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The Atacama Cosmology Telescope: limits on dark matter-baryon interactions from DR4 power spectra

Li, Zack, An, Rui, Gluscevic, Vera, Boddy, Kimberly K., Bond, J. Richard, Calabrese, Erminia ORCID:, Dunkley, Jo, Gallardo, Patricio A., Guan, Yilun, Hincks, Adam, Huffenberger, Kevin M., Kosowsky, Arthur, Louis, Thibaut, Madhavacheril, Mathew S., Moodley, Kavilan, Page, Lyman A., Partridge, Bruce, Qu, Frank J., Salatino, Maria, Sherwin, Blake, Sifón, Cristóbal, Vargas, Cristian and Wollack, Edward J. 2023. The Atacama Cosmology Telescope: limits on dark matter-baryon interactions from DR4 power spectra. Journal of Cosmology and Astroparticle Physics 2023 , 046. 10.1088/1475-7516/2023/02/046

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Diverse astrophysical observations suggest the existence of cold dark matter that interacts only gravitationally with radiation and ordinary baryonic matter. Any nonzero coupling between dark matter and baryons would provide a significant step towards understanding the particle nature of dark matter. Measurements of the cosmic microwave background (CMB) provide constraints on such a coupling that complement laboratory searches. In this work we place upper limits on a variety of models for dark matter elastic scattering with protons and electrons by combining large-scale CMB data from the Planck satellite with small-scale information from Atacama Cosmology Telescope (ACT) DR4 data. In the case of velocity-independent scattering, we obtain bounds on the interaction cross section for protons that are 40% tighter than previous constraints from the CMB anisotropy. For some models with velocity-dependent scattering we find best-fitting cross sections with a 2σ deviation from zero, but these scattering models are not statistically preferred over ΛCDM in terms of model selection.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Physics and Astronomy
Additional Information: License information from Publisher: LICENSE 1: URL:, Type: cc-by
Publisher: IOP Publishing
Date of First Compliant Deposit: 23 February 2023
Date of Acceptance: 22 December 2022
Last Modified: 17 Jun 2024 13:58

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