Cosmologie

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.

Probing Dark Energy with Galaxy Clusters: The Euclid Galaxy Cluster Catalog

The primary objective of cosmological research in the coming decade is to understand the accelerated expansion of the Universe, attributed to either a dark energy component or a modification to gravity on cosmic scales.  This thesis will focus on evaluating the Euclid galaxy cluster selection function, an essential element of using the mission’s cluster catalog as a probe of dark energy and modified gravity.  
Today eight articles prepared by the QUBIC collaboration will appear on a special issue of the “Journal of Cosmology
and Astroparticle Physics”.
Le 21 avril 2022, une édition spéciale du Journal of Cosmology and Astroparticle Physics, exclusivement consacrée à QUBIC,  avec 8 articles qui décrivent le concept instrumental.
The detectors of the QUBIC telescope presented in the video magazine Le blob.
Les détecteurs du télescope QUBIC présentés dans le magazine vidéo Le blob.

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