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arXiv 1402.2498astro-ph.CO
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快速射电暴/伽马射线暴宇宙成像

Fast Radio Burst/Gamma-Ray Burst Cosmography

He Gao, Zhuo Li, Bing Zhang

摘要:

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的色散测度(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个可行的工具。我们量化的不确定性在推导红移依赖的DM_{IGM}作为一个函数的z,并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,在十年左右的时间里,可能会发现几十个FRB/GRB系统,人们可能会达到合理的约束wCDM模型。当与超新星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< DM_{IGM}(z)>和光度距离(D_{L}(z))之间的比率对暗能量模型不敏感。这给出了应用SN Ia数据来校准< DM_{IGM}(z)>的前景,使用相对小的FRB/GRB系统样本,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。

英文摘要:

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 measure (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 DM_{IGM} as a function of z, and test how well dark energy models can be constrained with Monte Carlo simulations. We show that with potentially several 10s of FRB/GRB systems detected in a decade or so, one may reach reasonable constraints on wCDM models. When combined with SN Ia data, unprecedented constraints on 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 < DM_{IGM} (z)> and luminosity distance (D_{L} (z)) is insensitive to dark energy models. This gives the prospects of applying SN Ia data to calibrate < DM_{IGM} (z)> 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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