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

摘要

We compare the observed galaxy stellar mass distributions in the redshift range with expectations of the cold ΛCDM and warm ΛWDM dark matter models, and obtain the warm dark matter cut-off wavenumber:? . This result is in agreement with the independent measurements with spiral galaxy rotation curves, confirms that k _(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 k _(fs). The data disfavors the ΛCDM model.