Year: 2026
Type: preprint
Abstract: We investigate the cosmological implications of scalar-field dark matter (SFDM) in a dynamicaldark energy framework, extending previous analyses that considered SFDM within the standardΛCDM cosmological model. We consistently implement the scenario at both the background andlinear perturbation levels. We perform Bayesian parameter inference using Planck CMB measurements, DESI DR2 baryon acoustic oscillation (BAO) data, and Pantheon+ Type Ia supernovaeto constrain the model parameter space. Our theoretical predictions show that lighter scalar-fieldmasses produce increasingly strong scale-dependent suppression of matter fluctuations and morepronounced modifications to the CMB temperature power spectrum, whereas heavier masses progressively approach the cold dark matter limit. For the SFDM mass, we obtain a one-sided 95%lower limit of log10(mϕ/eV) > −24.04 from our main joint analysis. We find that replacing the standard cold dark matter fluid with SFDM does not qualitatively alter the constraints on dynamicaldark energy or the evidence for its evolution, including a phantom crossing at low redshifts
Source: arXiv (Cornell University)
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1518877191, G613609579, G9000843778
OpenAlex ID: W7223882291