Author:
Fu Hao,Lucca Matteo,Galli Silvia,Battistelli Elia S.,Hooper Deanna C.,Lesgourgues Julien,Schöneberg Nils
Abstract
Abstract
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.
Subject
Astronomy and Astrophysics
Reference70 articles.
1. Planck 2018 results. VI. Cosmological parameters;Aghanim;Astron. Astrophys.,2020
2. Spectral Distortions of the CMB as a probe of inflation, recombination, structure formation and particle physics: Astro2020 science white paper;Chluba;Bull. Am. Astron. Soc.,2019
3. The synergy between CMB spectral distortions and anisotropies;Lucca;JCAP,2020
4. The interaction of matter and radiation in a hot-model universe;Zeldovich;Astrophys. Space Sci.,1969
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献