Measurement of the polarization of the cosmic microwave background
Measurement of the polarization of the cosmic microwave background
复制标题
宇宙微波背景偏振的测量
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
B. Philhour
中科院分区：
文献类型：
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作者：
B. Philhour
宇宙微波背景（CMB）偏振的测量将为描述CMB ΔT波动的模型提供强有力的检查，
早期宇宙中的密度涨落，打破解释ΔT涨落时出现的宇宙学参数之间的简并，并最终允许检测暴胀模型预测的随机引力波背景。我们描述的发展和实验室表征的测辐射热实验，旨在测量弧分尺度的偏振的CMB。Polatron接收器将安装在欧文斯谷射电天文台5.5米望远镜的卡塞格伦焦点上。接收机将测量Q和U斯托克斯参数在20%通带中心附近100 GHz，与输入极化
通过旋转双折射石英半波片在~ 1 Hz处调制信号。在六个月的观察中，我们计划在一个环中观察到约400个2.5弧分像素
在Q和U中，每个像素的精度约为5 µK，足以在当前模型预测的水平上明确检测CMB偏振。
Measurement of cosmic microwave background (CMB) polarization will provide a powerful check on the model that describes CMB ΔT fluctuations as arising from
density fluctuations in the early universe, break degeneracies between cosmological parameters that arise in interpreting ΔT fluctuations, and may ultimately allow detection of the stochastic gravity-wave background predicted by inflationary models. We describe the development and laboratory characterization of a bolometric experiment designed to measure the arcminute-scale polarization of the CMB. The Polatron receiver will be mounted at the Cassegrain focus of the 5.5 m telescope at the Owens Valley Radio Observatory. The receiver will measure both the Q and U Stokes parameters over a 20% pass-band centered near 100 GHz, with the input polarization
signal modulated at ~ 1 Hz by a rotating, birefringent, quartz half-wave plate. In six months of observation we plan to observe ~ 400 2.5 arcminute pixels in a ring
about the North Celestial Pole to a precision of ~ 5 µK per pixel in each of Q and U, adequate to unambiguously detect CMB polarization at levels predicted by current models.