Cold or Warm Dark Matter?: A Study of Galaxy Stellar Mass Distributions

• 作者: Bruce Hoeneisen
• 来源期刊: 天文学与天体物理学国际期刊(英文)
• 学科: 工学
• 关键词: Dark Matter Warm Dark Matter Dark Matter Properties Galaxy Stellar Mass
• 年，卷（期）: 2020,（2）
• 页码范围: 57-70
• 页数: 14页
• 分类号: TN9

摘要

We compare the observed galaxy stellar mass distributions in the redshift range <img src="Edit_bc01f6dd-d7f9-42f9-9db0-dbd1148de50e.png" alt="" />with expectations of the cold ΛCDM and warm ΛWDM dark matter models, and obtain the warm dark matter cut-off wavenumber: <img src="Edit_ab3d491d-7145-4d59-b4b1-bea473d62333.png" alt="" />. This result is in agreement with the independent measurements with spiral galaxy rotation curves, confirms that <em>k</em>_fs is due to warm dark matter free-streaming, and is consistent with the scenario of dark matter with no freeze-in and no freeze-out. Detailed properties of warm dark matter can be derived from <em>k</em>_fs. The data disfavors the ΛCDM model.