QUBIC Observatory: Aerial view during the inauguration Credit: MINCyT
On 23 November the QUBIC Observatory was inaugurated with great success.
Observatoire QUBIC : Vue aérienne lors de l’inauguration Crédit : MINCyT
Le 23 novembre l’Observatoire QUBIC a été inauguré avec un grand succès.

Cosmology dependence on the covariance of galaxy clusters in Rubin/LSST

The covariance of galaxy clusters is an important element when constraining cosmology with galaxy clusters. However its computation is costly in computational resources, especially when it depends on cosmology. We propose an evaluation of the impact on the cosmological parameters when the modeling of the cluster covariance is simplified. This is one of the projects for the preparation of the LSST-DESC cluster cosmology framework.

Impact of the mass function on galaxy cluster constraints for cosmology in Rubin/LSST-DESC

The abundance of galaxy clusters is a powerful probe for cosmology, especially on large-scale surveys. The goal will be to evaluate the impact of the different mass functions used for the theoretical prediction of cluster counts on the cosmological constraints. This project will be done for the preparation of the LSST-DESC cluster cosmology framework.

Dection of the Global 21cm Signal With REACH

The 21 cm HI transition offers a window onto the reionization history of the universe and the formation of the first generation of stars and quasars, when the universe was still metal poor. The global 21 cm signal consists of the non-Galactic distortion of the CMB blackbody radiation through absorption or emission by HI (atomic hydrogen) depending on whether the HI spin temperature is less or greater than the CMB temperature. Recently the EDGES experiment has detected a large signal that appears incompatible with existing theoretical models.


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