Unlocking the synergy between CMB spectral distortions and anisotropies
Unlocking the synergy between CMB spectral distortions and anisotropies
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DOI：
10.1088/1475-7516/2021/12/050
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发表时间：
2019-10
影响因子：
6.4
通讯作者：
H. Fu;Matteo Lucca;S. Galli;E. Battistelli;D. C. Hooper;J. Lesgourgues;Nils Schöneberg
中科院分区：
文献类型：
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作者：
H. Fu;Matteo Lucca;S. Galli;E. Battistelli;D. C. Hooper;J. Lesgourgues;Nils Schöneberg
宇宙微波背景(CMB)光谱失真(SDS)的测量将打开一扇了解非常早期宇宙的新窗口，提供补充从CMB温度和偏振各向异性收集的新信息。在这篇文章中，我们研究了它们的协同作用作为所考虑的实验的特征的函数。特别是，我们检查了一系列可能的SD测量的灵敏度，从Firas到噪声级别都比Pixie好1000倍，并研究了它们在结合当前或未来的CMB各向异性实验(如Planck或LiteBIRD+CMB-S4)时的约束能力。我们考虑了一些不同的宇宙学模型，例如Λ清洁发展机制，以及它随着标量光谱指数的运行，暗物质(DM)粒子的衰变或湮灭而扩展的情况。虽然即将到来的CMB各向异性实验将能够在Λ清洁发展机制的情况下将通胀参数(如as和ns)的不确定性降低约2倍，但我们发现，比Pixie(与拟议的Super-Pixie卫星相当)敏感100倍的SD实验可能进一步有助于限制这些参数。在运行标量光谱索引的情况下，这一点更加重要。此外，正如预期的那样，即使与CMB各向异性或大爆炸核合成界限相比，比Pixie差10倍的实验，对由SDS探测的红移衰变的DM粒子的约束也将改善数量级。相反，与CMB各向异性测量相比，DM湮没约束不会显著改善。最后，我们预测了可以从地面或气球上获得的灵敏度所能获得的约束。
Measurements of the cosmic microwave background (CMB) spectral distortions (SDs) will open a new window on the very early universe, providing new information complementary to that gathered from CMB temperature and polarization anisotropies. In this paper, we study their synergy as a function of the characteristics of the considered experiments. In particular, we examine a wide range of sensitivities for possible SD measurements, spanning from FIRAS up to noise levels 1000 times better than PIXIE, and study their constraining power when combined with current or future CMB anisotropy experiments such as Planck or LiteBIRD plus CMB-S4. We consider a number of different cosmological models such as the ΛCDM, as well as its extensions with the running of the scalar spectral index, the decay or the annihilation of dark matter (DM) particles. While upcoming CMB anisotropy experiments will be able to decrease the uncertainties on inflationary parameters such as As and ns by about a factor 2 in the ΛCDM case, we find that an SD experiment 100 times more sensitive than PIXIE (comparable to the proposed Super-PIXIE satellite) could potentially further contribute to constrain these parameters. This is even more significant in the case of the running of the scalar spectral index. Furthermore, as expected, constraints on DM particles decaying at redshifts probed by SDs will improve by orders of magnitude even with an experiment 10 times worse than PIXIE as compared to CMB anisotropies or Big Bang Nucleosynthesis bounds. On the contrary, DM annihilation constraints will not significantly improve over CMB anisotropy measurements. Finally, we forecast the constraints obtainable with sensitivities achievable either from the ground or from a balloon.