Exotic energy injection in the early Universe. II. CMB spectral distortions and constraints on light dark matter

Liu, Hongwan; Qin, Wenzer; Ridgway, Gregory W.; Slatyer, Tracy R.

doi:10.1103/physrevd.108.043531

Title: Exotic energy injection in the early Universe. II. CMB spectral distortions and constraints on light dark matter

Journal Article · 27 August 2023 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.108.043531 · OSTI ID:2419780

^[1];

^[2]; Ridgway, Gregory W. ^[2];

^[2]

New York Univ. (NYU), NY (United States); Princeton Univ., NJ (United States); OSTI
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Here, we calculate the post-recombination contribution to the cosmic microwave background (CMB) spectral distortion due to general exotic energy injections, including dark matter (DM) decaying or annihilating to Standard Model particles. Upon subtracting the background distortion that would be present even without such energy injections, we find residual distortions that are still potentially large enough to be detectable by future experiments such as PIXIE. The distortions also have a high-energy spectral feature that is a unique signature of the injection of high-energy particles. We present a calculation of the global ionization history in the presence of decaying dark matter with sub-keV masses, and also show that previous calculations of the global ionization history in the presence of energy injection are not significantly modified by these additional spectral distortions. Our improved treatment of low-energy electrons allows us to extend calculations of the CMB anisotropy constraints for decaying DM down to arbitrarily low masses. We also recast these bounds as constraints on the coupling of axionlike particles to photons.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Princeton Univ., NJ (United States)

Sponsoring Organization:: National Science Foundation (NSF); Simons Foundation; USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0007968; SC0011090; SC0012567

OSTI ID:: 2419780

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 4 Vol. 108; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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