Estimate of the Warm Dark Matter Free-Streaming Cut-Off with Isolated Dwarf Galaxies in the Local Field
- 1 Universidad San Francisco de Quito, Quito, Ecuador
Abstract
The standard cold dark matter ΛCDM cosmology model is a triumph of modern physics. However, it predicts an excess of isolated dwarf galaxies in the field. Warm dark matter is an alternative that reduces the predicted number density of dwarf galaxies. We obtain the warm dark matter free-streaming cut-off wavevector k fs from the number density of isolated dwarf galaxies in the Local Field with data of the Local Volume Database (LVDB) catalog. k fs is defined as follows: P Λ CDM ( k ) exp ( − k 2 / k fs 2 ) is the linear density power spectrum, before first galaxies, i.e. , before re-generation of small-scale perturbations, referred to the present time. We obtain k fs = 2.5 − 1.9 + 1.8 Mpc − 1 , with 68% confidence. This result is in agreement with previous measurements, but in disagreement with published limits.
- Navas, S., et al . (2024) The Review of Particle Physics. Physical Review D , 110, Article ID: 030001.
- Hoeneisen, B. (2025) The Warm Dark Matter Plus Baryon Linear Power Spectrum. International Journal of Astronomy and Astrophysics , 15, 264-281. https://doi.org/10.4236/ijaa.2025.153017
- Boyanovsky, D., de Vega, H.J. and Sanchez, N.G. (2008) Dark Matter Transfer Function: Free Streaming, Particle Statistics, and Memory of Gravitational Clustering. Physical Review D , 78, Article ID: 063546. https://doi.org/10.1103/physrevd.78.063546
- Viel, M., Lesgourgues, J., Haehnelt, M.G., Matarrese, S. and Riotto, A. (2005) Constraining Warm Dark Matter Candidates Including Sterile Neutrinos and Light Gravitinos with WMAP and the Lyman- α Forest. Physical Review D , 71, Article ID: 063534. https://doi.org/10.1103/physrevd.71.063534
- Hoeneisen, B. (2024) Measurements of the Dark Matter Mass, Temperature and Spin. International Journal of Astronomy and Astrophysics , 14, 184-202. https://doi.org/10.4236/ijaa.2024.143012
- Liu, B., Shan, H. and Zhang, J. (2024) New Galaxy UV Luminosity Constraints on Warm Dark Matter from JWST. The Astrophysical Journal , 968, Article 79. https://doi.org/10.3847/1538-4357/ad4ed8
- Hoeneisen, B. (2025) Warm Dark Matter Studies with Spiral Galaxy Data. Internat ional Journal of Astronomy and Astrophysics , 15, 336-355. https://doi.org/10.4236/ijaa.2025.154021
- Xu, K., et al . (2025) PAC in DESI. I. Galaxy Stellar Mass Function into the 10 6 M ⊙ Frontier. arXiv: 2503.01948.
- Pace, A.B. (2024) The Local Volume Database: A Library of the Observed Properties of Nearby Dwarf Galaxies and Star Clusters. arXiv: 2411.07424.
- Weinberg, S. (2008) Cosmology. Oxford University Press.
- Parimbelli, G., Scelfo, G., Giri, S.K., Schneider, A., Archidiacono, M., Camera, S., et al . (2022) Mixed Dark Matter: Matter Power Spectrum and Halo Mass Function. arXiv: 2106.04588.
- MacInnis, A. and Sehgal, N. (2024) CMB-HD as a Probe of Dark Matter on Sub-Galactic Scales. arXiv: 2405.12220.
- Despali, G., Moscardini, L., Nelson, D., Pillepich, A., Springel, V. and Vogelsberger, M. (2025) Introducing the AIDA-TNG Project: Galaxy Formation in Alternative Dark Matter Models. Astronomy & Astrophysics , 697, A213. https://doi.org/10.1051/0004-6361/202553836
- Schneider, A., Smith, R.E., Macciò, A.V. and Moore, B. (2012) Nonlinear Evolution of Cosmological Structures in Warm Dark Matter models. arXiv: 1112.0330.