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DOE OSTI · 3684065

Massive neutrinos and interacting dark matter look alike through the lens of lensing

Anchordoqui, Luis A. [City Univ. of New York (CUNY), NY (United States); American Museum of Natural History, New York, NY (United States)] (ORCID:0000000314637136)·Marfatia, Danny [Univ. of Hawaii at Manoa, Honolulu, HI (United States)]·Soriano, Jorge F. [City Univ. of New York (CUNY), NY (United States)] (ORCID:0000000262537378)
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Abstract

Here, we demonstrate that the suppression in the lensing power spectrum of the cosmic microwave background (CMB) caused by massive neutrinos can be mimicked by dark matter-baryon interactions at the precision of next-generation CMB experiments. Thus, a determination of neutrino masses from the CMB lensing power spectrum may be compromised. We illustrate the degeneracy for a dark matter-proton cross section ∝ $v$ –4 , which arises in the t-channel exchange of an ultralight mediator in the nonrelativistic limit.

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BibTeXRIS

Anchordoqui, Luis A. [City Univ. of New York (CUNY), NY (United States); American Museum of Natural History, New York, NY (United States)] (ORCID:0000000314637136), Marfatia, Danny [Univ. of Hawaii at Manoa, Honolulu, HI (United States)], Soriano, Jorge F. [City Univ. of New York (CUNY), NY (United States)] (ORCID:0000000262537378). 2026-05-11. Massive neutrinos and interacting dark matter look alike through the lens of lensing. https://doi.org/10.1103/r89c-jtp2

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