Title:	Cosmological constraints on mass-varying dark matter
Authors:	Chakraborty, Amlan Das, Anirban Das, Subinoy Sethi, Shiv K.
Keywords:	Cosmology Dark matter
Issue Date:	5-Mar-2025
Publisher:	Physical Review D
Citation:	Physical Review D, 2025, Vol. 111(6), AR No. 63515
Abstract:	As one of the fundamental unknowns of our Universe, the mass of dark matter remains to be a topic of great interest. We consider the possibility of a time-variation of the dark matter mass. We study the cosmological constraints on a model where the dark matter mass transitions from zero to a finite value in the early Universe. In this model, the matter power spectrum exhibits power suppression below a certain scale that depends on the epoch of transition, and the angular power spectrum of the cosmic microwave background shows a distinctive phase shift and power suppression at small scales. We use the latest cosmic microwave background data and the 𝑆8 priors from weak lensing data to place a lower limit on the transition redshift. We also find that the data from the Atacama Cosmology Telescope (ACT) show a mild preference for the mass-varying dark matter model over Λ Cold Dark Matter (Λ⁢CDM).
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/8659
ISSN:	2470-0029
Alternative Location:	http://adsabs.harvard.edu/abs/2025PhRvD.111f3515C/abstract https://doi.org/10.48550/arXiv.2405.08476 https://doi.org/10.1103/PhysRevD.111.063515?_gl=1*wq011v*_gcl_au*NDE5MDIzNDE4LjE3NjgzODAxNjE.*_ga*MjEyMjY0MTg5OS4xNzY4MzgwMTc1*_ga_ZS5V2B2DR1*czE3NjgzODAxNzQkbzEkZzEkdDE3NjgzODA1NTQkajYwJGwwJGg3ODc0ODM5NjI.
Copyright:	2025 American Physical Society
Appears in Collections:	Research Papers (A&A)

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