Current and Upcoming Research
In my recent paper, I derived cosmological constraints on the matter density (Ωm) and the root-mean-square mass fluctuation (σ8) utilizing the GalWCat19 cluster catalog (Abdullah et al. 2020b; see the press release). We obtained Ωm = 0.31±0.05 and σ8 = 0.81±0.05, which are consistent and very competitive with those obtained from the Cosmic Microwave Background studies.
The matter density (Ωm): Each point represents a cluster. A point with a small size represents a small cluster with low mass, while a point with a large size represents a big cluster whit large mass. As shown, increasing the matter density results in increasing the numbers and masses of clusters in the universe.
The root-mean-square mass fluctuation (σ8): Each point represents a cluster. A point with a small size represents a small cluster with low mass, while a point with a large size represents a big cluster whit large mass. As shown, increasing the mass fluctuation (σ8) results in increasing the numbers massive clusters in the universe.