parameter can be estimated independently using the galaxy tracer profiles of voids, our method provides a consistency check of the gravity theory. Although galileon gravity is now disfavoured as a source of cosmic acceleration by other datasets, the methods we demonstrate here can be used to test for more general fifth force effects with upcoming void lensing data.

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