论文标题
在宇宙微波背景下区分原始磁场和通货膨胀张量的扰动
Distinguishing Primordial Magnetic Fields from Inflationary Tensor Perturbations in the Cosmic Microwave Background
论文作者
论文摘要
声称通过宇宙微波背景的B模式极化从通货膨胀中触发扰动的检测需要区分其他可能的B模式源。一种潜在的混乱来源是原始磁场。对于足够低振幅的B模式信号，微波背景温度和极化功率谱和幂律原始磁场的偏振功率光谱是无法区分的。但是，我们表明这样的磁场将诱导小规模的法拉第旋转，使用类似于微波背景的重力镜头的四点统计量可以检测到。 Faraday旋转信号将区分磁场诱导的B模式极化信号与张量扰动，以使有效的张量量表比大于0.001，在即将到来的极化实验中可检测到。
A claimed detection of cosmological tensor perturbations from inflation via B-mode polarization of the cosmic microwave background requires distinguishing other possible B-mode sources. One such potential source of confusion is primordial magnetic fields. For sufficiently low-amplitude B-mode signals, the microwave background temperature and polarization power spectra from power-law tensor perturbations and from a power-law primordial magnetic field are indistinguishable. However, we show that such a magnetic field will induce a small-scale Faraday rotation which is detectable using four-point statistics analogous to gravitational lensing of the microwave background. The Faraday rotation signal will distinguish a magnetic-field induced B-mode polarization signal from tensor perturbations for effective tensor-scalar ratios larger than 0.001, detectable in upcoming polarization experiments.
