arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.01983astro-ph.COhep-th
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探测普朗克后的原始$B$模

Detecting Primordial $B$-Modes after Planck

Paolo Creminelli, Diana López Nacir, Marko Simonović, Gabriele Trevisan, Matias Zaldarriaga

摘要:

我们更新预测的张量标量比$r$的测量各种地面实验(AdvACT,类,凯克/BICEP 3,西蒙斯阵列,SPT-3G),气球(EBEX 10 k和蜘蛛)和卫星(CMBPol,COrE和LiteBIRD),考虑到最近普朗克数据的偏振尘埃和使用组件分离方法。当至少有三个频率可用时,预测与以前的估计相比没有显着变化,前提是前景可以通过几个参数准确描述。我们认为,未来实验的理论动机的目标是$r\sim2\times10^{-3}$,这是可以实现的,如果噪声减少到$\sim1\,μ$ K-弧min和透镜减少到$10\%$的功率。我们研究的约束实验将能够把频率和$\ell$依赖的张量信号作为检查其原始起源。未来的地面和气球实验可以对这些参数有很好的约束,即使是$r\sim2\times10^{-3}$。对于相同的$r$值,卫星将勉强能够检测到重组隆起的存在,这是原始信号的最显著特征。

英文摘要:

We update the forecasts for the measurement of the tensor-to-scalar ratio $r$ for various ground-based experiments (AdvACT, CLASS, Keck/BICEP3, Simons Array, SPT-3G), balloons (EBEX 10k and Spider) and satellites (CMBPol, COrE and LiteBIRD), taking into account the recent Planck data on polarized dust and using a component separation method. The forecasts do not change significantly with respect to previous estimates when at least three frequencies are available, provided foregrounds can be accurately described by few parameters. We argue that a theoretically motivated goal for future experiments is $r\sim2\times10^{-3}$, and that this is achievable if the noise is reduced to $\sim1\,μ$K-arcmin and lensing is reduced to $10\%$ in power. We study the constraints experiments will be able to put on the frequency and $\ell$-dependence of the tensor signal as a check of its primordial origin. Futuristic ground-based and balloon experiments can have good constraints on these parameters, even for $r\sim2\times10^{-3}$. For the same value of $r$, satellites will marginally be able to detect the presence of the recombination bump, the most distinctive feature of the primordial signal.

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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