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arXiv 1003.0905astro-ph.COgr-qchep-phhep-th
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CMB极化中的宇宙弦尾迹特征

A Signature of Cosmic Strings Wakes in the CMB Polarization

Rebecca J. Danos, Robert H. Brandenberger, Gil Holder

摘要:

我们计算了宇宙微波背景(CMB)极化中的宇宙弦信号。我们发现,电离后的尾流移动字符串引起额外的极化在一组矩形补丁在天空中的长度分布是标度不变的。单个补丁的长度由弦扰动CMB时的共同移动的哈勃半径决定。的偏振信号是最大的字符串唤醒产生在最早的后重组时间,并为对齐,其中光子穿过唤醒接近的时间创建的唤醒。相对于温度四极的极化的最大幅度由尾流内部的自由电子的过密度设置,其取决于尾流内部的电离分数$f$。对于高红移(接近复合)的弦和由$G μ= 10^{-7}$给出的弦张力$μ$,信号可以高达$0.06 {\rm μK}$的度标偏振。

英文摘要:

We calculate a signature of cosmic strings in the polarization of the cosmic microwave background (CMB). We find that ionization in the wakes behind moving strings gives rise to extra polarization in a set of rectangular patches in the sky whose length distribution is scale-invariant. The length of an individual patch is set by the co-moving Hubble radius at the time the string is perturbing the CMB. The polarization signal is largest for string wakes produced at the earliest post-recombination time, and for an alignment in which the photons cross the wake close to the time the wake is created. The maximal amplitude of the polarization relative to the temperature quadrupole is set by the overdensity of free electrons inside a wake which depends on the ionization fraction $f$ inside the wake. The signal can be as high as $0.06 {\rm μK}$ in degree scale polarization for a string at high redshift (near recombination) and a string tension $μ$ given by $G μ= 10^{-7}$.

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