作为宇宙学尺度引力探测器的快速射电暴

Dennis Neumann, Robert Reischke, Steffen Hagstotz, Hendrik Hildebrandt
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引用次数: 0

摘要

我们探索了利用快速射电暴(FRBs)与宇宙剪切力结合产生的色散测量中的相关性来改进引力约束的可能性。具体地说,我们把重点放在霍恩德斯基引力上,从第4阶段宇宙剪切模拟巡天中推断出动辫和普朗克质量运行率,同时推断出由10^4$ FRBs组成的巡天。在推理管道中,我们利用 hi_class 来预测修正引力情景下的线性物质功率谱,同时利用 HMcode(包括反馈机制)来模拟非线性修正。我们的研究结果表明,FRB 在重子反馈和宇宙学参数以及大质量中微子的质量之间存在纠缠不清的退行性。由于这些参数与修正引力参数之间也存在退行性,因此纳入 FRBs 可以增强对霍恩德斯基参数的约束达 40%,尽管它是一个不太重要的测量。此外,我们还将我们的模型应用于当前的FRB数据,并利用$\mathrm{DM}-z$关系的不确定性对引力施加限制。然而,由于当前数据的样本量有限,限制主要受理论先验的影响。尽管如此,我们的研究证明,FRB 将极大地增强有限的宇宙学探测,在提供反馈、宇宙学和引力的替代测试方面发挥关键作用。这项工作中使用的所有代码均可公开获取。
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Fast radio bursts as a probe of gravity on cosmological scales
We explore the potential for improving constraints on gravity by leveraging correlations in the dispersion measure derived from Fast Radio Bursts (FRBs) in combination with cosmic shear. Specifically, we focus on Horndeski gravity, inferring the kinetic braiding and Planck mass run rate from a stage-4 cosmic shear mock survey alongside a survey comprising $10^4$ FRBs. For the inference pipeline, we utilise hi_class to predict the linear matter power spectrum in modified gravity scenarios, while non-linear corrections are modelled with HMcode, including feedback mechanisms. Our findings indicate that FRBs can disentangle degeneracies between baryonic feedback and cosmological parameters, as well as the mass of massive neutrinos. Since these parameters are also degenerate with modified gravity parameters, the inclusion of FRBs can enhance constraints on Horndeski parameters by up to $40$ percent, despite being a less significant measurement. Additionally, we apply our model to current FRB data and use the uncertainty in the $\mathrm{DM}-z$ relation to impose limits on gravity. However, due to the limited sample size of current data, constraints are predominantly influenced by theoretical priors. Despite this, our study demonstrates that FRBs will significantly augment the limited set of cosmological probes available, playing a critical role in providing alternative tests of feedback, cosmology, and gravity. All codes used in this work are made publically available.
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