4.6 Article

Constraining the inflationary potential with spectral distortions

出版社

IOP Publishing Ltd
DOI: 10.1088/1475-7516/2021/03/036

关键词

inflation; cosmological parameters from CMBR; CMBR theory

资金

  1. DFG [LE 3742/4-1]
  2. F.R.S.-FNRS fellowship
  3. Probing dark matter with neutrinos ULB-ARC convention
  4. IISN convention [4.4503.15]
  5. FNRS [F.4520.19]
  6. JARA-HPC from RWTH Aachen University [jara0184]

向作者/读者索取更多资源

This paper discusses how measuring spectral distortions of the cosmic microwave background can tightly constrain different inflation models, showing the importance of the combination of SD experiments and CMB anisotropy experiments in improving constraint power. Through numerical simulations, it is found that SDs can significantly enhance constraint power and increase the figure of merit.
Measuring spectral distortions (SDs) of the cosmic microwave background (CMB) will provide new constraints on previously unexplored scales of the primordial power spectrum, allowing us to extend the probed parameter space by several orders of magnitude in k-space, which could have significant implications in the context of primordial black holes and gravitational waves, among others. Here we discuss how various models of inflation can be tightly constrained by the combination of current and future CMB SD and anisotropy experiments. In particular, we investigate the constraining power of SD experiments such as FIRAS, PIXIE, and PRISM in conjunction with CMB anisotropy probes such as Planck or CMB-S4 plus LiteBIRD. Building on the latest version of the Boltzmann solver class (v3.0), here we also consistently marginalize over the possible galactic and extra-galactic foregrounds for the SD missions. With this numerical setup, we are able to realistically forecast the improvements that the increased lever-arm provided by the addition of the various SD missions will bring for several combinations of the aforementioned experiments. As a result, in all considered models we observe that SDs provide a highly significant tightening of the constraints by up to 640%, and increase the figure of merit up to a factor of around 1600.

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