FAST RADIO BURST/GAMMA-RAY BURST COSMOGRAPHY

FAST RADIO BURST/GAMMA-RAY BURST COSMOGRAPHY
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快速无线电爆发/伽玛射线爆发宇宙学

DOI:
10.1088/0004-637x/788/2/189
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发表时间:
2014-02
影响因子:
4.9
通讯作者:
Zhang, Bing
Zhang, Bing
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gao, He;Li, Zhuo;Zhang, Bing

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最近,理论和观测证据都表明,一小部分快速射电暴(FRB)可能与伽马射线暴(GRB)有关。如果这种FRB/GRB关联系统在未来被普遍探测到,那么FRB的色散测量(DM)和GRB的红移相结合,将使这些系统成为进行宇宙学研究的一种可行的工具。我们量化的不确定性在推导红移依赖的z的函数和测试如何以及暗能量模型可以约束与蒙特卡罗模拟。我们发现,几十个FRB/GRB系统可能在十年左右的时间内检测到,wCDM模型可以达到合理的限制。当与Ia型超新星(SN Ia)数据相结合时,由于在相对高的红移下探测FRB/GRB系统的前景,可能会实现对暗能量状态方程的前所未有的约束。平均值和光度距离之间的比率(DL(z))对暗能量模型不敏感。这给出了应用SN Ia数据使用相对小的FRB/GRB系统样本进行校准的前景,允许对作为红移函数的重子不均匀性分布进行可靠的约束。如果FRB的红移可以用其他方法测量,本文提出的方法也可以应用。一些注意事项,把这种方法付诸实践进行了讨论。
Recently, both theoretical arguments and observational evidence suggested that a small fraction of fast radio bursts (FRBs) could be associated with gamma-ray bursts (GRBs). If such FRB/GRB association systems are commonly detected in the future, the combination of dispersion measures (DM) derived from FRBs and redshifts derived from GRBs makes these systems a plausible tool to conduct cosmography. We quantify uncertainties in deriving the redshift-dependent as a function of z and test how well dark energy models can be constrained with Monte Carlo simulations. We show that with several tens of FRB/GRB systems potentially detected in a decade or so, one may reach reasonable constraints on wCDM models. When combined with Type Ia supernova (SN Ia) data, unprecedented constraints on the dark energy equation of state may be achieved, thanks to the prospects of detecting FRB/GRB systems at relatively high redshifts. The ratio between the mean value and luminosity distance (DL(z)) is insensitive to dark energy models. This gives the prospect of applying SN Ia data to calibrate using a relatively small sample of FRB/GRB systems, allowing a reliable constraint on the baryon inhomogeneity distribution as a function of redshift. The methodology developed in this paper can also be applied if the FRB redshifts can be measured by other means. Some caveats of putting this method into practice are also discussed.
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