阿贝尔Higgs宇宙弦的新CMB约束
New CMB constraints for Abelian Higgs cosmic strings
摘要：
我们目前的宇宙微波背景（CMB）功率谱从最近的数值模拟的宇宙弦的阿贝尔希格斯模型，并比较它们的CMB功率谱测量普朗克。我们得到了宇宙弦张力参数$Gμ$的修正约束。例如，在$Λ$ CDM模型中，加入了弦，没有原始张量扰动，我们发现$Gμ< 2.0 \times 10^{-7}$的置信度为95%，比以前的模拟值低20%，后者的空间体积为1/64。我们调查的差异的来源，表明，主要原因是一个改进的治疗整个辐射物质过渡的字符串演化。增加的计算量也使得完全模拟物理运动方程成为可能，其中弦芯在共动坐标中收缩。这一点，以及更大的动态范围，只改变了大约10%的功率谱的幅度，表明宇宙弦的场论模拟现在已经达到了CMB计算所需的动态范围。
英文摘要：
We present cosmic microwave background (CMB) power spectra from recent numerical simulations of cosmic strings in the Abelian Higgs model and compare them to CMB power spectra measured by Planck. We obtain revised constraints on the cosmic string tension parameter $Gμ$. For example, in the $Λ$CDM model with the addition of strings and no primordial tensor perturbations, we find $Gμ< 2.0 \times 10^{-7}$ at 95% confidence, about 20% lower than the value obtained from previous simulations, which had 1/64 of the spatial volume. We investigate the source of the difference, showing that the main cause is an improved treatment of the string evolution across the radiation-matter transition. The increased computational volume also makes possible to simulate fully the physical equations of motion, in which the string cores shrink in comoving coordinates. This, and the larger dynamic range, changes the amplitude of the power spectra by only about 10%, demonstrating that field theory simulations of cosmic strings have now reached the required dynamic range for CMB calculations.
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