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arXiv 1301.5779astro-ph.COgr-qchep-ph
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利用标准Sirens重建暗能量的性质

Reconstructing the Properties of Dark Energy using Standard Sirens

Maryam Arabsalmani, Varun Sahni, Tarun Deep Saini

摘要:

未来的空间引力波实验,如大爆炸天文台(BBO),将以其优良的1 sigma角分辨率,高精度地测量大量重力波源的光度距离,而单星系在与源成窄立体角时的红移将提供重力波源的红移。一个西格玛BBO光束包含实际的源只有在68%的情况下,不包含源的光束可能包含一个虚假的单一星系,导致错误识别。为了增加源落在光束内的概率,必须考虑更大的光束,从而减少在光束中找到单个星系的机会。Saini,Sethi和Sahni(2010)认为,即使识别出少量的GW源星系也会得到一个粗略的距离-红移关系,这可以用来进一步解析在角光束中有多个物体的源。在这项工作中,我们进一步发展这一想法,通过引入一个自校准的迭代方案,结合蒙特卡罗模拟,以确定光度距离GW源逐步更高的精度。这种迭代方案允许人们确定暗能量的状态方程,对于具有比BBO大一个数量级的波束宽度的重力波实验(因此具有差得多的角分辨率),其精度在百分之几以内。这是在没有来自其他数据集(如SN Ia、BAO、CMB等)的关于暗能量性质的先验信息的情况下实现的。

英文摘要:

Future space-based gravity wave experiments such as the Big Bang Observatory (BBO), with their excellent projected, one sigma angular resolution, will measure the luminosity distance to a large number of gravity wave (GW) sources to high precision, and the redshift of the single galaxies in the narrow solid angles towards the sources will provide the redshifts of the gravity wave sources. One sigma BBO beams contain the actual source only in 68 per cent cases; the beams that do not contain the source may contain a spurious single galaxy, leading to misidentification. To increase the probability of the source falling within the beam, larger beams have to be considered, decreasing the chances of finding single galaxies in the beams. Saini, Sethi and Sahni (2010) argued, largely analytically, that identifying even a small number of GW source galaxies furnishes a rough distance-redshift relation, which could be used to further resolve sources that have multiple objects in the angular beam. In this work we further develop this idea by introducing a self-calibrating iterative scheme which works in conjunction with Monte-Carlo simulations to determine the luminosity distance to GW sources with progressively greater accuracy. This iterative scheme allows one to determine the equation of state of dark energy to within an accuracy of a few percent for a gravity wave experiment possessing a beam width an order of magnitude larger than BBO (and therefore having a far poorer angular resolution). This is achieved with no prior information about the nature of dark energy from other data sets such as SN Ia, BAO, CMB etc.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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